Wireless Booster

Review TP-Link TL-WN951N Wireless PCI Adapter

2011-10-30T05:21:00.001+07:00

Experience interruption-free performance and exceptional data transfer speeds with the TL-WN951N 300 Mbps Wireless-N PCI Adapter from TP-LINK. This network adapter enables you to add wireless Internet connectivity to your notebook computer or upgrade its connectivity. MIMO and SST technologies combine to deliver wireless transmission rates of up to 300 Mbps and exceptional stability.

Exceptional Performance and Stability with MIMO
The 300 Mbps Wireless-N PCI Adapter offers wireless transmission speeds of up to 300 Mbps and complies with the IEEE 802.11n standard. MIMO (Multi Input Multi Output) technology delivers improved wireless transmission rates and stability, while three detachable omnidirectional antennas are designed to provide optimal wireless performance, transmission rates, stability, and coverage.
SST technology promotes high wireless transmission performance in long-distance and high-interference environments.

Worry-Free Wireless Security
This product's QSS (Quick Secure Setup) function complies with the WPS standard to ensure the security of your wireless network. The Wireless-N PCI Adapter supports 64/128/152-bit WEP encryption, as well as WPA/WPA2 and WPA-PSK/WPA2-PSK encryption and mechanisms. These combined security measures are designed to deliver stronger, safer protection and guard against intruders.

Product and Warranty Information
The Wireless-N PCI Adapter measures 9/10 by 5-1/5 by 4-4/5 inches (H x W x D) and is supported by Windows 2000, Windows XP, Windows Vista, and Windows 7. It is compatible with 802.11b/g/n protocol wireless products as well as Intel Centrino technology.
The Wireless-N PCI Adapter is backed by a one-year warranty.

If you are interested with this wireless pci adapter, I suggest to order now through amazon.com

WiFi Cellular Phone

2011-03-21T00:51:00.003+07:00

WiFi Cellular Phone

WiFi cellular phone : Smart phone associates to the Internet with the help of WiFi connection, but them generally composition in a given range. Generally wireless support are made on the cards by little policy with the point of join your wireless router with quick Internet. Now WiFi cards are to be had in cellular phone, which report similar like individual processor by the side of to your house.

There's a apportionment modulates the availability of WiFi as skill in cell phone as skill is dramatically increases with in no time pace. The WiFi gesticulate is often used in cellular telephone, it helps the cellular phone to connect someplace WiFi acne are to be had. It's really reasonable and comfortable to join but is unsecured way to join.

All customer who uses Internet on cellphones needs high-speed Internet connection with his/her handset. Till one-year back, the marketplace was loaded with traditional instruments like EDGE, GPRS, HSUPA and HSDPA. The part from evidence are with the aim of these traditional tools didn't satisfy the food of downloading and uploading of the mobile users. With the arrival of WiFi handsets in the cellphone marketplace set up it comfortable to browse and downloading or uploading to a countless widen. The main quality of WiFi mobile is with the aim of, information could be transmitted into the WiFi enabled cellphone in the way of digital signals.

WiFi enabled mobiles additionally support MMS and divide on this handset skin texture, can stay in dash with your relatives, contacts and lineage without any calling them. WiFi enabled handsets in addition offers online browsers such as, Opera, Internet traveler, WAP and extra type of browsers.

Review Cisco Linksys E2000 Wireless-N

2011-03-14T00:45:00.002+07:00

Cisco Linksys E2000

Router Linksys E2000 with dual-band Wireless-N technology and extended range to provide wireless coverage throughout your home. Cisco associate software system aims you set up in several simple steps and offers right tools for managing your wireless network. Well custom-make your protection settings, set Parental Controls, and access advanced settings. This router is ideal for sharing your family Internet association on your house additional computers and devices.

With Gigabit Ethernet (10/100/1000 Mbps) ports on this wireless router for faster file sharing with other Gigabit-enabled devices so you can enjoy the benefits from Wireless-N technology and extended range, because you can easily connected your Internet-enabled HDTVs and Blu-ray players, computers, gaming consoles, at the same time.

Cisco Linksys E2000 backside

Also used high wireless security setting with WPA/WPA2 Personal and SPI firewall protection, and Cisco Connect's Parental Controls to block specific websites for protect your children.

If you like it, you can order now at amazon.com for ~~$94~~ just $60 and free shipping.
So check it out

Review Router Wireless Cisco E3000

2011-03-12T03:00:00.003+07:00

Cisco - linksys E3000 wireless routers are routers wireless from Cisco products that are reliable in dealing with wireless networks. By using the dual-band wireless-N router you can enjoy playing games and watching streaming HD video. Following review of the users of Cisco-linksys E3000.

Cisco Linksys E3000 backside

Cisco - linksys wireless router E3000 is one of the best products output cisco. which has the advantage of technology - Wireless-N, bands - Simultaneous 2.4 GHz and 5 GHz transmit / receive - 2 x 3, Antennas - 6 internal, x-speed Ethernet ports - 4 x Gigabit Ethernet, and much more. You can buy this router at Amazon now with very affordable price of just $ 89. Or you want to see the full specification click here

Cisco Linksys E3000

Wireless Antenna Signal Booster

2011-03-08T00:15:00.001+07:00

Today, I try to keep on my leatest posting about flat pannel antenna 18dB. Flat pannel antenna home made that I studies from website www.lan32.ru and I practice and I make it myself now that I will test-driving by link by one of ISP Wireless small-scale at my place region.With this antenna, I can get wireless signal booster.

Just begin antenna's makings flat pannel this, material that we provides for flat pannel antenna this for example:
1. Flat pannel antenna 18dB
2. Stanchion for aerial flat panel
3. Pigtail's cable flat antenna link pane by access point
4. Access point linksys wrt54GL
5. And my Toshiba notebook

Here in we try to link among transmitting aerial ISP Wireless RTRWNET- DAU and receiver antenna which is flat pannel antenna ourselves with distance is 4KM there abouts.

And its result, whew… really satisfies. We can link that network between 4 km with maximum speed 11MBps, the capturer signal around 40dBm in access point linksys. Really seems to be the capturer signal is still less lovely, but under normal circumstances mean it upon night time without marks sense interference and signal another trouble that gets we accept with force 60-65dBm.

A result that really satisfies to terminological me, only by my antenna flat pannel home-made I can link wireless's network until 4KM's distance. Maybe you are incredulous, but myself have proven it, your pleases attempt and alone point how its result, only by $10 we can make antenna pannel's flat with performa that awesome.

Ahh at least maybe I need some little rest, my eye is was beginning sleepy because last night don't get asleep to try result from wireless antenna signal booster.

Droid X | iPhone Killer

2011-03-01T22:41:00.002+07:00

I've been putting my new Droid X through its paces, and feeling sorry for my friends who have opted for an iPhone 4. Here are four reasons why X Droid better than the iPhone 4.

Big screen

The Droid X sports a 4.3 inch screen, the iPhone is 3.5 inches. That is a significant difference, and I can say that when it comes to smart phone screens, size does matter. View more content in Web pages, more video .... just more of everything. Especially useful is that with the large screen, screen keyboard is larger and easier to see and use.

Portable Hot Spot

I can turn the X Droid in a portable hot spot and take several teams Internet.True wireless access, costs an extra $ 20 a month for that service, but it's worth.
The iPhone 4 can not be a hot spot, even with her for the first time an iPhone can finally be used to bind

N Big Brother tell me what you can download

With the X Droid, I can download what you want. No Big Brother telling me that some content is politically incorrect, or you do not like a particular application, or you do not like the tools used to write a particular application. Freedom is a great thing.

On the iPhone, you can only download what Apple says you can download. The forbidding and allowing, apparently at random. Girls in bikinis are fine if they are in an application of a great brand like Sports Illustrated, but not very well if an application for a smaller developer. Political cartoonists are often prohibited --- until they win the Pulitzer Prize, and then are fine.

Swype

Swype is an ingenious alternative keyboard that enables quick pass your finger over the keyboard, the spelling of words, instead of having to touch. It is incredibly fast and amazingly accurate. It is built right on the X. S Droid is not integrated into the iPhone 4.

Three words: No tape

When I make a phone call with the X Droid, simply make the call. No tape, new case, or stops required. Can not say the same about the iPhone 4.

Wireless Assurance to Pennsylvania

2011-03-01T22:34:00.001+07:00

Census of the United States recently claimed that the percentage of Americans living in poverty increased by 14.3 percent, in 2009 - the highest poverty rate in 15 years. Additional 4 million Americans in poverty in 2009, bringing the total now to 44 million.

More than 5.5 million Pennsylvania communities currently without jobs and more than 17.5 percent live below the poverty line. Wireless guarantees the right to give the customer to call back the prospective employer, which may increase the likelihood of securing employment and provides a simple way to stay connected with family in an emergency.

"As citizens of Pennsylvania alone, I know the hard times that many in the state continue to face," said vice president for Wireless Assurance, Dave Trimble. "With unemployment challenge like that, I am very pleased that we can help our customers qualify with Assurance Wireless in Pennsylvania."

According to a survey from the Wireless Assurance, adults with incomes less than $ 25,000 are likely to use their phones to find a job as those with higher incomes.

"Programs such as Wireless Assurance is very important to help individuals and families to get back to earning" said columnist and personal finance business expert Louis Barajas.

"I was unemployed for a long time because of layoffs," said Evan M., 37, an Assurance Wireless customer from Maryland. "Free phone and service I received from Assurance Wireless is very helpful to find a new job and my efforts to recover from this recession. It allows me to contact employers who can provide a way to respond to me, while also saving the money required to provide family me. Assurance also gives me peace of mind that I have a way to stay connected with my children while away from home. "

Guarantee Wireless also provides more choice to customers for the opportunity to pay for every minute of voice and text messages to their wireless service free. Bid core remains the same: 250 minutes free talk time, free phone with the ability to buy additional minutes or text at 10 cents each. Talk Bids $ 5 increase the number of minutes available each month to 500; Talk $ 20 offers Text increase the minutes for 1000 and add 1000 text messages. It offers new features including Protector service which ensures that the basic guaranteed 250 minutes free each month a customer is eligible, even if the customer is unable to pay additional dollars for a particular month. This offer is only available to all customers Wireless Assurance.

In addition to mail2 voice and call waiting, caller ID Assurance and Wireless provides access to 911 in an emergency. Beyond 250 minutes free vote, customers can pay for domestic calls additional 10-cent-per-minute, 10-cent text, e-mail or instant messaging, international calls at competitive rates, and more.

Aruba Wireless LAN Market Aims Indonesia

2011-02-23T15:03:00.000+07:00

ARUBA Wireless LAN

Aruba Networks, 802.11n wireless LAN vendors from Sunnyvale, California, USA, began to seize their market to the internet wireless network devices in Indonesia. The company, known as the second largest supplier for the products of this enterprise-scale wireless LANs began to enter the Indonesian market with a whole range of wireless networking products for security management and branch offices.

"We see the market for Aruba products in Indonesia is moderate. Starting from the health sector, education, finance, insurance, government organizations," said Country Manager of Aruba, Indonesia and Malaysia, Kevin Wong, through its release on Monday (15/02/2010) .

Aruba offered solutions to make mobile users to access office network from anywhere they work. This solution is very economical Kevin assessed for small and medium scale industries, but still flexible enough for use even large corporations.

"One of the products launched in Indonesia, is the AP-105 802.11n access points, two waves of the compact," he said. AP-105 is expected to accelerate the use of 802.11n by offering enterprise-level security standards, the level of high throughput, streaming video support, as well as other key features.

"We believe that Aruba has managed to create differentiation for the AP-105 compared to other products that cost twice as much," he concluded.

Wireless Signal Booster for Laptops

2011-02-17T14:48:00.030+07:00

Continuing my older post about wifi range of laptop can be increasing, wireless signals are susceptible to a lot of losses of data. The topography of the place where you stay is also a deciding factor, when it comes to the wireless signal strength that you will be receiving. If a large number of trees or buildings come in between your laptop and the router you are connecting to, then your signal strength will be almost nil.

Besides everything, the wireless network cards, that come inbuilt, have very limited power and range. The answer then lies in using a wireless signal booster. A simple solution is getting a wireless card with a higher power or attaching an external USB antenna to the laptop.

There are various vendors who manufacture wireless signal boosters. These are simple devices and can simply be plugged into the USB port of your laptop. The taller the antenna of your wireless booster, the better the reception. The working of the wireless booster is pretty simple. It accepts strong signals from the router and amplifies them inside your network, thus increasing your signal strength to a great deal. For those who are interested, I am putting in a little more detailed working methodology of a wireless signal booster.

A wireless signal booster consists of two antennas - the transmitting antenna and the receiving antenna. The receiving antenna is connected to an intermediate amplifier. The other input to the intermediate amplifier is a radio signal source. The intermediate amplifier amplifies the difference between the two signals; the received signal and the radio signal, and passes it over to a low-noise amplifier. This is done to remove any unwanted signals. The low-noise amplifier is connected to the transmitter. The low-noise amplifier further amplifies the received signal and sends it to the wireless card.

The wireless signal antennas in your laptops are located internally. Generally, there are two parallel antennas located on the two sides of the LCD screen. The internal location of the wireless antennas causes bad reception of the wireless signals. So, the first problem that a wireless signal booster needs to solve, is to provide an external high gain antenna. This antenna needs to be directed to the access point.

If you don't want to spend money on buying a booster, you can simply buy a yagi antenna and integrate it to your laptop. But, before getting the antenna, you need to check the type of antenna connector that is present in your wireless card. When buying an antenna or a booster for your laptop, take care that it has a high decibel (db) range of reception.

Though, you can find out other ways for boosting up the wireless signal strength, changing your wireless network location to a position with a better access point, upgrading the router's firmware etc., all these methods are not always applicable to laptops. You may have to move over to different places with your laptop and it is not always possible for you to change the router's firmware everywhere.

The solutions that you can then rely on, in these cases, is to use a network adapter with a better power range, somewhere around 500 mw, that can be attached to your laptop through the USB port. You can also change the wireless card to one that has a strength to reach to a greater distance.

It is not always the inbuilt network card that carries the blame for your poor wireless signal reception. You may have the router placed quite near to your point of access and still may be receiving bad signals. In such cases, make it a point to put your laptop in the line of sight of the router.

The other simple, yet important factor that you need to take care of, when using a wireless connection, is that you are using a genuine broadband connection from an internet service provider. Take care that you have selected the right wireless network and you are not unknowingly stealing from someone else.

source : info

Wireless Signal Booster

2011-02-17T14:45:00.001+07:00

All wireless networks are based on radio wave transmission. That means, they also inherit all the shortcomings of radio communication which is a drop in signal strength over distances. When you setup a wireless network at home, you will realize that the range of wireless networking has inherent limitations due to internal transmitter's transmission power and physical constraints imposed by walls and roofs. There are many ways in which you can boost the strength of a WiFi network. One way of substantially boosting the signal strength of a wireless router is to get a wireless signal booster to work with it. In the rest of the article, I'll explain how wireless or WiFi signal boosters work. I'll also present reviews of some of the best wireless signal boosters that are available in the market.

You can change the location of your wireless router, buy a more powerful router, opt for a faster network standard (802.11n for example) or just opt for a WiFi signal booster offered in the market. The last option is the simplest. The following writeup will help you in understanding why it's a better choice. Get a wireless signal booster for laptop computer and enjoy better Internet speeds.

How Do Wireless Signal Boosters Work?

To understand the wireless signal boosting, you have to be familiar with the basics of radio communication. Your wireless router is essentially a radio transreceiver that modulates digital data over radio wave carrier signals and demodulates digital data transmitted by wireless devices. The range of your wireless router extends till the point where radio signals of adequate strength can be received and transmitted back. What a wireless signal booster does is the following. It receives the transmitted signal from a wireless router and retransmits it with greater signal strength than before. In this way, these booster devices can enhance the range of your router by as much as 600% or more. The greater improvement in signal strength means that the need for retransmission of data is reduced, which also boosts the data transfer speed on your network. One could also opt for wireless signal repeaters or range extenders, as well as WiFi antenna boosters. Now let us have a look at some of the best wireless signal boosters for laptops and desktop computers.

Wireless Signal Booster Reviews

Recognizing the need for boosting wireless signal strength range, most of the major wireless network component manufacturers have brought out wireless signal boosters in the market. Here is a list of some of the best products along with reviews. Make sure that the WiFi signal booster you install is compatible with your installed wireless router.

Hawking HiGain Signal Booster version 2 - HSB2
This Hawking WiFi signal booster will cost you about $59.99 on Amazon. It boosts signal transmission, as well as reception of your wireless b and g network. You can vary the power settings according to the desired WiFi access range you need. There is no need for any additional wireless signal booster software to get this product to work for you. The installation is of simple plug and play type. The company review claims a signal strength boost of up to 600%. Install it and watch your wireless network speed go through the roof.

Argtek Indoor 1W Wireless 802.11b/g Signal Booster/Amplifier w/5dBi Antenna
Designed for wireless LANs, this WiFi signal booster will cost you only $49.99. Your router must have TNC or SMA connectors for this booster device to work. It can boost the signal upto 5000 feet.

2 pack Wi-Fi Wireless Antenna / Router Signal Booster
For only $7.99, this Eforcity product can offer greater range for your home wireless network. With its plug and play facilities and easy installation, this product offers great service.

Many people have successfully used a wireless signal booster and increased the range of their wireless networks substantially. With a wider wireless network range, you also attract eavesdroppers that try hacking into your network. So make sure that you have adequate network security and encryption installed to prevent such an occurrence. Take advantage of these wireless signal boosters and extend your wireless network beyond its inherent limits!

source : info

Build Yourself Wireless Booster Helical Antenna

2011-02-17T10:08:00.001+07:00

A helical antenna is constructed from a wire that is wound to form a coil or a helix. Here's how to build one wireless booster :

1. Prepare materials and equipment needed. First get the standard cable households with diameter 12 gauge or 14 gauge. Diameter of which is not an important factor in the performance of the main antenna. However, because the antenna must be placed outside the home, he must be strong and heavy as the size of which is above. Length must be in accordance with the length of the field around the antenna. In addition, a PVC pipe with a size of 40 cm diameter and 40mm will be used to keep out the wind with a wire surounded. Other materials that must be purchased from the store is a metal mesh to the ground plate; Impedance stub consisting of a copper foil strip with a triangular-shaped dimensions 17mm and 71mm in height of a male coaxial cable, screws for the antenna to the ground plate; the end of a PVC a hat that will cover in accordance with the size of pipe, a plug cap that will be used to cover the end of the pipe, and PVC cement secukupnya. There screwdrivers, an electric drill, and soldering iron in the reach during the set up.

2. Mark the PVC pipe. On PVC pipe, across the surface pipe PVC with cable on the pipe. Make sure the coil the same distance across the surface of the PVC pipe that is 3cm. Make sure that the Helical antenna is optimized, consider to make a circle approximately 12 on the pipe.

3. Wind the wire correctly. Wrap the wiring around the PVC pipe making sure you follow the markings you previously made. Do not forget to set aside enough wiring off the end to make room for a secure attachment of the copper foil. Solder the wire end onto the narrow tip of the copper foil to join them together.

4. Do the finishing touches. With the use of an electric drill, make a hole in the end cap for the connector's attachment. Afterwards, attach the end cap onto the ground plate using screws. Put some PVC cement both on the end cap and the pipe and securely slip the pipe in. Make sure that the copper foil stub is sticking out of the end cap's drilled hole for the connector. Attach the copper foil to the connector's center pin with the use of a soldering iron. Afterwards you should screw the whole structure to the ground plate.

5. Helical antenna can be made to work with both the axial or normal mode. A helical antenna will work in normal mode when you have a dimension smaller than the actual wavelength. Meanwhile, if the dimensions of the antenna has a larger signal from the signal wavelength, it will be working in the axial mode. A spiral antenna in axial mode will be far better in performance and reliable in capturing a variety of signals as compared to the normal mode

Wireless N Portable Router

2011-02-14T13:00:00.001+07:00

This is a great router has been released by Cradlepoint. With wi-fi range from 100-200ft through walls, much greater unobstructed (variable depending on interference from other electronics and physical interference such as thick walls), and allow multiple computers to share a 3G or 4G mobile broadband connection and is ideal for traveling or installing in small places; it\'s also the most affordable wireless N mobile broadband router!

This great wireless router can supports up to 16 WiFi connections at a time, also all secure WiFi with WEP, WPA, WPA2, and AES encryption. With special offer just for $65.17 at amazon.

Wireless Network Cards

2011-02-12T16:16:00.000+07:00

If you're not a techie type person then shopping for wireless network cards is probably going to confuse you. It's true, they do all look alike and when it comes to specifications, most people don't know what they're looking for. To avoid getting muddled with so many choices of wireless cards out there, start with a set of requirements and eliminate the ones that don't satisfy them. First off, you should decide your budget when shopping for a computer network card. Obviously, since you may not know much about wireless cards, you may not know how much they cost.

Don't worry too much about this however, since decent wireless network cards can be relatively inexpensive. Next, determine what kind of adapter you need do you have a laptop or desktop? If you have a laptop then a wireless USB adapter is better suited for the job and if you have a desktop then you might want to opt for a wireless PCI adapter instead.

Most new laptops have a wireless receiver built in, so verify this before spending your cash needlessly. You can click the network connection icon in your intray and verify whether or not there is wireless capability. USB wireless adapters are perfect for those with laptops looking for portability.

Locations where you can pick up Wi-Fi signals are everywhere, meaning you can be at a cafe or at the library and access the Internet. This means that you can travel and keep in touch via email or catch up on news back home. Right now, there are over 50,000 Wi-Fi locations in the US and rising. All you need to do is turn on your wireless network card and see if it picks up a signal. Usually it can find a number of different signals in which you just pick the one that is strongest.

Even if you don't need portability at home you can still take advantage of a wireless network. For example, if you have several computers in the house and don't want to fuss with wires all over the place, then a wireless connection would be more practical. In any case, no one has the time to drill holes and install expensive wires that make the house look untidy.

With a wireless connection at home, you need not wait for the Internet to dial and you can be online in a matter of seconds. If you have a notebook, you'll be able to enjoy the advantages of portable Internet access in the garden or anywhere you please (within range that is). For desktops, installing a wireless PCI network card will give more power and range.

Take into consideration the size of your house, number of rooms and computers you have before buying a PCI adapter. Other things to consider are reliability and security. A wireless card with advanced encryption will help protect your computer data and keep your network secure. Encryption will prevent outsiders from trying to gain access to your connection without your permission. Follow these guidelines to help you get the right network card for you computer.

source : info

Why choose Wireless Cards

2011-02-12T14:13:00.001+07:00

The main reason why many choose to go wireless with their Internet access at home is because they find wires as a limiting factor. Being able to go online in any part of your house without worrying about how long your wires will reach and the likes is just an advantage that many could not resist. You can easily do this with the use of wireless routers.

A wireless router is a device that is connected to the cable of your Internet or your modem which has the capability of transmitting frequency signals to your computer so that you can access the Internet. However, this is not the only device that you need to be able to go online wireless at home. One basic requirement is for your computer to have its own wireless card. Most new laptops come with built-in wireless cards; but in case you don't have one, you can purchase a PCI wireless card or a USB wireless card. You can also use these cards with a desktop computer.

Basically, the wireless signals that come from the router will be received by the wireless cards, which will then be converted to data or protocols so you can access the Internet. There are cases wherein the wireless cards are not able to detect the wireless router, which is caused by many factors. The most common factor is compatibility issues with the version of the wireless card, the wireless router and the operating system of the computer.

The configuration of the router and the DSL modem (if you are using DSL) is another factor to check when configuring your wireless connection. If that's the case, you would need to contact your ISP and inquire what type of connection they are using to make sure that you can set up the wireless router properly.

source : info

Advantages of Using a USB Wireless Card

2011-02-11T01:30:00.000+07:00

Getting internet connectivity that is both reliable and mobile is now very easy with a USB wireless card. These wireless cards allow an individual to connect to the internet from any computer that has a USB port. The card is simply connected to the port in order to obtain wireless internet service. These cards can be purchased from many electronic retailers and telecommunication carriers and they are affordable when you consider the tremendous service they offer by making internet available anywhere at anytime. There are so many advantages to using a wireless card that can be connected to your computer via a USB port.

One of the advantages of using wireless cards that operate from a USB port is the flexibility. Unlike hardwired internet connections that require the use of cords and cables in order to connect to the internet, wireless cards are more versatile and offer mobility. Even internet connections that are setup for wireless capabilities are bound by a modem and a router. If using a laptop with a router you are limited to how far you can move from the router and the modem in order to receive a quality internet connection. Wireless cards that operate through a USB port are functional anywhere you want to connect to the internet. They can be used both inside and outside the home and they work off of high speed broadband widths so the internet connection is fast. Also, these types of wireless USB cards can be used with any electronic device that has a USB port in order to access the internet. This is very convenient and allows the individual to have internet access at any computer with a USB port.

An additional advantage of using this type of wireless card is the affordability. Whether you own a laptop, desktop or both some people prefer having the convenience of internet service provided through a wireless card. Since these cards can be inserted in any computer an individual gets more use from this card than with traditional wired internet service. Most of the cellular companies offer internet or data service plans for reasonable prices. For one low monthly payment an individual can access the internet anywhere he/she likes through the use of the wireless card operating through a USB port on any computer. Many times the wireless cards are offered as a free gift to consumers that sign up for one of the internet or data service plans. Since many people already have cellular phone service adding the data service plan to their cellular bills is affordable when you consider that the internet can be used anywhere as opposed to cable or DSL internet service. For many this internet option is just more affordable and convenient.

There are so many different types of USB wireless cards available that there should not be a problem finding a card that suits your needs. Some of these cards are even made with an antenna which can help with obtaining a good internet connection no matter where you. These cards are very useful and are recommended for those that desire internet service on demand.

Wireless Internet Cards for Laptop

2011-02-11T01:24:00.001+07:00

Long before, laptops are big, bulky and heavy. As part of the modernization, people buy these computers to conveniently take their files everywhere they want to go. As time passed, these devices became more thin, light and contains more features resulting to more uses. In today's trend, being connected to the internet at all times became a necessity. Some laptops have installed internet hardware and some don't. As an answer to the problem of not having a wireless hardware, many owners are looking for wireless internet cards for laptops.

Technically, some laptops really are designed not to contain wireless hardware for some reasons. Mostly, laptop models and brands have built-in internet capabilities. In statistics, the biggest percentage of people who want to have a laptop, also want it to be connected to the internet whenever it detects a signal. This is the luxury of having a laptop while on a business travel. Most hotels, restaurants, and public places have internet signals known today hot zones. In addition, knowing your laptop's specifications can give you exact data and idea if you really need to choose among wireless internet cards for laptops and install it on your computer.

Wireless internet for laptops are very useful today and for the years to come. The inventions right now are on a day to day basis. Internet is the biggest breakthrough in the computer era and laptops are very useful right now. The evolution of the internet is always an event to wait and having it internet capable will always be very important.

Finding the things you want maybe the hardest thing if you are not being guided by professionals, experts and skilled ones.

source : info

Wireless Cordless Headset For TV FM PC

2011-02-08T11:43:00.000+07:00

You looking for headset cordless..? Now you can have it with cheap price at amazon. Best seller Wireless Cordless Headset For TV FM and PC are ready for you just $12.49.

Best wireless cordless headset with FM Radio Receiving; Wireless Net Chatting; Wireless Monitoring, and use supply power from 2 x AAA battery, also emission distanc 7 meters. If you like it, you can have it just $12.49 at Amazon.

Linksys E2000 Dual-Band Technology

2011-02-08T01:16:00.000+07:00

Linksys E2000 is the one of best wireless router from linksys which has advantages dual band 2.4GHz and 5GHz technology, making it easier for you to enjoy wireless facilities by using only one device.

Linksys E2000 is equipped with a wireless-N which allows you to connect your device like your computer, console games, and internet HDTV also blue ray player simultaneously. By using four Gigabit Ethernet (10/100/1000 Mbps) ports for faster file sharing with other Gigabit devices.

Not only that the router is also equipped with facilities that WPA/WPA2 security to protect wireless data, and does not escape from Cisco Connect Parental Controls that can protect from certain sites.

Linksys E2000 is perfect wireless router for those who want to simplify your data traffic in the office or at home with just one tool. So do not run out and order now for only $76.99 at amazon

Build a BiQuad 3x WiFi Booster Wardriving WiFi Antenna

2011-02-06T09:14:00.002+07:00

Never built an antenna, this is a great first kit for a child or adult - easy to build in less than an hour and very powerful. The cheapest Bi-Quad WiFi antenna with 10x power increase.

This kit comes complete with a full set of instructions. The only tool needed is a butane torch or butane lighter available from any local store or gas station. This kit is exceptionally easy to construct, versatile, and with a variety of installation options. (horizontal or vertical.) The antenna is very powerful (+12 dBi or 3-4x power increase,) yet lightweight. You can also attach the antenna to a car, or mount it on the dashboard for mobile usage.

You can buy Build a BiQuad 3x WiFi Booster Wardriving for only $10 at amazon.

Wireless Hack Ebook | Securing Your Wireless

2011-02-06T00:16:00.001+07:00

The second edition of Wireless Hacks, co-authored by Rob Flickenger and Roger Weeks, brings readers more of the practical tips and tricks that made the first edition a runaway hit,

Whether you need your wireless network to extend to the edge of your desk, fit into your backpack, or cross county lines, the proven techniques in Wireless Hacks will show you how to get the coverage and functionality you're looking for.

You can buy this Ebook for only $ 2.93 at Amazon.com.

802.11g USB WiFi Wireless Lan Adapter w/5dBi Antenna

2011-01-31T10:26:00.001+07:00

The adapter works just fine with 32-bit Windows 7 - I plugged it into my trusty little netbook and it found signals I had never dreamed it would find, at far higher signal strength. But I didn't buy it for the netbook; I bought it for my desktop, which runs 64-bit Windows 7 Home Premium. Neither the drivers on the disk (the newer packages come with the Windows 7 drivers) nor drivers from RealTek work.

It especially doesn't work with the configuration software installed - and to make matters especially awesome, installing the configuration software has semi-permanently corrupted the entire networking stack on my machine, even after removing the configuration software, leading to me being unable to use the wired connection now too. I will now have to spend about $60 on an external hard drive to back up everything that needs backing up, and reinstall Windows 7 from scratch. Thanks, BlueProton!

Technical Details

* Support IEEE 802.11b and IEEE 802.11g standard
* USB 2.0 and 1.1 compliant
* High Gain 5 dBi antenna detachable
* High Transmitter Power of 22 1dBm

External Antenna USB WiFi Wireless

2011-01-31T08:18:00.002+07:00

I have installed the drivers on XP, Vista, Windows 7 and tonight on Ubuntu 10.10. In order of ease-of-install I go with Win7, Vista, Ubuntu and XP. Win7 and Vista both installed the drivers without the disk, Ubuntu seemed trickier but not really. I plugged it in, ran update manager and rebooted (Ubuntu does a full reboot on my netbook in under a minute and a half.) XP was a nightmare of picking through the mis-labeled folders on the disk, giving up and finding the drivers online.

As far as performance is concerned, I saw little signal boost on XP (went from 1 bar without to 2 bars with.) Win7 and Vista both showed a steady two bar increase (1 without to 3 with) but the most impressive was Ubuntu. On Ubuntu I went from barely 1 bar without the dongle to full signal with a rare fluctuation down to 3 bars if someone stands directly in the signal path.

I've read the other reviews and they seem pretty mixed but my opinion is that this is hands-down the best purchase under $20 I've ever made. I'm writing this review from my back patio with my Ubuntu powered Ideapad s10-3t and wireless dongle. "A computer is like an air conditioner, it works great until you open Windows."

Product Detail

Brand New Generic Product BULK PACKAGE
Specifications:Wireless LAN 11g USB Adapter, IEEE 802.11g, USB1.1/2.0, 2.4GHz-2.4835GHz
Ralink Chipset IEEE 802.11g: 6, 9, 12, 18, 25, 36, 48, 54Mbps, 5V DV
System Requirements:PC - compatible computer, CPU speed of 200MHz or above;Memory: 64MB or above, 12
How to install driver and utility: Insert the software CD to your CD-ROM, then it will auto run imme

Wi-Fi WiFi Booster Antenna for Wireless LAN CARD AP SMA

2011-01-31T06:35:00.001+07:00

I have a computer in the basement with a wireless card. the signal wasn't getting thru so i order one of these and it worked like a charm. The connector is SMA which works with practically all desktop wifi antennas that are removable. Went from a buggy 2 bar connection to a solid 4-5 bar connection with WiFi Booster Antenna.

Product Details

* NOTE: This antenna is only compatible with modems and routers with a 1/4 inch external antenna port.
* 5 X Range Extender - Extends up to 5 times the original range of your WiFi access in open space.
* Magnetic Mount - Put the antenna near the window or on top of a vehicle where it can pick up more signals.
* Plug and Play - No extra pigtails needed. Comes with 6 feet pigtail with Reverse Polarity SMA termination.
* Manufactured in ISO-9001 compliant facilities. Fully tested with HP RF network analyser.

Alfa 9dBi SMA OMNI-Directional

2011-01-31T06:18:00.001+07:00

Purchased this antenna to obtain a higher connectivity rate with your router which is a good distance away. When potential interference is removed, including power cords (as you should with any antenna), this antenna does a marvelous job. A significant boost from the stock antenna!

Replacing your WiFi antenna with This Alfa Antenna will significantly increase the range and strength of your WiFi signal. Our quality built omni-directional antenna is a direct replacement for the antenna that comes standard with your router, access point, VOIP device, or PCI card. Because it is omni-directional, no aiming is equired - it can send and receive WiFi in all directions. This Alfa antenna is stronger then the less powerful booster antennas offered by major manufacturers (Linksys HGA7S and HGA7T.) Installation is very easy - just twist off the factory antenna and twist on our Booster Antenna and you'll experience an instant jump in.

Product Details

This Antenna is original Alfa brand - the most trusted nome in network range
Fits all routers access points VOIP devices and PCI cards with an RP-SMA connection
No aiming required - Omni-directional with +9 dB gain
Replaces Factory Standard Antenna and Boosts the Range of your Router as much as 4x

High-Gain Screw-On Swivel Antenna can be used for Linksys - WET54G, WET54GS, WMP54G, WET11, WRV54G, WMP11 PCI Card, WPS11, WRT54GC also for Netgear - FM114P, FVM318, FWG114P, MA311, ME101, ME103, WG302, WG311 and WG311T.

Wireless Booster | Problem and Solution - Part 2

2010-07-04T08:29:00.000+07:00

Real Problem 4
Users too much, channels are available in 2.4 wireless antenna are too few, most or all the channels already in use (in fact only 3-4 channels interfere with each other, the others all overlapping frequency) so that interference in the tower itself was a lot.

Stupid solution :

Some customers who complained about the link try to overcome interference by installing wireless booster!

Real Solution 4
GPS capitalize we can obtain data about: the coordinates of the location customers and the distance from the tower NOC. Then make a table of contents user: name user, the degree (if shot with a compass), distance from the tower, channels who used, the allocated bandwidth. Then we make a circular diagram, with the center of the circle the Tower, making the contours of the circle to the distance, eg 1km, 2km, 3km and so on. And by using our user and map the location of the line drawn center. Use colors to distinguish different users on line which almost coincide.

Well, from this chart we can know the density of users and signal beam. Based on this chart we can take steps to action:

User the same direction as, if using a PTP can be combined into one, especially if bandwith used not too large, then it can be combined in one Access Point
Accordance no.1 if the user requires a large bandwidth and reply each PTP will continue to use channel choose a non-mutual overlapping
Accordance no.2 if using channel overlapping each other, then use polarization antennas for different PTP minimize interference.
User conflicting direction 180 degrees to avoid using the same channel / overlapping
Accordance no.4 if forced to use overlapping the antenna polarization different
Prioritize users that require large bandwidth (eg 512kbps) from interference noise channel by freeing the user to use other in the same tower.
Combine small users in one acess point, if beamnya coincide, then use grid antenna, but if beamnya wide enough then use an antenna sectoral.

Real Problem 5
One client is in trouble, from the very beginning the installation there was always a packet loss, latency big, but a good signal, but the data broken through. what the hell? because out of the way, you get the solution.

Stupid solution :
Used wireless booster pairs in the hope the problem can be resolved.

Solution Problem 5
Try to look at the client side, is there an electric field / electromagnetic big enough? whether your client with its location adjacent channel power High voltage? whether the computer monitor where your customers rock? The data will be distorted if there is good enough interference from the field electricity. let alone a radio signal, packet data through UTP cable can be damaged! Specifically for radio equipment that is placed adjacent to the electric field with high, do the following:

Grounding the tower
Use a metal box with a good reply with grounding (connected to the tower with ground)
If tower / box have a ground, the radio wrap with aluminum foil and connect with the body connector on your wifi radio.
Use STP cable (no UTP) to reduce interference on the cable
For the tower that is not ground (grounding a lightning rod, but isolated with the tower) then connect your tower to the ground. is usually tower at the shop ill-mannered grounding well. Specifically for reducing the electric field disturbance in the computer equipment in the room do the following
Install shield on the side facing the building with a voltage power cable high. Here shield-shaped cage / bars ground to stifle electric field disturbance at the building.
Use grounding in on roof, the function for shield also attention to open internet cafe / office based on IT technologies

"Avoid building directly adjacent to the High Voltage Line"

About Wireless Router

2010-04-14T05:41:00.016+07:00

Wireless Routers are physical devices that join multiple wired or wireless networks together. Technically, a wired or wireless router can also connected like access point, laptop, or PC with Layer 3 gateway, meaning that the wired/wireless router connects networks (as gateways do), and that the router operates at the network layer of the OSI model.

Home networkers often use an Internet Protocol (IP) wired or wireless router, IP being the most common OSI network layer protocol. An IP router such as a DSL or cable modem broadband router joins the home's local area network (LAN) to the wide-area network (WAN) of the Internet.

By maintaining configuration information in a piece of storage called the routing table, wired or wireless routers also have the ability to filter traffic, either incoming or outgoing, based on the IP addresses of senders and receivers.

Some routers allow the home networker to update the routing table from a Web browser interface. Broadband routers combine the functions of a router with those of a network switch and a firewall in a single unit.

Always Get Secure In Public WiFi

2010-04-03T05:45:00.000+07:00

Keeping your wireless traffic secure while you read your emails at the local coffee shop will prevent anyone sniffing your emails, or worse - your passwords. We detail the options availble for keeping your WiFi connection safe. Whenever we come across a public wireless service provided by either the local coffee shop, or the conference centre we are visiting, it's very easy to just jump right on and start using it just the same as we would if we were at home, or at work. But it's rarely safe to do so.

If the wireless is open to anyone, then usually it's not even encrypted, so anyone (with the right software) can sniff your wireless traffic straight out of the ether. Even if the wireless is encrypted you cannot guarantee the security of your connection, because if it uses a common password, it can be possible for anyone else who also knows the password to just decrypt your traffic as easy as pie.

If you use the connection to check your email, or log into your regular forum haunts (cookies may log you in automatically) then anyone sniffing your traffic, can easily pick up your user name and password, and log in as you whenever they like, allowing them easy pickings to at the least abuse your online identity, and at worst, steal your identity completely.

By taking a few precautions you can ensure the safety of your traffic, while still getting the benefit of free WiFi access.

1. Don't Forget Your Firewall

If you usually use your laptop at work or home, then it's easy to forget to check that the firewall is covering your wireless connection. Most times when setting up a firewall we just configure it to protect us on a dialup connection, and not our wireless connection, as it makes sharing files and printers easier. But as soon as you connect to an open wireless connection, are you sure you still want to be sharing all of your files with everyone else in the coffee shop? Thought not.

So before you connect, make sure your wireless connection is flagged as protected by a firewall. If you are using windows XP, just looking for the padlock on the icon for your wireless connection in the Network connections control panel, is not enough, as by default the XP firewall only protects you from internet traffic, not local traffic, so you need to secure your XP firewall. If you are using some other firewall (Norton, zonealarm etc) then make sure that the wireless connection is flagged as protected before connecting.

2. Webmail or POP

When checking your email it's easy to just start up outlook or thunderbird, and watch all the messages arrive lovely and quickly, but did you remember to check the security settings? Most email providers and ISPs don't require you to use encrypted connections to send and receive email, and some only require secure authentication to send email (as a spam prevention tactic) with no security when checking email.

This means that more often than not, unless you have turned on "secure connection" for both you outgoing and incoming email connections (which your ISP may not support) you are sending both your username, password and the contents of the emails in plain text across the wireless connection. Easy pickings for anyone sniffing your traffic.

The easiest way to ensure that all of your mail is safe, is to use your ISPs webmail as long as it supports a secure connection, and most do. This means connecting to https://webmail.yourisp.com note the https at the start, rather than the usual http. You'll need to check what the exact url is for your ISP, but do it before you wander off to the coffee shop, and add it to your bookmarks/favourites, so you don't have to remember it. Check that both when logging in to your email, and when reading your email, there is a small padlock icon on the bottom bar of your browser. If there is, then you are safe to read your email from prying eyes.

3. Cookie Crumbs

Visiting you favourite websites and forums, often you will find the site automatically remembers your name, and this is a great way for the site to prevent you from needing to log in every time you use the site. It does this using cookies - small files stored on your laptop with information (such as a login name/password or account id) that your browser passes to the site every time you visit it.

This makes your online experience much easier not having to remember login details everywhere, but unless the website is using encryption (ie https and a padlock) then anyone can read those cookies, and borrow them to log in as you as well.

This may not seem like a big deal, if you are just posting to a forum or blog, but what if you visit your favourite shopping site. If the site uses a fasttrack purchasing system, where it remembers your name, address and credit card details, then anyone capturing those cookies, may be able to start buying stuff on your credit card. Not what you want. Also is the password you use for your favourite forum different from the password you use for amazon say? Well that username and password may well be stored in your forum's cookie, which a sniffer could use as a starting point for guessing your logins to lots of other sites, especially ones that remember credit card details.

So how do you solve this, well the safest way, is to delete all your cookies before connecting to a public wireless connection. This means you won't be automatically logged in every time you visit your favourite site, but thats a small price to pay. If you use Firefox, then you can configure it to delete cookies every time you close the browser, so you don't need to remember to delete them. But think carefully before you login anywhere when using an open WiFi connection.

4. VPN Tunnels

If you use your laptop to telework from home, then you probably connect to work using a VPN tunnel. This a secure ( i.e. encrypted ) tunnel that all your traffic goes though from your home internet connection to your work's. Using this VPN tunnel, you can most likely still browse the internet, and maybe able to access your personal email account (at your own ISP).

If you do have a VPN connection, then this is the safest way of using a public wireless connection as all of your traffic, email, surfing, forum logins, shopping sites etc, will go through this encrypted connection, safe from the prying eyes of wireless sniffers.

If you don't have a work VPN, then you can relatively easily set one up on your home pc (assuming it has broadband) or with a cheap VPS. If your main pc is a laptop, then you may not have a pc left turned on at home, or a broadband connection at home for that matter, if so, try and find a friend or relative who does, who can set up a VPN for you to use.

Over the next few weeks we will be adding more articles to this topic, explaining in more detail each of the methods of keeping your traffic safe when using public WiFi

About Access Point

2010-03-28T05:36:00.008+07:00

In a wireless network, an access point sends and receives signals to any number of other, local wireless devices. These are usually adapters and routers.

An access point is different from a wireless router, in that it does not have a firewall and therefore is not appropriate to protect your local network against threats from the Internet. A basic wireless setup may not have an access point, but just a router (or a modem) and an adapter.

An access point extends the coverage within your network — it's put in a "dead spot", a place that's distant from the router, perhaps in a different room, or on a different floor.

Antenna Wi-Fi Gear with 12 Mile Range

2010-03-12T19:17:00.000+07:00

New wireless networking gear lets users log on to their service provider from 12 miles away. But the service may mean bad news for 3G, and it is here today Communications equipment maker Proxim became the latest company to sell high-powered Wi-Fi networks that travel long distances, essentially providing buyers with an "ISP in a box", the company's chief executive, Jonathan Zakin, said last week.

These versions of wireless networks using the Wi-Fi, or 802.11b, standard create a wireless zone of up to 12 miles long, far beyond the usual 300-foot-radius range that Wi-Fi typically achieves, Zakin said. Overkill for use inside a home, where most Wi-Fi networks are currently found, the long-range Wi-Fi gear from Proxim and others is meant for small Web service providers. It lets them beam long-range signals outside, particularly to sell broadband access in rural areas where DSL (digital subscriber lines) or cable broadband service haven't reached, Zakin said."..."The new technology is a further boost to the long-standing 802.11b standard, but it may come at the expense of 3G, the set of standards that have been developed for sending and receiving broadband data such as live video and CD-quality audio from compact mobile phone handsets. Mobile phone network operators have found that rolling out 3G is a pricey proposition, with European operators alone having spent 1bn euros (about £640m) on 3G licences.

Proxim, which sells a third of the world's Wi-Fi equipment, is the largest company yet to enter the market selling long-range Wi-Fi equipment. Others with uber-Wi-Fi networks include cordless-phone maker Engenius and networking companies Linksys and D-Link. These companies said they've had success peddling the gear to Web providers that are even smaller than Proxim's customers.

A bigger fish than Proxim is around the corner: Chipmaker Intel is also interested in entering the market, according to Kurt Sehnert, Intel's mobile platform group manager. Intel will likely choose to partner with someone already making the equipment, rather than develop its own, he said.

The Santa Clara, California-based chipmaking giant, which recently announced a wireless strategy, is also readying a PC card modem, code-named Calexico. The card will contain the first Wi-Fi chips made by Intel and is expected to appear in notebook computers early next year.
Proxim's gear is already being used by likes of Mile High Online in Denver, Colorado and Prairie Inet in West Des Moines, Iowa. The companies send broadband access to homes and business in their hard-to-reach areas, Zakin said.

The Proxim product can achieve long distances because the company boosted the power inside its access points -- the radios that create the network. It also added additional antennas to the access points so signals could be beamed directly to a home, rather than creating a cloud of access.
Proxim's product, priced from about ,000 to ,000 (£1,280 to £3,840), will include all the equipment necessary to become a small-scale network provider. The price differs depending on the quality of equipment and add-ons that a buyer may want. Each kit can serve about 250 customers.
By pushing Wi-Fi networks for outdoor use, Proxim and others are joining a new and growing market.

A cellular technology called w-CDMA (wideband code division multiple access) sends broadband access to rural areas, including the entire island of Maui in the Hawaiian archipelago. This technology is being used as the European standard for 3G.

Usually, w-CDMA signals travel all over, bouncing off trees or buildings. The signals themselves can get so misdirected they actually interfere with each other as they find their way to a handset or cellular base station's antenna, said Jon Hambidge, senior director of marketing for IPWireless, one of the companies that uses the technology. But IPWireless recombines the signals to decrease the usual number of dropped calls or suddenly ended Web sessions, which result from the misdirected signals, Hambidge said.

Another outdoor wireless technology vying for the rural market of Wi-Fi wireless service is MMDS (Multipoint Microwave Distribution System). Sprint PCS is using the technology to deliver broadband access to homes in the Houston area on a trial basis. Unlike Wi-Fi, MMDS uses licensed spectrum; the two technologies also use different types of modems from one another. The Sprint PCS trial is generating some interest in the technology among other Internet service providers.

There is also proprietary equipment for the market. Wireless ISP Aerie Networks of Denver uses equipment to run a high-speed wireless Web network in some areas of the country. Its patented equipment consists of radio receivers mounted to utility poles that shower an area with Internet access."

Your Needs In Printing Is Discount

2010-02-18T13:33:00.000+07:00

With discount printing, you can enjoy various benefits. As you know large quantity of printing always enjoys the lower cost per unit of print. Thus, whether you have to print a few hundred or a few thousand, discount printing on wholesale basis offers you lucrative solutions for your marketing requirements. That means, with discount printing you will enjoy the privileges of having a satisfying printing experience for the best possible price. There is a possibility that it may not be exactly the lowest, but still you can get huge benefits if you go with discount printing. Because, the large quantity of printing job always offer the lower cost per unit of print.

Sometimes, there is always doubt in customers' mind that they might have to compromise with the quality of the print jobs. But this is not the case with discount printing. Even with the cheap prices, you can get the best value for your print jobs. Discount printing is not solely concerned with economics.

It is about gaining impressive quality for your prints too. It is about prints that can fully function and perform for your needs in discount printing. As discount printing is readily available, but the point is how you can truly distinguish a printing company that will give you the savings you need from the ones that don't.

Wireless Booster | Problem and Solution - Part 1

2010-02-12T06:00:00.000+07:00

Wireless communication, especially the wifi, do not make any difference to us in touch fellow human beings in the real social life. to speak required mouth (tx power + antenna gain), to hear the ear needed (sense + rx antenna gain). The size of the mouth and ears the same size antenna with gain intensity of the sound that came out of the mouth equal to tx power sensitivity of the same poll with rx sense.

Now I want to explain the lack of wireless signal booster

Real Problem 1
==============
Many obstacles Line Of Sight so that the signal intensity accepted to be weak, stupid solution used wireless signal booster!

Real Solution 2
==============
Make a tower so that the barrier Line of Sight can minimized, so that communication can be smoothly.
Analogy : you were talking to a neighbor next door, but do not want to get out room and chose to shout from the room, if the other person you are also were in the room and choose to yell, too, does not make neighbors disturbed? angry neighbors who might have come to you while presented raw punch. would be better if you look through window and spoke with neighbors at each of the windows is not it?

Real Problem 2
==============
Wifi signal is received pretty good, but corrupted data communications, this caused interference signal is too high that's a lot of players wifi overlap, stampede, similar to the term "jamming". Solutions Stupid, used wireless signal booster! Because a stupid notion that one of the most powerful signal that he was will win.

Real Solution 2
==============
Wifi signal overlap can be minimized by changing the polarization antenna. There are four polarization antenna can be used are: vertical, horizontal, tilted 45 degrees (left) and tilted 45 degrees (right). And seek wifi channel the cleanest test memalui traffic in each channel, choose who can pass the biggest data traffic with the lowest packet loss.

Real Problem 3
==============
Hotspot users most increase (bloom) and some user from the drop signal, from the original signal strength / quality good to be accepted down 10-50%, moved to move channels did not fix the problem, users began complain, which has hotspots so stupid solution used wireless signal booster!

Real Solutions 3
==============
It is true, that as we get time and increased user will have decrease in signal strength and signal quality, but because it client is also due to the addition more users wifi. The right solution is add you sectoral antenna with 120 degrees and access point working on 1,6,11 channel. With the use of sectoral coverage will strengthen (automatic signal quality also), or start moving dedicated from the original user to be a PTP PTMP.

Continued....

Best Entertainment World from Direct TV

2010-01-07T07:24:00.000+07:00

Direct TV is one way to enter the entertainment world within one device, wherever you are. It doesn’t matter where position is to active this device. We can get and access to all the favorite channels around the world by subscribing it. Direct TV is using the transmitting from Direct Broadcast Satellite to the Digital Satellite Television and audio to its device.

Directv offers you a multiple choice to indulge yourself for the entertainment such as HD (The Best in High-Definition TV), SPORTS (Sports Channels and Packages), DVR (Digital Video Recorder Service), MOVIES (Premium Movie Channels), LOCALS (Complete Local Channels Listings), and INTERNATIONAL (From around the Globe).

You need the convenience to watch your favorites TV Channels, at Direct TV in New York for an example. And no limited access in your area. Perhaps, you may subscribe it and enjoy the Best Offers and Package available thus does not miss this opportunities occurred. For futher details of Direct TV please contact 800-378-9318, or you can visit http://mytvoptions.com.

Extending Your Wireless Network Connectivity

2010-01-05T06:18:00.001+07:00

One of the most common problems that you are likely to encounter when dealing with WiFi networks is the range of these devices. Most WiFi devices have low network strength and are purposely designed to be operated not far away from an access point. As a result, they can be a real pain to work with. Considering that the number of city wide WiFi networks has been increasing at a rapid pace and with a new hotspot being set up almost every other single day with most of them offering free internet access, a wireless network booster may be the only solution to this problem. A booster will allow you to even piggyback on a number of these networks even when you are out of range of the access points.

It is easy to know when it is time to upgrade your network and get a wireless network booster. When your downloads start to stutter or the email connection complains of a low signal, then these are signs that you need to do something. There are two lines of attack in this. One depends on your wallet while the other depends on your brain. When positioning your router, it is best when there is an actual line of sight from the transmitter to the receiver (your laptop). You can do this by placing the access point as high as you can. The antenna on the router is a low-efficient antenna and you can improve its range by upgrading to directional antennas, both for the router as well as for your laptop.

If you want a business-grade connection, then you obviously know that you will need to spend more. The good side to this is that these access points come with some of the most powerful transmitters. Matching a router and the network adapter from the same vendor will often offer better performance as well. When all else seems impractical there is one more solution; purchasing a wireless network booster. These signal boosters are usually installed together with a wireless access point and serve to increase the strength of the base station transmitter. Their main purpose is to improve both the reception and the network transmission simultaneously. A quality signal can more than triple the signal strength and offer enough coverage for a large home or office through walls. Range expanders can either be Bi-Directional Amplifiers or WiFi Signal Repeaters. Bi-Directional Amplifiers amplify the signals by about 600 percent and offer increased signal strength throughout the network. Wi-Fi Signal Boosters act as signal relay points and can be used in ‘dead zones’ to extend a network range. Whatever wireless network booster you use, it is a low cost way to greatly improve the range and signal of your access points.

What’s the wireless range booster?

2010-01-05T06:16:00.001+07:00

You have doubtless seen a number of laptop wireless booster reviews and adverts and wondered what precisely it does and how it works. The wireless booster which is a. K. A the manufactured by Wi-Ex meaning ( Wireless extenders ) is an amazing product that’s currently in the market which and significantly betters cell phone reception through wireless connectivity.

The broadband wireless booster was really easy to set up ( just connect two cables and restart your wire modem ) and needed no configuration whatsoever . The device is tiny ( 2′ X 4′ ) and weighs only an oz or so. I noticed an immediate improvement in my net connection, though there’s still a particularly slight lag. In the past several weeks I have logged virtually 3000 mins on my VoIP service and have not experienced any dropped or incomplete calls. Though it’s not that I am a gamer, the company claims it really helps with online playing also. Many people with satellite web cannot use VoIP because of the inconsistent satellite signal. If satellite Internet is your one choice for broadband, it may be worth your time to give this small device a try.

There are 2 different sorts of wireless boosters to choose between. There’s no physical link to your cellphone, may be employed by multiple phones, and all you have got to install is the antenna to the roof or window of your vehicle. You can also in use magnet mounts for straightforward installation. There are also in-building mobile phone signal wireless boosters. These wireless boosters work inside your home, building, or office. The wireless booster transmits and receives from a wireless signal inside your office or home, and doesn’t require a physical connection to your telephone. The in-building cell signal wireless booster may be employed by multiple telephones. You need to install an outside antenna and within antenna both. Both these sorts of cell telephone signal wireless boosters work very well, they are a dear investment but easily worth it.

Prepaid Credit Cards | Chistmas & New Year Solution

2009-12-22T05:08:00.000+07:00

Stay a few more days until Christmas arrives. Have you expect going on holiday anywhere? I am sure you have made plans long before Christmas. Because the holidays will makes us free from all our diseases of our work so far. Not just you, me, everyone would even need a vacation. Well .. if you had planned it you must have prepared some money for your vacation, right ? But I just reminded to remain able to maintain the financial situation we have. Not until after the holiday ends with all the pleasure and satisfaction, we are actually in the face with a more severe problem because of the inability to manage our finances. To avoid that, I had an interesting idea about Prepaid Credit Cards, which will reduces the risk in our current financial manage holidays.

As we know, we all are human beings who have a bad habit. You cannot avoid this, because I believe each of us was had a bad trait. But I am sure you are not like that. But sometimes I do not realize when I was a spender, while the holidays I do not even think how much money would spend to enjoy the holidays. But this will not happen again, because I've found the solution by using a Prepaid Credit Cards. Now I can manage even during Christmas vacation. Maybe you can try this, too. But I cannot guarantee 100% that this could help, because actually it is from ourselves. But I've got a lot of benefits from this prepaid credit card. Well ... now you prove it.

Basic Home Wireless Security

2009-12-09T03:10:00.000+07:00

Implementing Basic Wireless Security.

We’ve all done it…we’ve all seen the lack of confidence that wireless networking has brought our world. It’s a new frontier and there are open doors wherever we turn. Fewer among us are those who have actually sat down and broken an 802.11b WEP key. Though its time consuming it can be done especially when it comes to business networks administered by so wanna-be network administrators. Point being is that we know the keys can be broken. Where does leave those of us who want to enjoy the freedom of wireless? Whether its in our own networks or in municipal access nodes… we are anxious both with the data security and privacy. These are a few methods of securing a wireless network as well as securing your connection over a public wireless network.

Key Differences

One little detail to keep in mind even as your reading this post!…My suggestions on home wireless cover mostly security and ways of keeping people off of your network to begin with. If you want to open your network to all those in range you can take the majority of tips from the public wireless network section and apply them.

Home Wireless Security

The Simple Methods

ACL

ACL or an Access Control List is a characteristic that I’ve found in almost every wireless router I’ve come across. In my judgment its an obligatory security tool. I can already hear the objections of those who’ve either beaten these systems or know how to atleast in theory. ACL’s filter is based on a listed of wireless card MAC addresses. They look at the MAC address of any card that attempts to join the network and if that MAC is not found on a list of approved…MAC addresses the card and is not allowed to join the network. Surely this can be beaten by an attack his/her sniffs an approved MAC address out of the air uses a MAC Spoofer to make their MAC your own…and then join the network. Once you’re in its easy enough to knock the real user off the network…on the other hand firmly speaking you don’t have to in order for you to use the network…For a home network would be to only approve your own cards and the cards of users who are allowed to join the network. This is not a sure way to keep illegal users out however when coupled with other security methods it can be effective!!

WEP

WEP or Wired Equivalent Privacy is the strong-minded hacker’s best friend. WEP can be broken in less than eight hours. Most of you will read this and finish that its a weak encryption and unfit to secure data however… there are two points to keep in mind when considering WEP. First the network traffic must be at a peak for the attacker to imprison enough packets to break WEP and secondly it takes up to 8 hours of sniffing to capture the packets. A strong-minded attacker can be slowed by turning WEP keys weekly or for the paranoid its daily and however if you’re so paranoid…then why are you using WEP? Key rotation can only take you so far.

WPA

Many new 802.11g access points agree to use WPA (Wifi Protected Access). WPA uses a pre-shared key in arrangement to encrypt wireless transmissions. There are no tools for cracking WPA… however WPA is weak to a dictionary attack meaning that a strong-minded attacker can simply try every combination of different words and ordinary phrases until he/she breaks the key. As you can guess this is much more time consuming than automatic cracking of WEP keys. WPA is considerably more secure and if you’ve got cash and are buying a dedicated wireless router…then is suggest you choose an 802.11g router simply for the added strong point of encryption.

How WPA Works

What makes WEP weak is its Initialization Vector (IV). The IV is a 24 bit number that is joint with the key that the network administrator entered into your access point’s configuration interface. A new IV is used for each border (packet) transmitted. There are two problems with this.

1. The IV is a pseudo random number…which is not truly random and so it can be predicted within a range.

2. The IV will reprocess itself over a certain amount of time which means you have the same IV and the same key with a different payload. If an intruder collects enough of these frames that person is able to give and take your network.

WPA has been better by using a 48 bit IV which means it will be considerably longer before the IV is recycled. The second way that WPA improves over WEP is the way that users connect to a WPA enabled AP. When a user connects they are truly using a pre-shared key or in higher configurations a password from an verified server (LDAP, RADIUS, etc). Once they are made a member of this network a WPA key is created. Every so often WPA will make a new key per client which when joint with the longer IV makes WPA much harder to crack. Finally WPA uses has strengthened a technology used in WEP verification. Upon this transmission of every frame WEP added a 4 bit ICV to verify that data integrity (i.e. no injected packets, no forgeries). The problem with this is obvious because the intruder can cut off the transmission and change the payload recalculate the ICV and then retransmit…none of them would be the wiser. However WPA solves this problem with a new 8 bit MIC (message integrity code) that resides within the encrypted payload and the factors into the calculation of the ICV. It reduces the possibility of forged packets. These improvements over WEP make WPA a sound security method for any network and that is they release 802.11i.

Enjoy!

New Driver Booster Wireless Network Antenna

2009-11-12T05:39:00.001+07:00

In some cases, may sometimes we forget to update device drivers on your PC or laptop that we have, and we very frequently open Internet access, to access our email accounts, or open a facebook, though rarely we opened it to update to antivirus.

But actually we don't know, many vendors have made the latest drivers for hardware devices, and be able to improve the performance of hardware equipment. Especially for our wireless network antenna. Therefore it's good for you start trying to find out whether the vendor of the hardware device or laptop PC you have made the latest drivers that can improve the performance of your wireless network antenna.

Because I admit that after updating the drivers for wireless devices, both for the network access point and wireless card on my laptop and found the results very satisfactory. Now I do not need a signal booster antenna to catch more access points, because now my card wireless had equipped with booster signal on driver. And now my laptop wireless card can capture wireless network antenna further

Wireless Booster for your Wireless Laptop

2009-11-08T12:29:00.001+07:00

Anyway, every laptop has a different price, as well as existing features, and specifications that we get. So do not be surprised if your laptop has a wireless signal perception also lower than the more expensive laptop from your laptop.

So, whether you will be satisfied with the wireless features of your laptop? Maybe some people will say "yah" :lol:. But not for me, because we know, every corner of our city is now equipped with free hotspots, it will loose if we are not able to enjoy these free facilities for our wireless laptop factor is weak.

Then what should I do? Questions are easy, but it would be quite difficult to answer. Maybe for some people who have more money, they will visit the site amazon, or ebay, or something that like to be able to buy wireless booster or wireless PCMCIA card, a wireless power booster or wireless laptop perception will be improved. But we also know a good wireless booster must have an expensive price.

But for those of you who want to save your money for other needs, perhaps you can modify your wireless laptop. But some things you should consider before modifying the wireless laptop, make sure your wireless is in good condition and normal, and make sure that your laptop warranty period had expired. Because by modifying your wireless laptop warranty will cause your laptop is lost.

Now for those of you who intend to modify your own wireless laptop, maybe you can read some other tips on how wireless signal booster. And if you want to ask please comment below.

Kind Of Wireless Router Antenna

2009-11-05T11:59:00.000+07:00

Wireless routers are devices that you could connect your modem to and broadcast a signal which wireless devices could pick up. Wireless routers are used for laptops and sometimes used for home networks. You could take an antenna wireless for all desktop computer (in laptops, it comes with 1 built in) and just have one router can send wireless signal to all of your computers immediately. That means you don't have to care about extensive cords and wires all over your office or house.

In particular, a wireless router antenna is used to get radio waves, which are produced by the router, and converts them back to electric pulses, which the PC could translate into data.

Types of Wireless Router Antennas

Basics

There are 2 types of this type of antenna. The first type the omni-directional antenna. This could boost signal a bit higher on all directions. This would be great if you are either setting up a business where in you provide free wifi or you just want to set up the router in the middle of your office or house. You can freely utilize your wireless devices all through your home. The second type of antenna is called the directional antenna. This antenna is used to broadcast a very strong signal in a direction. Assuming you wanted to set up a business and you only utilize wireless devices on a particular side of the building. Since omni-directional antennas are not as powerful like the directional antennas (the reason for this is because they have to distribute the signal equally in all directions), you can simply set up a directional antenna anywhere in your house and point it in that direction.

Range Extender

A range extender is a directional antenna. The advantage of this type of antenna from that of the first one mentioned is that it could be applied to both omni directional and directional antennas. This antenna as well operates with the antenna that you already have. The way it works is just like a mirror. You just have to plug in your router like the usual way of setting it up. However, this time, the signal it produces would bounce-off and the range extender shoots it back out on a higher frequency. Say for instance you have a restaurant and you don’t only want to offer your customers a free wifi access, but you as well want to offer the entire surrounding of your restaurant a free wifi (for whatever reason). You could easily do that because the range extender could generally pickup signals up to 1 to 3 miles.

Evolution of Wireless Connection 4G

2009-10-30T04:22:00.000+07:00

International Mobile Telecommunications-Advanced (IMT Advanced), 4^th Generation, is the next technological strategy in the field of wireless communications. A 4G system will upgrade existing communication networks and is expected to provide a comprehensive and secure IP based solution where facilities such as voice, data and streamed multimedia will be provided to users on an "Anytime, Anywhere" basis and at much higher data rates compared to previous generations.

Features of 4G Wireless Systems

4G is being developed to accommodate the QOS and rate requirements set by forthcoming applications like wireless broadband access, Multimedia Messaging Service (MMS), video chat, mobile TV, HDTV content, Digital Video Broadcasting (DVB), minimal services like voice and data, and other services that utilize bandwidth.

A spectrally efficient system (in bits/s/Hz and bits/s/Hz/site).
High network capacity: more simultaneous users per cell.
A nominal data rate of 100 Mbit/s while the client physically moves at high speeds relative to the station, and 1 Gbit/s while client and station are in relatively fixed positions as defined by the ITU-R.
A data rate of at least 100 Mbit/s between any two points in the world.
Smooth handoff across heterogeneous networks.
Seamless connectivity and global roaming across multiple networks.
High quality of service for next generation multimedia support (real time audio, high speed data, HDTV video content, mobile TV, etc).
Interoperability with existing wireless standards.
An all IP, packet switched network.

Motivation for 4G Research Before 3G Has Not Been Deployed?

3G performance may not be sufficient to meet needs of future high-performance applications like multi-media, full-motion video, wireless teleconferencing. We need a network technology that extends 3G capacity by an order of magnitude.
There are multiple standards for 3G making it difficult to roam and interoperate across networks. we need global mobility and service portability
3G is based on primarily a wide-area concept. We need hybrid networks that utilize both wireless LAN (hot spot) concept and cell or base-station wide area network design.
We need wider bandwidth.
Researchers have come up with spectrally more efficient modulation schemes that can not be retrofitted into 3G infrastructure
We need all digital packet networks that utilize IP in its fullest form with converged voice and data capability.

Internet Speeds

2.5G is the interim solution for current 2G networks to have 3G functionality. 2.5G networks are being designed such that a smooth transition (software upgrade) to 3G can be realized.2.5G networks currently offer true data speeds up to 28kbps.
In comparison, the theoretical speed of 3G can be up to 2 Mbps, i.e., approximately 200 times faster than previous 2G networks. This added speed and throughput will make it possible to run applications such as streaming video clips. It is anticipated that 4G speeds could be as high as 100 Mbps. Thus, 4G will represent another quantum leap in mobile Internet speeds and picture quality.
4G could bring connection speeds of up to 50 times faster than 3G.

4G Applications

One of the most notable advanced applications for 4G systems is location based services. 4G location applications would be based on visualized, virtual navigation schemes that would support a remote database containing graphical representations of streets, buildings, and other physical characteristics of a large metropolitan area. This database could be accessed by a subscriber in a moving vehicle equipped with the appropriate wireless device, which would provide the platform on which would appear a virtual representation of the environment ahead.

For example, one would be able to see the internal layout of a building during an emergency rescue. This type of application is sometimes referred to as "Telegeoprocessing", which is a combination of Geographical Information Systems (GIS) and Global Positioning Systems (GPS) working in concert over a high-capacity wireless mobile system.

Telegeoprocessing over 4G networks will make it possible for the public safety community to have wireless operational functionality and specialized applications for everyday operations, as well as for crisis management.
The emergence of next generation wireless technologies will enhance the effectiveness of the existing methods used by public safety.

3G technologies and beyond could possibly bring the following new features to public safety:

Virtual navigation
As described, a remote database contains the graphical representation of streets, buildings, and physical characteristics of a large metropolis. Blocks of this database are transmitted in rapid sequence to a vehicle, where a rendering program permits the occupants to visualize the environment ahead. They may also "virtually" see the internal layout of buildings to plan an emergency rescue, or to plan to engage hostile elements hidden in the building.

Tele-medicine
A paramedic assisting a victim of a traffic accident in a remote location could access medical records (e.g.-rays) and establish a video conference so that a remotely based surgeon could provide “on-scene” assistance. In such a circumstance, the paramedic could relay the victim's vital information (recorded locally) back to the hospital in real time, for review by the surgeon.

Crisis-management applications
These arise, for example, as a result of natural disasters where the entire communications infrastructure is in disarray. In such circumstances, restoring communications
quickly is essential. With wideband wireless mobile communications, both limited and complete communications capabilities, including Internet and video services, could be set up in a matter of
hours. In comparison, it may take days or even weeks to re-establish communications capabilities when a wire line network is rendered inoperable.

Comparing Key Parameters of 4G with 3G

	3G	4G
Major Requirement Driving Architecture	dominantly voice driven - data was always add on	Converged data and voice over IP
Network Architecture	Wide area cell-based	Hybrid - Integration of Wireless LAN (WiFi, Bluetooth) and wide area
Speeds	384 Kbps to 2 Mbps	20 to 100 Mbps in mobile mode
Frequency Band	Dependent on country or continent (1800-2400 MHz)	Higher frequency bands (2-8 GHz)
Bandwidth	5-20 MHz	100 MHz (or more)
Switching Design Basis	Circuit and Packet	All digital with packetized voice
Access Technologies	W-CDMA, 1xRTT, Edge	OFDM and MC-CDMA (Multi Carrier CDMA)
Forward Error Correction	Convolutional rate 1/2, 1/3	Concatenated coding scheme
Component Design	Optimized antenna design, multi-band adapters	Smarter Antennas, software multiband and wideband radios
IP	A number of air link protocols, including IP 5.0	All IP (IP6.0)

Limitations of 4G

Although the concept of 4G communications shows much promise, there are still limitations that must be addressed.

Operating area
Although 2G networks are becoming more ubiquitous, there are still many areas not served. Rural areas and many buildings in metropolitan areas are not being served well by existing wireless networks. This limitation of today’s networks will carry over into future generations of wireless systems.
The hype that is being created by 3G networks is giving the general public unrealistic expectations of always on, always available, anywhere, anytime communications. The public must realize that although high-speed data communications will be delivered, it will not be equivalent to the wired Internet – at least not at first. If measures are not taken now to correct perception issues, when 3G and later 4G services are deployed, there may be a great deal of disappointment associated with the deployment of the technology, and perceptions could become negative. If this were to happen, neither 3G nor 4G may realize its full potential.

Cost
The equipment required to implement a next generation network is still very expensive. Carriers and providers have to plan carefully to make sure that expenses are kept realistic.
One technique currently being implemented in Asian networks is a Pay-Per-Use model
of services. This model will be difficult to implement in the United States, where the public is used to a service-for-free model (e.g., the Internet).

Conclusions

4G networks may eventually deliver on all the promises. At times, it seems that technological advances are being made on a daily basis. These advances will make high speed data/voice-over-Internet-protocol (VoIP) networks a reality.

In the meantime, it is important for industry to develop a strong 3G offering that is palatable for the general public. Equally as important, industry must ensure that expectations are realistic and that services meet and exceed those expectations.

If all goes according to what the industry envisions, it may be sooner, rather than later that we will see wireless communications evolve. This evolution will give the general public as well as the public safety community amazing functionality from the convenience of a single handheld device.

Build your own directional with antenna

2009-10-25T04:50:00.007+07:00

Everyone knows how short range WiFi can be, and how easy it is to slow down your connection speeds with interfering signals from neighbors running at the same channel or a leaky Microwave oven during dinner times.

I first tried using a wireless booster. To impress on the promise of a effective solution I acquired the most powerful 1Watt booster I could find on Ebay. Knowing that the default transmission output on most WiFi devices being in around the 0.025 Watt range, I was absolutely sure that I should be able to notice a definite increase in my range. I even tried ordering several Chinese knock-off 9dbi and 12dbi antenna's as well. I performed empirical tests with a Pocket PC and two computers in fixed positions away from each other over a extended period of time to achieve accurate results.

Antenna's:

I performed tests with the antenna's and compared signal levels achieved. I also used the stock 2dbi antenna, the 5dbi antenna which came with the booster and the 7dbi antenna from D-link. The results were quite surprising.

The 5dbi Antenna had boosted the signal slightly.

The Dlink 7dbi antenna had boosted the signal even better. Using the corded stand had a 2% signal loss on average (Not bad)

All the other non-brand name antenna's worked with a signal level comparable to or worse than the stock 2dbi antenna. It would have seemed that the knock off's were either not manufactured properly or were mismatched to the used frequencies.

Aside from the signal quality, the Chinese Knock-off's either were advertised at different gains for the same antenna's and quite often you are unable to use the antenna without the corded stand as they use a proprietary gendered connection type which is not usable with real life WiFi units. Disappointed in them I threw them out rather than trouble myself with spending time repackaging and paying to ship them back to China. So I decided to use the D-link antenna as my first choice before proceeding further as it was the "Only choice".

Boosters:

I tested the 1Watt boosters for 6 months straight. After 6 months I had all the boosters degrade to a failed mode where they actually worsened the WiFi signals. In the beginning however they did boost the range of the WiFi but only noticeable on the transmission aspect of things. The boosters work by switching between transmit mode and receive mode in a "Half-duplex" manner. It must be able to detect when the WiFi device is trying to transmit and switch into the transmit mode to do so. This usually takes time to go into the transmit mode, which they refer to as "Time Division".

That means that it can only transmit or receive at any given time plus a delay factor while switching between the two modes which slows down your capable speeds. After removing both my boosters it has increased my speeds by 3 times. If you plan on using strictly 802.3b(10Mbps) then you may not notice much degradation in speed, but you sure do notice it dragging it's feet at 54Mbps or higher speeds. Anyone trying to extend WiFi range with these boosters "MUST" use boosters at both ends of the WiFi. It will not work simply having one booster at the source as it only significantly amplifies the transmissions.

You may be able to see the boosted signal two blocks away, but you will never be able to connect to it without boosting your signal as well. Nevertheless, my boosters are garbage now. If you plan on going this route, you will find your costs of expanding your range to be expensive and only partly reliable. I would suggest buying a model of booster which has a brand name on it and a time division capable of keeping up with the fast 802.3G/N WiFi devices made today. I abandoned the use of them entirely as a result of my failures to get it to work well enough.

USB WiFi devices are sorta so-so because the Ethernet WiFi devices can be used at the end of a really long cable, where you are limited with length using USB. You also can use Ethernet WiFi devices when connected to networks (Between routers, or joining networks with one router and multiple access points and multiple switches.. In general you have more flexibility and compatibility when using Ethernet WiFi equipment. I don't understand why USB is so popular despite it's limitations.

PCI cards are a joke as well as most of them are behind your computer with a fixed antenna in poor locations offering little to no benefit at all over Ethernet devices. However PCI cards sometimes offer you a more comprehensive control over reporting more WiFi details than your USB devices. Again, you need a wireless device for every computer you have as you cannot share the connection easily in a network.

Routers are sometimes equipped with two to three antenna's. Having to use Parabolic reflectors with multiple antenna's is not only difficult but also expensive as you need to double to triple the cost of extending your range by use of boosters or reflectors. Doesn't make sense to me having anything equipped with more than 1 antenna.

Ranges with WiFi is so "Near" that it is easier to drag a Ethernet cord between my computers which are close enough to do so. Having to introduce latencies, intermittent service outages due to interferences, security holes with WEP/WAP AND increasing the hardware requirements and costs in actually using WiFi at reasonable distances is in most cases easier to simply run a cable.

Ethernet Access Points often are toted around by D-link and Linksys as being just that Access points. Be very careful with what you buy as these manufacturers quite often lure you into thinking that you will be able to use the AP to connect to your router. They often play with terms like Access Point or Bridge Mode WiFi and strip out all the features out like being able to do site surveys, repeater mode with client association, multiple bridge mode (Link multiple routers), or allow using a DHCP server. I have yet to find a WiFi device that I liked.

Closest thing I could find that would give me some signal levels and options was a Netgear WG602 Access point. However that unit has some nasty firmware bugs and 4 hours over the phone with Netgear support tells me that they are not willing to admit it or incapable of understanding why. Buy these units only if they are inexpensive enough to compensate from the troubleshooting time of hardware resetting them every time you change a setting in the wrong order.

Overall Ethernet Devices are the best because you can hook them up to the end of a inexpensive and up to 100 foot length of cable. Repositioning these devices to the ideal location is a snap and networking them to multiple computers is a no-brainer. As such is in my opinion Ethernet is the ideal choice.

Booster Directional Antenna with USB Wireless Booster

2009-10-23T17:25:00.001+07:00

Everyone knows how short range WiFi can be, and how easy it is to slow down your connection speeds with interfering signals from neighbors running at the same channel or a leaky Microwave oven during dinner times.

I first tried using a WiFi Booster. To impress on the promise of a effective solution I acquired the most powerful 1Watt booster I could find on Ebay. Knowing that the default transmission output on most WiFi devices being in around the 0.025 Watt range, I was absolutely sure that I should be able to notice a definite increase in my range. I even tried ordering several Chinese knock-off 9dbi and 12dbi antenna's as well. I performed empirical tests with a Pocket PC and two computers in fixed positions away from each other over a extended period of time to achieve accurate results.

Antenna's:

I performed tests with the antenna's and compared signal levels achieved. I also used the stock 2dbi antenna, the 5dbi antenna which came with the booster and the 7dbi antenna from D-link. The results were quite surprising.

The 5dbi Antenna had boosted the signal slightly.

The Dlink 7dbi antenna had boosted the signal even better. Using the corded stand had a 2% signal loss on average (Not bad)

All the other non-brand name antenna's worked with a signal level comparable to or worse than the stock 2dbi antenna. It would have seemed that the knock off's were either not manufactured properly or were mismatched to the used frequencies. Aside from the signal quality, the Chinese Knock-off's either were advertised at different gains for the same antenna's and quite often you are unable to use the antenna without the corded stand as they use a proprietary gendered connection type which is not usable with real life WiFi units. Disappointed in them I threw them out rather than trouble myself with spending time repackaging and paying to ship them back to China. So I decided to use the D-link antenna as my first choice before proceeding further as it was the "Only choice".

Boosters:

Routers are sometimes equipped with two to three antenna's. Having to use Parabolic reflectors with multiple antenna's is not only difficult but also expensive as you need to double to triple the cost of extending your range by use of boosters or reflectors. Doesn't make sense to me having anything equipped with more than 1 antenna. Ranges with WiFi is so "Near" that it is easier to drag a Ethernet cord between my computers which are close enough to do so. Having to introduce latencies, intermittent service outages due to interferences, security holes with WEP/WAP AND increasing the hardware requirements and costs in actually using WiFi at reasonable distances is in most cases easier to simply run a cable.

New Antenna Technology Promises Booster Speeds

2009-10-17T13:16:00.000+07:00

New MIMO-type antennas, developed by Alcatel-Lucent, have been used in live field trials to demonstrate much improved uplink performance regardless of whether the user was close to the centre of an LTE cell or at its outer edge. The tests took place in Berlin, Germany, with the cooperation of Deutsche Telekom Labs, the Fraunhofer Heinrich-Hertz Institut, and antenna supplier Kathrein.

The technology under test--Coordinated Multipoint Transmission (CoMP)--was said by Alca-Lu to take advantage of MIMO (Multiple Input-Multiple Output) techniques pioneered by Bell Labs, now part of Alca-Lu. The company said that uplink data rates faster than 5Mbps were observed for the vast majority of locations even at the edges of the LTE cell.

Those involved with the tests said that the configuration differed from that of basic MIMO with CoMP interconnecting antennas deployed at a number of sites that were in proximity to one another.

The test conditions saw transmissions from the mobile devices being received by two active remote radio heads deployed on two buildings located 500m from one another, then forwarded across an optical fibre link to a central unit comprising the modem and controller elements of an Alca-Lu LTE base station (eNodeB). The signals were then combined with one another to increase the strength of the signal. The tight coordination of the transmission and reception of signals at these multiple access points was said to reduce interference.

"The results we have achieved with this new transmission technology are built on our world-leading multi-antenna wireless research," said Gee Rittenhouse, head of Bell Labs Research. "In the future as LTE networks become widely deployed we expect that CoMP will help enable our customers to meet the next wave of demand from users who expect to access all sorts of exciting high-bandwidth applications with their mobile phones."

Intrusion Detection Guide Wireless Network

2009-10-12T19:27:00.000+07:00

With growing used of internet the threats attached to it are also growing. As more as many people are getting dependent on internet, hackers are inventing new ways to intrude into their systems and cause havoc for them. By intruding or by gaining unauthorized access to their computers, hackers can access confidential information or can simply destroy their system and derive sadistic pleasure out of it. Thus, Intrusion Detection Systems (IDS) have become need of the hour.

The large number of computers accessing internet and valuable information they contain has made it quintessential task to ensure wireless network security before establishing any kind of wireless network. Hackers can adopt different methods to breach wireless network security. Most common of them is by gaining unauthorized access to get information that is primarily private and confidential. This is very dangerous for a wireless network as this information can be misused or can be modified by hacker, which is also known as data diddling. This kind of modification of data can render all data stored on computers that are connected to a wireless network, to become useless. Thus, it can result in total chaos and disorder for any organization or individual. Some hackers may even delete data totally or may release a virus in wireless network that can corrupt all files on computers including those of the operating system, which can render a computer to be totally useless. Some other forms of wireless network security threats are remote login capability, SMTP hijacking, DNS, Macros and OS bugs.

Because of these multiplying threats, Intrusion Detection Systems are gaining popularity and have become an integral part of the overall business strategy of an enterprise. The main purpose of an Intrusion Detection System is to identify any passive or active and any internal or external activity that is hostile to a wireless network and then to alert the concerned system administrator and also block it as it happens. Thus, it detects any unauthorized access or misuse of a computer system and acts like a burglar alarm for a computer. Eventually many different Intrusion Detection Systems have been developed, however, detection schemes generally fall into one of two categories, anomaly detection or misuse detection. Anomaly detectors sort out the behavior that deviates from the normal system use. While on the other hand, misuse detectors look for behavior that matches a known attack scenario. Another sub-category of Intrusion Detection Systems is wireless network Intrusion Detection Systems (NIDS). These systems look out for suspicious activity and monitor the packets. wireless network Intrusion Detection Systems can monitor many computers at a time over a wireless network, while other intrusion detection systems may monitor only one.

Usually it is assumed that people outside the wireless networks try to break into them and gain access to private and confidential information. However, the truth may be different for a big corporate houses. Here, insiders pose a greater threat to the information and overall security of wireless network. This is because they have insider’s knowledge of workings of company.

Hence, though wireless network security threats are multiplying with size of wireless network, we can still secure our wireless networks by acting judiciously and by having the necessary Intrusion Detection Systems on our wireless networks.

Features of Wireless Security Camera

2009-10-06T00:53:00.000+07:00

Would you like to know of a product that offers remote access to any live streaming video from any part of the world to business owners? A Wireless Internet Security camera does just that. It will allow business owners to view a video file of California sitting on a plane to Tokyo. And for all this, the minimum requirements are – A Web Browser and of course a Wireless Internet Security Camera.

What are the features of a Wireless Internet Security Camera?

• Connectivity – The Wireless Internet Security Camera offered by many companies connects to a wireless network or a wired Ethernet network. It allows the business owners to download and upload video streams up to 30 frames a second. The resolution offered by this technology uses the MPEG-4 compression technique to provide the video with a 640*480 video resolution.

• Charge Couple Device – Should you wish to capture images in low light (example dark room or images take in the night), you can do that using a Wireless Internet Security Camera which uses the CCD (Charge Couple Device Technology). This allows you to provide very clear and crisp video of images shot in night/low light. Ask any professional photographer as to which shots will the be the most difficult ones to capture on camera and he would say "The shots taken in low light". The Wireless Security Camera gets rid of this thought as well.

• Video Monitoring System can be setup remotely – Now, business owners can look at setting up a powerful video monitoring system over the internet from remote locations. Let us take an example assuming that your business site is in NY city. Your site has about 10 cameras installed in it which does the surveillance of the activities on your site. When you are on a business trip to lets say, Singapore, you wish to see what is happening at your site. You can do that with consummate ease with a Wireless Internet Security Camera.

• Dynamic Domain Name Service – The Internet camera allows business owners to integrate the web server, emails and IP addresses to itself which will allow you to view the streaming video from the camera’s unique IP address. The fact that you would be able to provide a personal web address allows users to access the camera’s live video over the internet.

• Pan and Tilt – Now, your Internet Security Camera will allow you to adjust the camera angles. That is achieved by the Motorized Pan and Tilt functions which allows you to remote control the angle positioning of the cameras. And if by viewing the video stream, you decide to zoom in on the video, you can do so without any hassles. The Wireless Internet Security Camera allows you to do that by its built in 4X Zoom technology.

The Wireless Internet Security Camera is proving to be a device which allows the business owners to be in constant touch with the goings-on of a business. It is a bit expensive, but indeed a small price to pay for the benefits and features it offers.

With WiFi Networking

2009-09-26T10:49:00.001+07:00

A new aspect in networking

WiFi has brought a new aspect in the ground of networking. The broadcast of data is completed via radio waves and the cost of cables for network lying down.Wi-Fi enable a user to get access to internet anywhere in the given location. Now you can make a network in Hotels, Libraries, colleges, universities, campus, private institutes, and coffee shops and even on a public place to make your business more profitable and connect with their client any time. WiFi makes waves for business with their highly effective cable less media.

Unmatched mobility and elasticity

Wi-Fi, is allowing new intensity of connectivity without giving up functions. Wi-Fi introduced various types of utilities such music streamers that transmit your music to speakers without any wire you can also play music from the remote computer or any other attached to the network. The most important now you can play online radio. Wifi technology system is rather remarkable, you can download songs, send email and transfer files expediently at sky-scraping speed and you can move your computer easily because your WiFi network has no cable to disrupt your work so we can say that it is quite easy, helpful and most of all expedient.

Fortress Technology

WiFi providing secure wireless solutions support the growth and release of a prototype mobile ad hoc wireless network for use in the wireless strategic skirmish.

Support an entire age bracket.

WiFi technology has several advantages it support an entire age bracket and create a connection between components on the same network and have ability to transfer data between the devices and enable different kind of devices such as game, MP3 player, PDA's and much more!

It's convenient and every where

WiFi is a convenient technology and where the range station exists you are online during travel you can equip with a Wi-Fi network and set up shop anyplace. You will automatically connect with internet if you are near hotspot. These days WiFi exist every where with all its wonders.

More faster and secure

With WiFi you can get high speed of internet because it is very fast than DSL and Cable connection you can establish a Wifi network in small space now you don't need any professional installation just connect to a power outlet with an Ethernet cord, and start browsing. WiFi security system for Threats makes it more renewable and its tool protect your VPN and secure web page. You can easily configure the device to take better performance. The standard devices, embedded systems and network security make it more powerful

WiFi with no limitation

You can use a "WiFi" network with no limitation because it can connect you worldwide. You can easily reach to your requirements with WiFi networking applications because the power consumption is very high as compared to other bandwidth. The vision of wireless network is bright with Pre-N products and high qulaity media streaming.Further details are available on Wifi

Basic Selection Antenna for Wireless Networking

2009-09-16T10:44:00.001+07:00

The wireless coverage cell on inside deployments can be extended with external antennas that plug into connectors on the access points. Most antennas can be mounted on the ceiling or wall and outside antennas often use a mast to increase height for line of sight.

Effective Isotropic Radiated Power = Transmit Power (dBm) + Gain (dB) - Cable Loss (dB)

Omni-Directional

Omni-directional antenna sends a horizontal radiated pattern of 360 degrees and a vertical pattern of 50 - 70 degrees from its source. From a practical perspective the pattern isn't circular as much as being elliptical. It is a multi-homing antenna that sends signals to several clients in proximity causing some multipath fading that is minimized with antenna diversity. The gain values with 2.4 GHz antenna range from 2.2 dBi - 12 dBi. The higher gain antenna is deployed outside for the most part. Some Cisco access points have an integrated omni-directional dipole antenna or " rubber ducky" that is standard with each device.

Directional

The directional antenna sends out a directed radiated pattern connecting with a distant antenna. The antenna purpose is to send traffic between antennas and not used for multi device homing. There are 3 specific directional antennas: Yagi, Patch and Dish. The Dish antenna has highest gain and narrowest radiation angle beam while Patch antenna has lowest gain and widest radiated beam. Gain values with 2.4 GHz antennas range from 6dBi - 21 dBi. Most antenna from this group are implemented in buildings with there is a lot of signal attenuation such as manufacturing, warehouses, and structures with a lot of steel, concrete, angled designs etc.

Diversity
The diversity antenna implement dual antenna on the access point receiving signals on both. The access point determines what antenna has best gain and transmits on that antenna. Diversity antennas are designed using either omni-directional, directional or dipole styles. Multipath fading occurs in buildings that have a lot of signal reflection. The signal finds multiple paths from source to destination and signal becomes distorted at receiver. This is minimized or eliminated with diversity antennas.

External Antenna

Some Cisco access points such as 1200 series have connectors available for an external antenna. This is available with deployments in environments where the access point is at a maximum 300 feet from the wired switch or signal distortion is excessive. The external antenna with a specified coax cable of 3 - 100 feet allow for placement of the antenna at optimal positioning. Minimizing the cable length will decrease signal attenuation before transmission. Implementing the higher gain diversity patch antenna fixes the problem of clients being out of range. The company could have deployed a repeater as an alternative solution with an 1100 series access point that doesn't support an external antenna.

Building material and structural design will contribute to signal attenuation. The following describes from best to worst building material used with walls, floors and ceilings. Steel and concrete with several feet of construction is most difficult.

• Wood
• Concrete
• Reinforced Concrete
• Steel

Extended Antenna, Wireless Booster Modem Sierra 885U

2009-09-02T06:45:00.001+07:00

Did you know that your Modem HSDPA Sierra 885U have slot for external antenna? Look at the picture below, the figure below shows the location of an external antenna slot for Sierra 885U modem. That will be wireless booster for modem output from AT&T has a complete feature for a HSDPA modem, because the modem is already equipped with a slot for Micro SD MMS and this modem has an external antenna slot is useful if you do not get a good 3G signal.

Image upper are picture of Sierra 885U modem is mine above the monitor complete with an additional antenna to strengthen the 3G signal.

Making additional antenna is quite simple, the materials you need to do is solder and tin, and the materials you need to have a male jack to your television antenna, and cable television antenna with a diameter 1cm. Manufacture is also very easy, first peel the skin from the cable antenna, there are two cables inside, fiber cables are used for grounding, and a single cable is used to radiate. The second stage, after the cable peeled, soldered fiber cable or grounding to the body of a male coaxial TV antenna. Glue with a strong lead, and then input the single cable and attach to the modem.

Now HSDPA modem you have additional antenna to strengthen the 3G signal.

Understanding Wireless Antenna

2009-08-26T08:26:00.001+07:00

Modifying antenna for Network Wi-Fi actually is so too easy for me, why am I say such, previously lets we few the past. Antenna who is utilized divides client usually is antenna parabolic one why such, since antenna parabolic have radiation or bounce pattern as big as 90 - 120 degrees. So wireless sinyal radiation or wave of that antenna gets to reach distance that adequately goes away.

Any other thing on wireless signal transmitting that used sektoral antenna or antenna omni, that have signal sector energy as big as 180 - 360 degrees. So wireless signal that is emitted not necessarily again is led to client.

Therefore studies and understand that on needed receiver part is parabola antenna be not sektoral or antenna omni, there are many person which look on that thing is good, up to they external antenna, therefore they look on that thing are ordinary.

For example, often I see someone play internet at public place commoning to use notebook with additional external omni that relative. With that expectation by use of antenna external it can get best wireless signal.

That thing I say adverse, since it lovely crossbeam if it makes / modify that laptop's antenna alone as antenna which have vicinity polarization 90 - 120 degrees as tin cantenna. And stays behind to be presented at by that wireless transmitting get Wi Fi's signal the better again.

So which antenna that good for client, and which antenna that lovely for transmitter.
For better Network Wi-Fi.

Simple 3 Step Setup Wireless Networking

2009-08-26T05:44:00.000+07:00

Wireless Networking Made Simple 3 Easy Steps configuration Even beginners can master :

1. Plan your system - before you dive into the world of wireless technology, know what lies ahead. Conduct a comprehensive needs analysis of your network, you need to do, and what they expect to obtain a reasonable return on their investment. Evaluation of the network, determine how many jobs need to connect and can best be used. Furthermore, updating the inventory should provide the existing hardware and decide what equipment to purchase.

These types of devices needed for your wireless network:

Wireless Access Point - is a "controller" of your wireless network.
There are two types of access points - physical access point and the "integrated" access points. The access points of material is used as an extension of existing wired network. Integrated access "refers also provide the functionality of the router connected to broadband (ie, points of DSL or cable modem. In the general case may be, at least 50 users exceeding the connection limits is often a problem.

Remember that when you network connection is common to all active users. Birth of the Child, 11, 22, 72, 108 Mbps Network Connection Internet connection not "quick", but it lets you quickly transfer data among users of a wireless network. So, if you decide to create a duplicate of the files from computer to computer room, lounge, or watch a video, recorded in his living room computer, transfer speed data is large. Cruising on the Internet, you can see lower access to high speed Internet, if your son downloading MP3 files in your room and try to watch videos online. the speed of your wireless connection will vary depending on its location (for example, in the pool against the total number of access points), however, proper placement of the access point can help provide the best service to all areas you plan to use a wireless connection. We carry a wide range of access points, wireless communications, including combining multiple ports Wired hub so you can use one device for wired and wireless communications.

PCMCIA Wireless Adapter - This is usually used for laptops.
The PCMCIA card simply plugs into a laptop PC card slot, and after the configuration software supplied with the card, it detects the network connection. Some access points allow you to configure security so that "allowed" cards are provided access. This will alleviate the problem, if your neighbor decides to go to their web site once they see that you are using the Internet in your pool. PC can connect to a wireless PCMCIA adapter PCI low cost, allowing a quick and easy connection of desktop computer using an internal adapter, a PCMCIA card that slides.

Compact Flash wireless network adapters
If you have a portable device that includes a CF Type II slot, you can connect to a wireless network adapter with Compact Flash Wireless Network.

Wireless USB Adapter - Ideal for use with desktop computers
USB wireless adapter lets you connect your system to a wireless network without installing any card or open a computer at all. They are convenient and easy to add wireless to an existing PC in your home. Furthermore, based on user feedback, an external USB device has better reception than the internal PCMCIA card in the back of your computer you can move it for better reception.

Wired and Wireless Together - You can build a network of integrated access points, wired and wireless. Why do you want? Well, you can wire to run the system at home. Lower cost than a computer (Ethernet NIC manages approximately $ 10.00 and cable in the range of U.S. $ 5-10) and you can easily access through cable. There are many devices in mixed mode, or bridges is available. For our full range of integrated access points. This device lets you connect to broadband internet (via WAN) and up to three devices, cable (Ethernet port) and 253 devices through one point of wireless access, integrated unit. This should be a standard PC connected roaming laptops and other devices where wiring is simply not possible.

In the end, to run a network in your home or office is not too difficult! Choose the right part of the network Puzzle and get the best rates available. They will work together, and you make better use of resources

2. System Settings - Now that you have in place a plan that spells out what their equipment needs, how to configure the network and what are the objectives you hope to accomplish with wireless technology, time to install your network. Before taking this step (do not worry, it's much easier than it sounds) should develop an understanding of teamwork involved in the wireless network. LAN Wireless LAN equipment consists of wireless clients - laptops, printers and portable devices that can communicate via wireless local area networks - and access points, which are the points that accept the wireless radio signals connected. Your gateway is the central point of contact for their computers. Now is the time to build a wireless network! Again, do not worry - you will be surprised how easy it is. This is what you should do:

How many people use the network
you can see how many access points that you need. Select the city center to the local network connection. If possible, should be in an open environment, with a maximum wireless coverage. Walls, cables, pipes, etc. the existing environment can undermine their status.

Configuring a wireless network to work with the network.
Check your setup before you live. With reference to test software, you can determine what percentage of the data is transferred correctly, how long will it take to receive a response from the recipient device, and the forces of signal transmission. Develop a protocol for managing a wireless LAN.

3. Implement security measures to protect the integrity of your wireless network - Remember that wireless is transmitted in the air and is unable to close. Therefore, maintaining the security of your system requires measures that are specific to mobile. Security solutions include Wireless Media Access Control (MAC), WEP encryption and Traditional VPN (Virtual Private Network) securities controls. Below is a brief summary of the following decisions:

MAC - Media Access Control restricts network access to unauthorized devices by assigning each network card unique hardware identification.

WEP encryption - software algorithm, which is struggling and decrypts the data when the received output, while maintaining their integrity during transport.

Traditional VPN (Virtual Private Network) security controls - Allows users outside your system to gain access to your network. VPNs encrypt data before sending it through the air, safety data, even if intercepted. VPN is especially important when using public wireless access.

Three simple steps - that's all you need to join the wireless revolution - with relatively little investment in new technologies, you restore a lot of time to improve their operational efficiency at an exponential rate, and streamlined. We have the expertise, incomparable product line and unparalleled pricing to help you become experience all the advantages of the benefits of wireless technology.

Wireless Booster | WiFi Antenna Mod 5dB

2009-08-10T01:49:00.002+07:00

WIFI Antenna Hack! - Click here for more home videos

This is Wireless Booster from metacafe.com.

Wireless Booster | Double Biquad Antenna

2009-07-21T13:11:00.003+07:00

Construction Double Biquad Antenna

I made a double biquad using exactly the same construction techniques as described on my Biquad Antenna Construction page, except the rear reflector is 110x220mm, and the element is double the size.

double biquad
Note that the element wires do not touch where they cross over, but are separated with a gap of approx 1-2mm. To provide some more robustness, and to ensure the element doesn't move, I added some spaces at each end of the element. The spacers are made from a small section cut from a hollow reticulation riser, and attached to the reflector and element using a small wire tie. Measure and cut the spacers to be 14.5mm long, as this should result in the element being the correct 15mm from the reflector.

parts required for the spacers
Drill two small holes in the reflector, in line with each end of the element. The holes must be large enough to allow the wire tie to pass through them.

two holes in the reflector for the cable tie
The spacers are attached by passing the wire tie through one of the holes in the reflector, through the tube, looped around the element, and then passed through the tube again, and through the other hole in the reflector.

spacer installed
The spacers will ensure the posititioning of the element relative to the reflector will not change, and also means the antenna is less likely to be damaged while in transit or while being handled.

detail of spacer
Note that you can make spacers out of any non-metallic material, providing it does not absorb microwaves.

As with the biquad antenna, if you intend to use one of these outdoors, I'd recommend you place it into a weather-proof enclosure, to prevent corrosion, and to prevent water ingress into the coax.

completed double biquad
Testing
To determine the difference in gain between a biquad and the double biquad, some tests were performed, with the signal, noise and SNR recorded.

antenna	SNR (dB)	signal (dBm)	noise (dBm)
biquad	43	-58	-101
double biquad	45	-56	-101

The test results indicate that the gain of the double biquad is approx 2dBi higher than that of the biquad, which is a significant improvement (as 3dBi is a doubling of signal). As the biquad has a gain of 11-12dBi, this means the double biquad has a gain of 13-14dBi, so it's a pretty good performer for something that's relatively easy to build. These results are similar to those obtained by other people who have made double biquads.

Source : http://martybugs.net/wireless/biquad/double.cgi

Wireless Booster | Homebrew Biquad Antenna

2009-07-20T06:04:00.002+07:00

Parts Required
I used the following bits and pieces:

123x123mm square section of blank PCB
50mm length of 1/2" copper pipe
short length of CNT-400 or LMR-400 low loss coax (~300mm long)
250mm of 2.5mm² copper wire (approx 1.5mm diameter)
N connector

Note that you don't have to use blank PCB for the reflector. You can use any material that's electrically conductive, can be electrically connected to the coax braid, and will reflect microwaves (ie, any metal plate will do fine).

Reflector
Cut a square piece of blank printed circuit board, 123x123mm.

Note that Trevor Marshall recommends a size of 123x123mm if using the biquad as a stand-alone antenna, while 110x110 is optimal if using it as a feed for a large dish. He also recommends attaching some lips to two sides of the reflector, to reduce radiation from the rear lobes. Use some steel wool to remove any tarnish and polish it up. Cleaning the copper in this way will make it easier to solder.

blank printed circuit board
Cut a 50mm section of copper pipe, and file both ends smooth. Using some sandpaper and/or some files, polish up the copper pipe (including the inside of the copper pipe, to ensure a good connection with the coax braid).

the dimensions of the copper pipe
Cut a notch into one end of the copper pipe, removing approx 2mm from half the circumference.

a short secion of copper pipe, notched at one end
Drill a hole in the centre of the blank PCB so that the copper pipe is a tight fit in the hole. I found a reamer to be very useful for enlarging the hole to the correct size.

making a hole in the centre
Insert the copper pipe into the hole, with the notched end on the copper side of the blank PCB. The copper pipe should be protruding approx 16mm through the hole, measured on the copper side of the PCB.

insert the copper pipe into the reflector
Solder the copper pipe to the PCB, to ensure a good physical and electrical connection.

solder the copper pipe to the PCB
Quite a bit of heat is needed, due to the thickness of the copper pipe, and an electrical soldering iron probably won't be able to deliver sufficent heat. I found a small gas torch works quite well.

Making the Element
The element is made from a length of copper wire, bent into the appropriate shape.
Note that the length of each "side" should be as close to 30.5mm as possible (measured from the centre of the copper wire to the centre of the copper wire), which is a quarter of a wavelength at 2.4GHz

the shape and dimensions of the element
I had some offcuts of electrical power cable lying around, and found that 2.5mm² power cable had a diameter of approx 1.6mm - a little bigger than the 1.2mm that Trevor Marshall specifies, but didn't think it would make a significant difference to the performance of the biquad.

recycling power cable offcuts
Remove the insulation, measure and cut a 244mm length the copper wire, and straighten it as best as you can.

straighten the wire
Measure the mid-point of the wire, and make a 90 degree bend. The bend should be quite sharp and pronounced.

90 degree bend
Measure the midpoints of each half, and make two more 90 degree bends in the wire, so that it looks like that shown in the photo below.

another two bends
Once again, measure the midpoints of each section, and make some more 90 degree bends, resulting in what is shown below.

bend it some more...
Do the same to the other side, resulting in the biquad shape.

make it symetrical...
Clean up all your bends, and ensure each side of the element is as straight as possible, and as close to 30.5mm as possible.
Note that you may need to trim a small amount off each end of the wire to achieve this.

Assembly
The element must now be attached to the reflector. Note that only the two "ends" of the copper wire are to be attached to the copper pipe - the centre of the copper wire must not touch the copper pipe (hence the notch which was cut into the end of the copper pipe.
The copper wire element should be approximately 15mm away from the reflector. Testing antenna performance while varying the spacing between the copper wire element and the rear reflector indicates that a spacing of approx 15mm provides the lowest SWR (test results available here).

the element soldered onto the copper pipe
Strip approx 30mm of the outer sheath from the end of the coax.

strip the outer sheath
Fold the braid back over the outer sheath, and trim the centre conductor, so that about 4mm is protruding.

fold the braid back, trim the centre conductor
Insert the braid into the copper pipe, so that the end of the centre conductor lines up with the extreme end of the copper pipe, and solder the centre of the element to it, ensuring the centre of the element is not in contact with the copper pipe. Refer to some of the additional photos below for details.

solder the centre conductor to the element

another view
Note that the feed between the rear reflector and the biquad element needs to be shielded. Using coax to feed the biquad element directly, and positioning the coax inside the copper tube achieves this.
Use of bare conductors as a feed between the reflector and biquad element results in a radiating feed (such as this one), which will have a detrimental effect on the biquad's performance. I used a coax crimper to crimp the end of the copper pipe onto the coax. This ensures that the coax would not move inside the copper pipe.

the copper pipe crimped onto the coax

the completed biquad
Now terminate the other end of the coax with an N connector. If desired, you can add spacers at each end of the element, to ensure the element doesn't move in relation to the reflector. Refer to my double biquad page for more details on making spacers to support the element. If you intend to mount the biquad outside, I'd recommend you place it into a weather-proof enclosure, to prevent corrosion, and to prevent water ingress into the coax. Numerous people have used small tuppaware containers successfully.
This can be achieved by drilling a hole in one side of the container, and pass the coax tail through the hole, leaving the biquad itself inside the container. Seal up the hole for the coax with some silicone, and your biquad should be protected against the elements.

another view of the completed biquad

Testing
Some very rough initial testing using the biquad as a feed on a 24dBi Conifer dish looks very promising, with the signal strength being at least as as good as my home made Conifer dipole (I was holding the biquad at approximately the focal point of the dish, and hadn't even removed the Conifer dipole). I also managed to get a marginal link to a 180 degree waveguide on an access point 10km away, using only the biquad by itself, connected to a 30mW RoamAbout wireless card.
Some more detailed testing with multiple antennas, including the biquad shown above, indicates the biquad has a gain of approx 11-12dBi. A friend has access to some antenna test equipment, and performed some tests on the biquad featured on this page. The azimuth plot (ie, radiation pattern) of the biquad is shown below, and shows a 3dB beamwidth of about 50 degrees.

azimuth plot of the biquad
Variations
A number of people have suggested the spacing between the element and the rear reflector should be a 1/4 wavelength (ie, 30.5mm) instead of 15mm. However, test results (such as these) indicate the SWR of the biquad is minimised when the spacing is about 15-17mm.
Increasing the spacing to 30.5mm increases the SWR significantly, thus reducing the efficiency of the biquad. For a higher-gain variation of the biquad that's virtually just as easy to build, have a look at the double biquad.

Usage
When using a biquad to establish a link to another wireless device, you should ensure the polarisation of the biquad is the same as the antenna you are connecting to. Similarily, if establishing a link with two biquads, ensure they are both oriented for the same polarisation. Failing to match the polarisation will result in significant signal loss.

vertically polarised

horizontally polarised

Changing the polarisation is just a matter of rotating the entire biquad antenna by 90 degrees.

The biquad antenna is not particularly directional, but has a fairly wide beamwidth. The 3dB beamwidth for a biquad (without side lips) is typically about 40-50 degrees, thus making it ideal for any applications where you want fairly wide coverage.
The relatively wide beamwidth also makes a biquad very suitable for war-driving and stumbling, allowing you to pick up signals without having to align the antenna directly with the signal source.
While a directional antenna, such as a Conifer dish (3dB beamwidth of a 24dBi Conifer dish is approx 7 degrees), is better suited for point-to-point links, the narrow beamwidth of a Conifer dish requires more precision when aligning the antennas (the narrower the beamwidth, the less susceptible it will be to interferance from other sources). An antenna with a wider beamwidth, such as a biquad, doesn't require the same precision for alignment, thus making it easier to get a link working.

Kits
If you're one of those people who may not have all the tools required for building a biquad antenna from scratch, or you don't want to shop around for all the parts required, you can buy a DIY kit containing all components from WarDrivingWorld.
In November 2006, WarDrivingWorld sent me one of their DIY biquad kits to review. The kit contains all the pre-cut and pre-drilled parts required to build a biquad antenna. For more infomation on this kit, including antenna comparision test results.

Source : http://martybugs.net/wireless/biquad/

7 Tips for Securing Your Wireless

2009-07-17T19:59:00.000+07:00

WLAN hardware was get easlly enough to set up that many users simply plug it in and start using the network without giving much thought to security. Nevertheless, taking a few extra minutes to configure the security features of your wireless router or access point is time well spent. Here are some of the things you can do to protect your wireless network:

1) Secure your wireless router or access point administration interface
Almost all routers and access points have an administrator password that's needed to log into the device and modify any configuration settings. Most devices use a weak default password like "password" or the manufacturer's name, and some don't have a default password at all.  As soon as you set up a new WLAN router or access point, your first step should be to change the default password to something else. You may not use this password very often, so be sure to write it down in a safe place so you can refer to it if needed. Without it, the only way to access the router or access point may be to reset it to factory default settings which will wipe away any configuration changes you've made.

2) Don't broadcast your SSID
Most WLAN access points and routers automatically (and continually) broadcast the network's name, or SSID (Service Set IDentifier). This makes setting up wireless clients extremely convenient since you can locate a WLAN without having to know what it's called, but it will also make your WLAN visible to any wireless systems within range of it. Turning off SSID broadcast for your network makes it invisible to your neighbors and passers-by (though it will still be detectible by WLAN "sniffers").

3)Enable WPA encryption instead of WEP
802.11's WEP (Wired Equivalency Privacy) encryption has well-known weaknesses that make it relatively easy for a determined user with the right equipment to crack the encryption and access the wireless network. A better way to protect your WLAN is with WPA (Wi-Fi Protected Access). WPA provides much better protection and is also easier to use, since your password characters aren't limited to 0-9 and A-F as they are with WEP. WPA support is built into Windows XP (with the latest Service Pack) and virtually all modern wireless hardware and operating systems. A more recent version, WPA2, is found in newer hardware and provides even stronger encryption, but you'll probably need to download an XP patch in order to use it.

4) Remember that WEP is better than nothing
If you find that some of your wireless devices only support WEP encryption (this is often the case with non-PC devices like media players, PDAs, and DVRs), avoid the temptation to skip encryption entirely because in spite of it's flaws, using WEP is still far superior to having no encryption at all. If you do use WEP, don't use an encryption key that's easy to guess like a string of the same or consecutive numbers. Also, although it can be a pain, WEP users should change encryption keys often-- preferably every week.

5) Use MAC filtering for access control
Unlike IP addresses, MAC addresses are unique to specific network adapters, so by turning on MAC filtering you can limit network access to only your systems (or those you know about). In order to use MAC filtering you need to find (and enter into the router or AP) the 12-character MAC address of every system that will connect to the network, so it can be inconvenient to set up, especially if you have a lot of wireless clients or if your clients change a lot. MAC addresses can be "spoofed" (imitated) by a knowledgable person, so while it's not a guarantee of security, it does add another hurdle for potential intruders to jump.

6) Reduce your WLAN transmitter power
You won't find this feature on all wireless routers and access points, but some allow you lower the power of your WLAN transmitter and thus reduce the range of the signal. Although it's usually impossible to fine-tune a signal so precisely that it won't leak outside your home or business, with some trial-and-error you can often limit how far outside your premises the signal reaches, minimizing the opportunity for outsiders to access your WLAN.

7) Disable remote administration
Most WLAN routers have the ability to be remotely administered via the Internet. Ideally, you should use this feature only if it lets you define a specific IP address or limited range of addresses that will be able to access the router. Otherwise, almost anyone anywhere could potentially find and access your router. As a rule, unless you absolutely need this capability, it's best to keep remote administration turned off. (It's usually turned off by default, but it's always a good idea to check.)

WiMAX In Home

2009-07-16T11:05:00.000+07:00

Here's what would happen if you got WiMAX. An Internet service provider sets up a WiMAX base station 10 miles from your home. You would buy a WiMAX-enabled computer or upgrade your old computer to add WiMAX capability. You would receive a special encryption code that would give you access to the base station. The base station would beam data from the Internet to your computer (at speeds potentially higher than today's cable modems), for which you would pay the provider a monthly fee. The cost for this service could be much lower than current high-speed Internet-subscription fees because the provider never had to run cables.

If you have a home network, things wouldn't change much. The WiMAX base station would send data to a WiMAX-enabled router, which would then send the data to the different computers on your network. You could even combine WiFi with WiMAX by having the router send the data to the computers via WiFi.

WiMAX doesn't just pose a threat to providers of DSL and cable-modem service. The WiMAX protocol is designed to accommodate several different methods of data transmission, one of which is Voice Over Internet Protocol (VoIP). VoIP allows people to make local, long-distance and even international calls through a broadband Internet connection, bypassing phone companies entirely. If WiMAX-compatible computers become very common, the use of VoIP could increase dramatically. Almost anyone with a laptop could make VoIP calls.

New Technology WiMAX

2009-07-16T11:02:00.001+07:00

Think about how you access the Internet today. There are basically three different options:

Broadband access - In your home, you have either a DSL or cable modem. At the office, your company may be using a T1 or a T3 line.
WiFi access - In your home, you may have set up a WiFi router that lets you surf the Web while you lounge with your laptop. On the road, you can find WiFi hot spots in restaurants, hotels, coffee shops and libraries.
Dial-up access - If you are still using dial-up, chances are that either broadband access is not available, or you think that broadband access is too expensive.

The main problems with broadband access are that it is pretty expensive and it doesn't reach all areas. The main problem with WiFi access is that hot spots are very small, so coverage is sparse.

What if there were a new technology that solved all of these problems? This new technology would provide:

The high speed of broadband service
Wireless rather than wired access, so it would be a lot less expensive than cable or DSL and much easier to extend to suburban and rural areas
Broad coverage like the cell phone network instead of small WiFi hotspots

This system is actually coming into being right now, and it is called WiMAX. WiMAX is short for Worldwide Interoperability for Microwave Access, and it also goes by the IEEE name 802.16.

WiMAX has the potential to do to broadband Internet access what cell phones have done to phone access. In the same way that many people have given up their "land lines" in favor of cell phones, WiMAX could replace cable and DSL services, providing universal Internet access just about anywhere you go. WiMAX will also be as painless as WiFi -- turning your computer on will automatically connect you to the closest available WiMAX antenna.

In this article, we'll find out how WiMAX works, what engineers are doing to make it better and what it could mean for the future of wireless Internet.

Better in Modificatin Wireless

2009-07-14T07:08:00.000+07:00

At this time, I want to thank the faithful readers of my blog beloved modification wireless. But before I want to say sorry because sebesarnya a few things that cause the migration domain for my blog this, so that the readers a bit difficult and may feel uncomfortable to say this is my request sorry.

At the time I post this, to the post-100 I feel very proud to have successfully regale the readers with a wide range of modification of the antenna, although some modifications to the antenna from my blog a little difficult and even impossible, but the goal of any posts I do not another is to share the tricks and techniques of antenna modifications.

I really hope and try to all the readers of this blog so that I always feel comfortable with my blog. And for that I will always try to give tips and tricks about how the new way to modify the wireless antenna, Poe, and firmware modification. May increase with my posting this, I can give something better for the readers, something more useful and helpful for all of us.

Regard

Denny

Wireless Booster | New Homebrew 3D Antenna

2009-07-08T10:37:00.001+07:00

This is great antenna 3D, but I didn't try it before. If you wanna try it you can download the ebook of this antenna in here download. This is the picture of antenna 3D homebrew. I belive it's to be good for wireless booster.

Wireless Booster | Spider Antenna Omni

2009-07-08T10:27:00.001+07:00

The omni-directional antenna was built using an N-type chassis mount connector with short lengths of stiff fencing wire soldered into each corner hole. The driven element (the wire soldered into the centre, or conductor) was a quarter wavelength (32 millimetres) as was each ground plane (four soldered around the body of the connector). Each groundplane was cut to length and then bent over at 30 degrees below the horizontal to attempt to match the impedance to 50 Ohms.

Antenna Characteristics

2009-07-06T07:23:00.000+07:00

Antenna Characteristics are :

Radiation Pattern:
Radiation is maximum when broadside, or perpendicular to a wire, so a vertical whip is ideal for communication in any direction except straight up. The radiation “pattern”, perpendicular to the whip, can be described as omnidirectional. There is a ”null”, or signal minimum, at the end of the whip. With a less than ideal antenna, such as a bent or tilted whip, this null may move and partly disappear. It is important to know the radiation pattern of the antenna, in order to insure that a null is not present in the desired direction of communication.

Gain:
An antenna that radiates poorly has low “gain”. Antenna gain is a measure of how strongly the antenna radiates compared to a reference antenna, such as a dipole. A dipole is similar to a whip, but the groundplane is replaced with another quarter-wave wire. Overall performance is about the same. An antenna that is 6 dB less than a dipole is -6 dBd. This antenna would offer one half the range, or distance, of the dipole. Compact antennas are often less efficient than a dipole, and therefore, tend to have negative gain.

Impedance:
Another important consideration is how well a transmitter can transfer power into an antenna. If the antenna tuning circuit on a transmitter (or receiver) is designed for a 50 ohm load, the antenna should, of course, have an impedance near 50 ohms for best results. A whip over a flat groundplane has an impedance near 35 ohms, which is close enough. The impedance changes if the whip is mistuned or bent down, or if a hand or other object is placed close to it. The impedance becomes lower as the antenna is bent closer to ground. When the whip is tilted 45 degrees, the impedance is less than 20 ohms. When the whip is bent horizontal to one-tenth of a wavelength above ground, the impedance approaches 10 ohms. The resulting impedance mismatch, a 5:1 ratio (VSWR) will contribute an additional loss of 2.6 dB.

Polarization:
It is important that other antennas in the same communication system be oriented in the same way, that is, have the same polarization. A horizontally polarized antenna will not usually communicate very effectively with a vertical whip. In the real environment, metal objects and the ground will cause reflections, and may cause both horizontal and vertical polarized signals to be present.

New Homebrew Sectoral Antenna

2009-07-03T05:21:00.001+07:00

This is my new homebrew sektoral antenna, for my RTRW-NET (base-station small-scale). Specification of this antenna are :

1. Type External, Sektoral Antenna
2. Application for hotspot of IEEE 802,11 b/g
3. Frequency of this antenna 2,4Ghz - 2,5Ghz
4. Gain antenna 18 dBi
5. Polaritation of antenna Vertical
6. Impedance 50 Ohm
7. Interface connector type N male

This the picture of my homebrew antenna.

The best sektoral antenna I have, with 18 dBi and vertical polaritation I can reach range up to 5 Km with tower height 20m. And I used this antenna with WRT54GL access point. Very powerfull I think.

Easy Homemade Wireless Booster | Helical Antenna

2009-06-29T06:31:00.002+07:00

As some of the readers may know, an effort by members of the Canberra Linux Users Group has been launched to set up a Canberra-wide wireless LAN. This amateur experiment's existence is largely due to the acquisition of many cut-price old style Lucent WaveLAN cards being superseded by the IEEE 802.11 standard cards.

The cards were cheap but the tile antennas that came with them are no good for long haul links of more than several hundred metres. On top of this, commercial helical aerials antenna that can do the job are expensive, can get rather large and are ugly, especially the conifers. My Mum would not want one on her roof. Consequently, there is no reason why this aerial couldn't also be used with any other equipment that requires a broad bandwidth in the 2.425GHz band such as the new 802.11 wireless network cards or video transmitters. Wireless Booster.

If anyone does use the helical aerial with these bits of equipment, please let me know! The idea behind this aerial was for anyone to be able to make their own aerial for point to point links, and do it cheaply. The criteria are cost effectiveness, ease of construction and durability. Durability is important as you don't want wind, beak cleaning magpies and highly destructive nibbling cockatoos ruining your Quake III and Unreal Tournament sessions. Birds landing on the aerial have the effect of severely diminishing the signal, too. The aerial was derived from information on helical antennas in the ARRL Antenna book.

If you like to continued reading, download this ebook. Full of part, and tutorial how to make homemade helical antenna. Download tutorial ebook how to make homemade helical antenna

Easy Homemade Sectoral Antenna

2009-06-29T05:51:00.002+07:00

Part :
1. Pipe Paralon 3"
2. Pigtail
3. Alumunium Foil
4. The Hands Bore
5. The Hammer
6. Closed the pipe
7. The nut and the bolt

This is part that I need to create Sectoral antenna.

And also make that alumunium foil for this hole, it used for gound when you place pigtail.
I used electric gimlet for make hole in Pipe that use to pigtail.

In this Pic, I use the alumuium Foil in surface of pipe.

Use alumunium foil too in duff (close pipe)

The piece copper with the long measurement 3 inch, then gave tin on the end.

Soldier the pigtail with a copper. And measuring the length of copper.

Now pigtail was ready in put in the pipe that was given alumunium foil.

Use the iron plate as the mount of this antenna sectoral and used the bolt as well as the nut to tighten him

Attach this iron plate in closed the pipe that was given alumunium foil.

Now homemade antenna sectoral you were, it's so easy right :)

54Mbps - Medialink Wireless G USB Adapter

2009-06-26T21:17:00.000+07:00

Offering the ultimate in simplified Wi-Fi installation, Medialink's 54Mbps Wireless G USB Adapter works with any manufacturer's 802.11B or 802.11G wi-fi router and offers a simplified one click installation. Insert the CD, click "install software" and the utility will auto-detect your operating system and install the appropriate drivers. Simply plug in your adapter and enjoy the convenience of your wifi network. Surprisingly, many wifi adapters on the market are not Microsoft WHQL certified to ensure trouble-free compatibility with Microsoft's operating systems. To provide our customers with ultimate confidence in our products, all Medialink adapters are Microsoft WHQL certified.

In addition, this adapter features internationally recognized standards-based security features including WPA/WPA2, IEEE802.1X as well as 64/128/152-bit WEP for the ultimate in sucurity. MAC filtering is also available. With these enhanced security features, you can feel confident that you have state of the art wifi security options.. This USB adapter includes a Medialink Wireless Client Utility to auto-detect available wireless networks for quick connection. The utility also conveniently allows you to create and save detailed connectivity profiles for different accessed networks.

The Medialink Wireless Client Utility also provides a number of tools to display current diagnostics and status information so that you can easily diagnose and resolve connection problems. Offering excellent wireless performance and network security, the Medialink 54Mbps Wireless G USB Adapter is an excellent choice for adding wireless connectivity to your desktop or notebook PC.

Linksys WUSB600N Best and Cheap USB Wireless

2009-06-18T02:08:00.000+07:00

The Ultra RangePlus Dual-Band Wireless-N USB Network Adapter is the simple way to add or upgrade wireless connectivity in your desktop or notebook computer. Just plug it into your computer s USB port and enjoy incredible high-speed wireless network access

Product Details

High-speed Wireless-N (draft 802.11n) networking for notebook and desktop computers
MIMO technology uses multiple radios per band to create robust signals for maximum range and speed, with reduced dead spots
Operates in the 2.4 and 5GHz radio bands -- choose the one with least congestion in your area
Also connects to Wireless-G, -B, and -A networks

Product Specs

Product Dimensions: 10 x 2 x 8 inches ; 0.8 ounces
Shipping Weight: 2 pounds
Shipping: Currently, item can be shipped only within the U.S.
Item model number: WUSB600N
Amazon.com Sales Rank: #316 in Electronics

D-Link Xtreme N Gigabit Router (DIR-655)

2009-06-18T01:52:00.000+07:00

The D-Link Xtreme N Gigabit Router (DIR-655) is a draft 2.0 802.11n compliant device that delivers up to 14x faster speeds* and 6x farther range* than 802.11g while staying backward compatible with 802.11g devices. Connect the Xtreme N Gigabit Router to a cable or DSL modem and provide high-speed Internet access to multiple computers, game consoles, and media players. Create a secure wireless network to share photos, files, music, videos, printers, and network storage.

Powered by Xtreme N technology and equipped with three external antennas, this router provides superior wireless coverage for larger homes and offices, or for users running bandwidth-intensive applications. The DIR-655 also includes a 4-port 10/100/1000 Gigabit switch that connects Gigabit wired devices for enjoying lag-free network gaming and faster file transfers.

With wireless prioritization technology and our award-winning intelligent QoS engine, jitter-free Internet phone calls (VoIP), high-definition video streaming and Web gaming are achievable on your wired and wireless networks. Support for WEP, WPA, and WPA2 security standards ensure that you will be able to use the best possible encryption regardless of your other wireless devices. To prevent possible attacks from the Internet, the DIR-655 uses dual active firewalls (SPI & NAT) to help protect your valuable data. Below is a list of DIR-655 features.

Intelligent QoS technology prioritizes both wired and wireless Internet traffic to enable enhanced gaming and phone calling (VoIP) experience
Ideal for streaming HD video or streaming multiple applications simultaneously
Dual active firewall protection (SPI & NAT) helps block malicious attacks on networks from the Internet
Includes the latest wireless security (WEP, WPA & WPA2) features that help prevent unauthorized access
Virtually no wireless dead spots
Advanced Parental Controls
Supports Windows Connect Now (WCN) for easy wireless setup
Automatic Firmware Update Notification
E-mail Notification for Triggered Events
Integrated Wireless Security Wizard
Removable Antennas for Flexible Installation Options
Wall Mountable to Save Desk Space

Why Intelligent QoS Is Better
With some routers, all wired and wireless traffic, including VoIP, Video Streaming, Online Gaming, and Web browsing are mixed together into a single data stream. By handling data this way, applications like video streaming could pause or delay. With D-Link’s Intelligent QoS Technology, wired and wireless traffic is analyzed and separated into multiple data streams. These streams are then categorized by sensitivity to delay, so applications like VoIP, Video Streaming, and Online Gaming are given priority over Web browsing. This enables multiple applications to stream smoothly to your TV or PC.

Advanced Network Security
The Xtreme N Gigabit Router supports the latest wireless security features to help prevent unauthorized access, be it from over a wireless network or from the Internet. Support for WPA™ and WPA2™ standards ensure that you will be able to use the best possible encryption regardless of your client devices. In addition, this Xtreme N router utilizes Dual Active Firewalls (SPI and NAT) to prevent potential attacks from across the Internet. Also, the DIR-655 uses advanced firewall features. The web-based user interface displays a number of advanced network management features including:

Content Filtering--Easily applied content filtering based on MAC Address, URL, and/or Domain Name.
Filter Scheduling--These filters can be scheduled to be active on certain days or for a duration of hours or minutes.
Secure Multiple/Concurrent Sessions--The DIR-655 can pass through VPN sessions. It supports multiple and concurrent IPSec and PPTP sessions, so users behind the DIR-655 can securely access corporate networks.

Delivering best-in-class performance, network security, and coverage, the Xtreme N Gigabit Router (DIR-655) is the ideal centerpiece for your wireless network in the home or office.

Shareport
With SharePort technology you can connect a USB printer or storage device to your router and allow users to access them from anywhere on the network. Conveniently turn your existing USB printers and storage devices into network devices for everyone to share.

SECURESPOT 2.0
SECURESPOT 2.0 is total network security for multiple computers in your home. With the unique Web-based console you can monitor, install, and control how your network is protected from a single location.

SECURESPOT Features:

Firewall Protection
Parental Controls
Parental Reporting and Alerts
Identity Protection
Pop-up Blocker
Virus/Spyware Protection – Powered by McAfee®
Spam Control
Access Control
Remote Management Console

What This Product Does
Create a wireless network to share high-speed Internet access with computers, game consoles, or media players from greater distances in your home or office. Use the DIR-655 in your home to surf the web, check email, instant message, and to get rid of the cables around the house. Use the DIR-655 in your office to share Internet connection and printer with multiple computers, saving additional office space.

XTREME N Router Benefits

Intelligent Wireless Prioritization Technology.
Xtreme N technology allows for farther home coverage*.
Secure your wireless network using advanced WPA or WPA2 encryption.
Easy to get started with D-Link’s new Quick Router Setup Wizard.
Supports Good Neighbor Policy--will not interfere with other wireless networks.
Backward compatible with 802.11g devices including game consoles and digital media players.

Works with Windows Vista
Allows easy management, high standards of wireless security, and various levels of compatibility

DIR-655 has been designed by D-Link to Work with Windows Vista.
Products that carry the Works with Windows Vista logo are designed to easily connect to Windows Vista and deliver a reliable experience.

D-Link’s Xtreme N router was rigorously tested and verified for compatibility with Intel’s Next-Gen Wireless N, utilizing intensive real-world testing conducted in typical home and enterprise environment scenarios. In Intel’s testing process, which was conducted over the period of several months, D-Link’s Xtreme N router met or exceeded Intel’s requirements for performance, extended range, co-existence with other 802.11b/g clients and access points, and the ability to eliminate Wi-Fi dead spots.

* Maximum wireless signal rate derived from IEEE Standard 802.11g and draft 802.11n specifications. Actual data throughput will vary. Network conditions and environmental factors, including volume of network traffic, buildings materials and construction, and network overhead, lower actual data throughput rate. Environmental factors will adversely affect wireless signal range. Wireless range and speed rates are D-Link RELATIVE performance measurements based on the wireless range and speed rates of a standard Wireless G product from D-Link. Maximum throughput based on D-Link draft 802.11n devices.
** Requires SharePort Client Utility installation on the PC. SharePort upgrade is available for the hardware versions A2, A3, A4.

Linksys WRT54G2 Just $44.99

2009-06-18T01:46:00.000+07:00

The Linksys WRT54G2 Wireless-G Broadband Router is really three devices in one box. First, there's the Wireless Access Point, which lets you connect both screaming fast Wireless-G (802.11g at 54Mbps) and Wireless-B (802.11b at 11Mbps) devices to the network. There's also a built-in 4-port full-duplex 10/100 switch to connect your wired-Ethernet devices together. Connect four PCs directly, or attach more hubs and switches to create as big a network as you need. Finally, the router function ties it all together and lets your whole network share a high-speed cable or DSL Internet connection.

Once your computers are connected to the router and the Internet, they can communicate with each other too, sharing resources and files. All your computers can print on a shared printer connected anywhere in the house. And your computers can share all kinds of files--music, digital pictures, and documents. Keep all your digital music on one computer, and listen to it anywhere in the house. Organize all of your family's digital pictures in one place, to simplify finding the ones you want, and easing backup to CD-R. Utilize extra free space on one computer when another's hard drive starts to fill up.

The new Wi-Fi Protected Setup feature makes it easy to configure your wireless devices. Just push the button on the router and on your other Wi-Fi Protected Setup-enabled wireless device to automatically create a WPA2 connection that protects your data and privacy with up to 256-bit industrial-strength encryption. The router can serve as a DHCP Server, has a powerful SPI firewall to protect your PCs against intruders and most known Internet attacks, supports VPN pass-through, and can be configured to filter internal users' access to the Internet. Advanced configuration is a snap with the web browser-based interface.

With the Linksys WRT54G2 Wireless-G Broadband Router at the center of your home or office network, you can share a high-speed Internet connection, files, printers, and multi-player games with flexibility, speed, security and simplicity.

Best Access Point Linksys WAP54G

2009-06-16T05:00:00.000+07:00

The Linksys Wireless-G access point lets you connect Wireless-G (802.11g ) or Wireless-B (802.11b) devices to your network. Because both standards are built-in, you can protect your investment in existing 802.11b infrastructure, and migrate your network clients to the new screaming-fast Wireless-G standard as your needs grow. For more information on the differences between an access point and a router with access point, see the following table:

To protect your data and privacy, the Wireless-G access point can encrypt all wireless transmissions. The MAC address filter lets you decide exactly who has access to your wireless network. Configuration is a snap with the Web browser-based configuration utility.

Wireless-G is the upcoming 54 Mbps wireless networking standard that's almost five times faster than the widely deployed Wireless-B (802.11b) products found in homes, businesses, and public wireless hotspots around the country--but since they share the same 2.4 GHz radio band, Wireless-G devices can also work with existing 11 Mbps Wireless-B equipment.

Future-proof your wireless network with the Linksys Wireless-G access point. You'll enjoy Wireless-B connectivity today, and be prepared for a high-speed Wireless-G tomorrow.

Hack Antenna D-Link DWA G-122

2009-06-16T04:33:00.000+07:00

This is my update modification on antenna wireless.

Antenna modification in D-Link DWA G-122. So check it out in this pic.

And this is how to make this antenna work.

Finishing this antenna, make sure that wireless card work :)

Military Grade Maximum Level Wireless LAN Security

2009-06-10T02:38:00.000+07:00

Level 4: Military grade maximum level Wireless LAN Security

Level 4 builds on Level 3 but aims to solve the key logging certificate stealing malicious code threat. From a PKI Certificate Authority standpoint, not only is a 3 tier architecture required but the use of FIPS 140-2 Level 3 compliant HSMs (Hardware Security Modules AKA Cryptographic Modules for server side applications) are mandated. These modules cost thousands of dollars in the form of a tamper resistant external module. All Certificate Authorities should use one of these modules to ensure maximum security. Even a malicious code compromise on the Root Certificate Authority cannot compromise the Root CA's private key although such a compromise on a Certificate Authority would still be very serious. This is why the top two tiers of the PKI chain are never connected to the network as an extra precaution so that all interactions between the PKI tiers must be hand carried.

On the user side, the Digital Certificate cannot be stored on the hard drive so EAP-TLS or PEAP-EAP-TLS with "hard" tokens are mandatory. The certificates must be stored inside an HSM (these are called Cryptographic Tokens on the client side) which are typically in the form of a USB dongle the size of two fingers carried on a person's key chain or a smartcard. USB dongles are usually much more practical because they can be used by notebooks without a smartcard reader. Some newer Notebook computers have a built in HSM called a TPM (Trusted Platform Module) but it can't be separated from the computer. If an HSM empowered computer is infected with malicious code, the password can be logged and stolen but the digital certificate cannot.

This is because the HSM never divulges the private key of the digital certificate to its host computer because all asymmetric cryptographic operations happen inside the HSM and not on its host computer. This makes it nearly impossible to steal a private key unless the TPM Notebook or USB dongle is physically stolen. If that were to occur, it would be fairly obvious and the Digital Certificate stored inside the stolen HSM could be easily revoked by an administrator as part of the PKI management process. To further enhance security, more expensive USB dongles and smartcards have built in finger print readers so that they are useless unless they have your living finger or they can figure out some extremely complex method of fooling the finger print reader. But the biometrics portion is just a last defense meant to buy you enough time to revoke a certificate before unauthorized access is gained. With biometrics enabled HSMs, you have the strongest 3-factor authentication system possible.

From an encryption standpoint, AES is the only encryption algorithm permitted for Level 4 and it also happens to be mandated for federal government and military applications. AES was created by the NIST and its encryption algorithm was selected from a list of finalists that represented the best encryption algorithms in the world. To comply with the AES requirement, 802.11i (AKA WPA2) compliant Wi-Fi gear is required on all Access Points, client Adapters, and software. Most consumer Wi-Fi products sold do not support 802.11i while most newer business class Wi-Fi products do. You'll have be look for the 802.11i or WPA2 logo on any Wi-Fi products you buy. Many organizations may already own products that are AES compliant if they would simply update their firwares and drivers on their Access Points and Client Adapters.

Cisco products are a perfect example of this because it is probably the most dominant player in the enterprise Wireless LAN market yet most of their customers are not running the latest firmware. Upgrades on such a large scale are very difficult but corporations cannot afford to put off good security because not only is it good business, it may be the law because of SOX and HIPAA compliance.

From a vulnerability standpoint, Level 4 is rock solid and extremely difficult to compromise. The hacker would have to not only steal a user's password, but also physically steal that user's cryptographic token or a TPM notebook and take advantage of it before the user realizes anything wrong and reports the theft. With 3-factor authentication, it is practically impossible to break in to the Wireless LAN from the wireless side. The attacker will have to try some other means of compromising the network and a crowbar would be far more effective at that point.

Medium to Large Enterprise Wireless LAN Security

2009-06-07T04:10:00.000+07:00

Level 3: Medium to Large Enterprise Wireless LAN Security

Level 3 Wireless LAN security builds on the same principles of Level 2, but you're not allowed to use the "cheats" such as bolting on the RADIUS server on to an existing server or using Self Signed Digital Certificates. PEAP-EAP-MSCHAPv2 is also disallowed because of its sole dependency on passwords which would be classified as "single factor" authentication. EAP-TLS or PEAP-EAP-TLS using "soft" Digital Certificates (certificates that are stored on the user's hard drive) would be the recommended authentication method for this security level. PEAP-EAP-TLS is an improved version of the original EAP-TLS protocol that goes further to encrypt client digital certificate information. Both PEAP-EAP-TLS and EAP-TLS have the same server and client side digital certificate requirements, but PEAP-EAP-TLS may not be compatible with some older Supplicants (Client Software) or some non-Microsoft client side implementations.

To implement EAP-TLS or PEAP-EAP-TLS, not only does the server require a Digital Certificate but the users as well. This means you will need a full blown Certificate Authority to issue a proper Server Digital Certificate on a pair of dedicated RADIUS servers and not just a Self Signed Certificate on a makeshift RADIUS Server. For this security level, the proper PKI best practices should be followed. There should be at least a single dedicated PKI Root Certificate Authority, but preferably it should at least be a 2 or 3 tier PKI design.

A two tier chain for a medium Enterprise organization would have an offline Root Certificate Authority and an online Issuing Certificate Authority. A large Enterprise should implement the three tier design with offline Root Certificate Authority, offline subordinate Certificate Authority, and online Issuing Certificate Authority. The reason for this is that if a Certificate Authority is ever compromised, you can revoke it and create a new one from the higher offline Certificate Authorities without having to start your PKI deployment from scratch. Building a PKI from scratch because of a compromised Certificate Authority would be completely unacceptable in a large scale environment.

To deploy Digital Certificates to the user community, a PKI management infrastructure must be deployed and permanent human resources must be allocated to manage end user certificates if your user base numbers in the thousands or more. Medium size Enterprises can add PKI management to their current hire/termination procedure. Microsoft Active Directory with an Enterprise Root Certificate Authority (a PKI that is completely integrated in to an Active Directory) can issue digital certificates automatically, but be warned that this is not a substitute for proper management. Lost or stolen laptops or terminated employees must have their digital certificates revoked and this is not an automatic process even if a user account is disabled or deleted.

After the certificates are revoked, they must be published in a CRL (Certificate Revocation List) and be applied to all Authentication servers or else the revoked certificates are still usable. If Active Directory auto-enrollment is used, it is highly recommended that you do not just apply the policy to the entire domain by default so that everyone will automatically get a user digital certificate. The policy should be set on just a particular OU (Organizational Unit) so that users who need user certificates and Wireless LAN access must be manually moved to that Certificate enabled OU. Automatic enrollment should be used as a way to simplify management, not substitute management.

As for encryption, the same requirements and recommendations from the previous 2 levels applyl. TKIP at a minimum but AES is recommended as soon as possible. Level 3 organizations should probably be the first to jump to the next level of encryption. The size of these organizations that would select Level 3 wireless LAN security can make upgrading difficult, but it's too important to ignore. The good news is that once AES is achieved, it is expected to hold for some time.

From a vulnerability standpoint, Level 3 is reasonably secure. The only way to compromise this security level is if the hacker can not only steal a user's password, but also steal that user's Digital Certificate which is much more difficult than just stealing a user's password. To steal a "soft" Digital Certificate, either the laptop needs to be stolen in which case it would be obvious and the certificate could be revoked, or a malicious program like a backdoor, virus or worm would have to be installed on the laptop to "harvest" the private key of the digital certificate.

The latter option is much more sinister because a theft could occur totally undetected and the certificate would not be revoked. The same malicious code could also "log" the user's keystrokes and the user's password would be compromised as well. At this point, Level 3 security would be totally defeated hence the need for an even stronger solution in Level 4. Discriminating Enterprises should seriously consider the next security level.

Small Business Wireless LAN Security

2009-06-01T06:27:00.001+07:00

Level 2: Small Business Wireless LAN Security

Little businesses must move on the far side Level 1 by incorporating authentication in to their Wireless LAN access controls. The similar method for doing this is 802.1x and PEAP or TTLS authentication. 802.1x limits access to the Datalink layer of a network through only allowing access to the network if a client demonstrates their personal identity by the EAP (Extensible Authentication Protocol) mechanism. There are a few forms of EAP, but the two forms of EAP are most suitable for Level 2 security system is PEAP (Protected EAP) and TTLS (Tunneled Transport Layer Security).

To implement PEAP or TTLS, the system needs to carry out a RADIUS Authentication Server. There are options for Microsoft Windows 2003 Server with IAS, third company applications program specified Funk Odyssey (needed for TTLS mode) that run on Windows, Open Source solutions with FreeRADIUS.

The easiest way by far if you are a Microsoft Windows 2003 Server shop is to use the built in RADIUS server of Windows 2003 known as IAS (Internet Authentication Server). For a small business, there is nothing incorrectly by adding the IAS service to an existing Windows 2003 server truely if it is their only server which in addition to chances to be the Active Directory server. You will be able to change over that server in to a Certificate Authority as well and allow yourself a digital certificate for the RADIUS server or simply Self Sign a digital certificate. With this in place, the Root Certificate (the public key of the Digital Certificate) for the RADIUS server must be installed in all of the client's computers. On Active Directory, these could be easy by pushed out via Group Policy. Each of the clients also take to configure their wireless settings on the WZC (Wireless Zero Configuration) service inherent to Windows XP SP1 or SP2. A protected wireless network could be deployed throughout an organization big or small in hours. If you do not have IAS, it comes with Windows 2003 Standard Edition which costs around $500 per copy. IAS in my experience is extremely rich, true, and secure.

For those who want to implement TTLS, they will need to either buy Funk Software's Odyssey server (in the $2000 range) or implement FreeRADIUS on Linux which is Open Source. Notice that Windows does not have a inherent TTLS client built in, you will need to buy a wireless Supplicant (also known as Client software) for your end users. MDC has an Open Source edition for Linux, but you will take to buy single for Windows which is what most people are using. You will either take to implement the Root Certificate on the Clients manually or you will take to buy a third party Digital certification which has its Root Certificate already preinstalled.

Although 802.1x and PEAP or TTLS addresses the authentication one-half by the equation while it concerns security system, encryption must too be addressed. Up until past months, it was thinking that "Dynamic WEP" wherever WEP keys are rotated frequently (usually 10 minutes) was considered to be "good enough" encryption. With the future generation of WEP cryptography tools, this is no more the case and TKIP is the new bare minimum. The WPA standard implements TKIP which are an rewrite by the WEP communications protocol which will hold against latest cryptanalysis techniques for now, but earlier methods of attacking TKIP are on the horizon. The true long term solution from the IEEE standards body is the 802.11i standard which authorizations AES. The recommendation for Level 2 done 3 is that you should be using WPA with TKIP at a lower limit and upgrade to AES as soon as possible.

From a exposure point of view, the simply method to break down this security system level is to steal a client certificate by either looking across somebody shoulders to find out what password they are typing, sweet talk them in to telling you what the password is (this is easier than you believe), or installing a key logger on to a user's computer so you will be able to record their key strokes when they type in the password. Blocking off password theft, it would be far easier to breaking and entering to your premise and beg in to a Wired LAN than to attempt to crack Level 2 Wireless LAN security. Level 2 is a good option for most small businesses but organizations wherever security system are a high-level priority had better seriously consider the next two levels because a individual lost password could compromise the whole system.

Home and SOHO Wireless LAN security

2009-05-31T23:13:00.000+07:00

Level 1: Home and SOHO Wireless LAN security

Unfortunately, a lot of home users are either using a few old equipment, older drivers, or older operating systems that do not natively confirm WPA and then it's still using WEP whenever anything in the least. WEP encryption was believed to be good since a week for easiest traffic home wireless networks because the older WEP cracking tools took 5 to 10 million packets to find a WEP key, but the latest WEP cracking methods can break down WEP in minutes. Still if there isn't that a lot traffic, the attacker instantly has got ways to unnaturally generate traffic and speed up WEP cracking. As of this, consumers had better keep off whatever product that doesn't support WPA TKIP mode at a minimum but rather WPA AES capable or WPA2 certified devices.

If they have got WEP single devices, check on the seller to check whenever there is any firmware and/or device driver updates that will upgrade the device to WPA mode. If not, anybody who concerns about privacy should throw away those devices. As harsh as that may sound, it is comforting to know that newer Access Points and Client Adapters that do support WPA can be purchased for as little as $30. Customer side Wireless local area network software system (officially called Supplicants) also need to be updated to support WPA or WPA2. Windows XP SP1 with the WPA patch can answer, but Windows XP SP2 is highly recommended.

The home or SOHO (Small Office Home Office) surroundings are really unlikely to have any rather Authentication and PKI in place. This may change once TinyPEAP gets established, but that is currently in BETA form and isn't fix for quality time yet. TinyPEAP puts a PEAP authentication server and PKI Certificate Authority in your home's WLAN enabled Linksys Router which was once the single area from large organizations with committed authentication servers. For the moment, the only workable choice for this environment is WPA PSK (Wi-Fi Protected Access Pre-Shared Key) mode.

WPA mode mandates TKIP at a minimum but also has an optional AES encryption mode. AES mode is highly recommended since it's a rock solid origin in cryptographic resistance where as TKIP may be under attack in the near later. Annotation that AES in WPA2 (full ratified edition of 802.11i) are no more optional and are mandated nowadays. Since most home users would be lucky if totally from their equipment and software system was TKIP capable, most homes will accept to be content with TKIP mode for now.

WPA PSK mode could be an good security system mechanism but leaves many to be desired in terms of usability. This is because WPA PSK can be cracked on offline dictionary attacks and then them trusts on a strong random passphrase to be powerful. Unfortunately, human race are really bad at learning long random string section from characters and will nearly always to use simple to think of words and phrases or a few slight variation from that. This brings itself to dictionary attacks wherever a hacker will try every variation of all combination of words in the dictionary.

To create this really difficult to hack, use a 10 digit string by random characters contained of a-z, A-Z, 0-9 or apply a very long word phrase assembled by 20 or more characters. Unfortunately, this will force a lot of users to write down their passphrases which in itself may lead to passphrase theft. WPA PSK isn't a good long term security system solution and leaves Level 1 security system with much to be desired, but it can be secure when used correctly.

Wireless LAN Security

2009-05-31T01:00:00.000+07:00

Among the primary questions that people ask me all but Wireless LAN is "are Wireless LAN truly secure?" In real time followed through of "what rather security do I take for my Wireless LAN?" The solution to the first query is "yes, whenever you put through safe security system" but the secondly question thrusts me to resort to the old "it depends". It depends upon what point of risk are accepted to your base or system.

It depends upon what level by management and price you're conformable to accept. To simplify this highly composite subject, I have go on with 4 absolute levels of WLAN (Wireless LAN) security system as a general guideline that is designed to suit everyone's needs from the base to the military.

    * Level 1: Home and SOHO Wireless LAN security
    * Level 2: Small Business Wireless LAN security
    * Level 3: Medium to large Enterprise Wireless LAN security
    * Level 4: Military grade maximum level Wireless LAN security

Guide to Wireless Networking

2009-05-29T03:23:00.000+07:00

1. Speed - Wireless networking is significantly slower than wired networks. The most popular wireless standard currently in use is 802.11g. This standard allows for 54 Mbs (Mega bits per second) of data. Like all advertised specifications, this is fastest possible burst of data under ideal conditions. Realistically, you can expect speeds of 13-20 Mbs. The upcoming industry standard of 802.11n allows for an advertised speed of up to 300 Mbs, translating to about 40 Mbits of actual throughput.

By comparison, the trusty Ethernet wired standard we all grew up with allows speeds of up to 1000 Mbs. What's more, wired ethernet supports full duplex operation, meaning that you can actually get up to 2000 Mbs out of a standard wired network. This means that wireless b is 50-100 times slower than a wired network.
Many manufacturers have developed proprietary standards that will give you faster speeds and longer range. The problem with these is that you would need to purchase all of your networking equipment from the same manufacturer. Even equipment purchased from the same manufacturer but at different times is not guaranteed to be compatible at the extended speeds.

With all of that said, the 54 Mbps provided by 802.11g networks is usually more than enough speed for home networks. With most cable internet connections in the range of 1.5 - 15 Mbps, the wireless g standard should provide plenty of speed for surfing the net. It really doesn't take much bandwidth to surf the web or read email, and many people never notice the speed difference of their wireless network from a wired one.

2. Radio interference - Certain types of strong radio signals could interfere with your network. Some common types of interference are cordless phones, microwaves, and ham radios. This type of interference is becoming less and less of a problem as routers improve and cordless phones move to other frequencies, but it is still something you may have to deal with.

3. Distance - Your signal quality (and the speed of your wireless connection) will decrease as you get farther from your router. While wired ethernet allows a wire to go up to 100 meters before the signal must repeated, a typical wireless connection only goes about 30 meters indoors. This can be improved with range extenders or specially built routers. More on that later.

4. Security - Wireless security was the inspiration for this article. Since your network is being broadcast as radio signal in all directions, anyone within range can tune in. The neighbors next door or even people driving down the street with lap-tops will be able to connect to your network, access your files, and use your internet connection. I will show you steps you can take to lock down your wireless network to keep unwanted visitors out, but there will always be risks.

For many people, including me, the advantages of flexibility and easy installation outweigh the disadvantages of wireless networking. If you are one of those people, read on to see how to set it up.

Wireless Networking Basics

2009-05-26T03:14:00.000+07:00

Most wireless networks are based on the IEEE® 802.11 standards. A basic wireless network consists of multiple stations communicating with radios that broadcast in either the 2.4GHz or 5GHz band (though this varies according to the locale and is also changing to enable communication in the 2.3GHz and 4.9GHz ranges).

802.11 networks are organized in two ways: in infrastructure mode one station acts as a master with all the other stations associating to it; the network is known as a BSS and the master station is termed an access point (AP). In a BSS all communication passes through the AP; even when one station wants to communicate with another wireless station messages must go through the AP. In the second form of network there is no master and stations communicate directly. This form of network is termed an IBSS and is commonly known as an ad-hoc network.

802.11 networks were first deployed in the 2.4GHz band using protocols defined by the IEEE 802.11 and 802.11b standard. These specifications include the operating frequencies, MAC layer characteristics including framing and transmission rates (communication can be done at various rates). Later the 802.11a standard defined operation in the 5GHz band, including different signalling mechanisms and higher transmission rates. Still later the 802.11g standard was defined to enable use of 802.11a signalling and transmission mechanisms in the 2.4GHz band in such a way as to be backwards compatible with 802.11b networks.

Separate from the underlying transmission techniques 802.11 networks have a variety of security mechanisms. The original 802.11 specifications defined a simple security protocol called WEP. This protocol uses a fixed pre-shared key and the RC4 cryptographic cipher to encode data transmitted on a network. Stations must all agree on the fixed key in order to communicate. This scheme was shown to be easily broken and is now rarely used except to discourage transient users from joining networks. Current security practice is given by the IEEE 802.11i specification that defines new cryptographic ciphers and an additional protocol to authenticate stations to an access point and exchange keys for doing data communication.

Further, cryptographic keys are periodically refreshed and there are mechanisms for detecting intrusion attempts (and for countering intrusion attempts). Another security protocol specification commonly used in wireless networks is termed WPA. This was a precursor to 802.11i defined by an industry group as an interim measure while waiting for 802.11i to be ratified. WPA specifies a subset of the requirements found in 802.11i and is designed for implementation on legacy hardware. Specifically WPA requires only the TKIP cipher that is derived from the original WEP cipher. 802.11i permits use of TKIP but also requires support for a stronger cipher, AES-CCM, for encrypting data. (The AES cipher was not required in WPA because it was deemed too computationally costly to be implemented on legacy hardware.)

Other than the above protocol standards the other important standard to be aware of is 802.11e. This defines protocols for deploying multi-media applications such as streaming video and voice over IP (VoIP) in an 802.11 network. Like 802.11i, 802.11e also has a precursor specification termed WME (later renamed WMM) that has been defined by an industry group as a subset of 802.11e that can be deployed now to enable multi-media applications while waiting for the final ratification of 802.11e.

The most important thing to know about 802.11e and WME/WMM is that it enables prioritized traffic use of a wireless network through Quality of Service (QoS) protocols and enhanced media access protocols. Proper implementation of these protocols enable high speed bursting of data and prioritized traffic flow.

Since the 6.0 version, FreeBSD supports networks that operate using 802.11a, 802.11b, and 802.11g. The WPA and 802.11i security protocols are likewise supported (in conjunction with any of 11a, 11b, and 11g) and QoS and traffic prioritization required by the WME/WMM protocols are supported for a limited set of wireless devices.

Wireless Booster | HSDPA Technology

2009-05-23T01:09:00.000+07:00

RF Design now available for GSM Network. As all you now that 3G and HSDPA Technology using RF too. I know that this connection not like wireless or cable network about the speed, but when we talk about range and distances this technology is the best at this time. Wide range and high speed connection until 7.2Mbps can make us connected through the internet at anywhere and any places.

Wireless LAN now is so famous and keep develop by large Network vendor and using also some consultant hired for their RF Design services. There are many kind of Wireless device to use for Local Area Network Connection and as long as I know it’s not that good as a cable LAN. Right now, Cable LAN already has 1Gbit and it’s fast. But when you need for outdoor, I don’t think I’m going to use Cables for my network, because it’s so bothering me and need a lot of time to prepared. This is one of the wireless ability that I like and maybe you like too.

So, everything has his own capability for some reason, when we need high speed Local connection we use cables, at the medium range we have Wireless technology, and also if we need wider range we have 3G and HSDPA with GSM Network to full fill our needed. Everything depend on the condition and what we need, I hope now you have more knowledge about RF (Radio Frequency), Wireless, and cable Network technology.

Homebrew Helical Antenna

2009-05-20T03:27:00.000+07:00

Helical antennas are among some of the simplest antennas to build. All that is required is a wire for the element and some sort of flat metalic reflector. A non conductive former like cardboard or plastic or some other form of support to hold the element in place.

The rule for helical antennas basically simplifies down to these rules. The diameter of the element is 1/3 of a wavelength. For 2.5GHz this is about 40mm. The spacing between turns is 1/4 of a wavelength. For 2.5GHz this is about 30mm. Helical antennas are CIRCULAR polarisation. They are both horizont and vertical polarisation, but 90 degrees out of phase from each other.

Circular polarised antennas are 100% compatible with linear polarised antennas. A circular polarised will receive both horizontal and vertical at the same time. Likewise, Both polarity linear antennas will receive signals that are both LHCP (Left Hand Circular Polarised) and RHCP (Right Hand Circular Polarised).
Where as linear antennas have about 20db isolation between polarities, circular polarisation has about 30db between polarities.

Circular polarisation also has some other advantages. The polarity is not orientation dependant. This means that you can rotate the antenna on it's axis in the direction it is pointing and it will always be the same polarisation. This is ideal for satellites, as long as the antenna is pointed at its target, it does not matter how the spacecraft is orientated. It saves on a bit of fuel. For terrestrial communications it is useful as L,S,C band often suffer from polarity shifts, where horizontal polarity is shifted to vertical polarity by something in the atmosphere. A 90 degree phase shift of circular polarisation is still circular in the same polarity.

When a circular polarised signal is reflected, it's polarity changes ! RHCP becomes LHCP. This is very helpful if you want to try eliminate (odd numbered) reflections. Or, you could apply the reverse, where you only want to see the reflected signal, like in radar or bouncing the signal of some intermediate object.

To Construct a helical Antenna
Construct a helical antenna take your former and make out 1/4 wavelength spaces up the length of the tube. You might also consider doing it on the other side of the tube, but add an extra 1/8th of a wavelength to get the turns phasing correct.

I use tape to hold my wire element in place at first and then glue it in perminantly with 5 minute epoxy. If you are starting at the place where the conector is and winding outwards. If the sprial winds out clockwise it is RHCP, it it winds out anti-clockwise, then it will be LHCP.

Once you have reached the end of the former, cut off the remaining wire and glue the lot into place. Attach the coax connector core to the element. The shield of the coax connects to the reflector. I prefer to mount my connector onto the reflector directly, then attaching the former and soldering the wire element to the center conductor.

The antenna should not require tuning if everything is close to the mark, these antennas are quite broadband. If you do still have problems, you can try and solder a thicker piece of wire in the first 3cm of the helix to act as a matching stub. If this fails to work, you might like to consider a gamma match, though I have never personally had to go that far.

This is a four and a half turn helical antenna I built for L band. It is used mainly for amateur radio fox hunts, but it works well as a transmit antenna with a VSWR of 1.6:1. No tuning. I chose to put the element on the inside of the cardboard former to help protect it and I taped up the outside with electrical tape to protect the cardboard from rain/snow during foxhunting events
This antenna is Right Hand Circular Polarised

Made It Self Antenna Flat Pannel

2009-05-13T02:20:00.000+07:00

This panel antenna delivers extended access point range in a single floor environment ideally positioned in the corner of a building. It functions from point-to-point so that you can wirelessly connect LANs between the buildings in a campus-type environment. It provides multiform transmission when placed on a ceiling, as the higher powder output extends the range through typical flooring materials.

Designed for wireless LAN communications
Mounts easily for indoor or outside applications
Designed to obtain maximum gain
Made with weatherproof and corrosion resistant
There is a mounting kit with panel antenna

You can make it this antenna by your self. I was made the picture file with the coreldraw, so you just open it with coreldraw and print it. It make it easy to you for gain high signal wireless from far away access point.

Download File Antenna

This is Specification of Antenna Flat Pannel

Frequency 2400-2483 MHz
Gain 18dBi
Polarization Vertical
Beamwidth degree Horz.35° Vert.18°
(Vertical & Horizontal)
VSWR 1.5:1
Impedance 50 Ohm

Dimensions

Size L263 x W263 x H50 mm
Weight 1810 g
Connector N - Type / Female

Review Linksys WRT54GL Wireless-G

2009-05-10T14:00:00.000+07:00

Linksys WRT54GL Wireless-G

The Linksys Wireless-G Broadband Router is really three devices in one box. First, there's the Wireless Access Point, which lets you connect both screaming fast Wireless-G (802.11g at 54Mbps) and Wireless-B (802.11b at 11Mbps) devices to the network.

There's also a built-in 4-port full-duplex 10/100 Switch to connect your wired-Ethernet devices together. Connect four PCs directly, or attach more hubs and switches to create as big a network as you need. Finally, the Router function ties it all together and lets your whole network share a high-speed cable or DSL Internet connection.

Once your computers are connected to the Router and the Internet, they can communicate with each other too, sharing resources and files.

All your computers can print on a shared printer connected anywhere in the house. And your computers can share all kinds of files -- music, digital pictures, and documents. Keep all your digital music on one computer, and listen to it anywhere in the house. Organize all of your family's digital pictures in one place, to simplify finding the ones you want, and easing backup to CD-R. Utilize extra free space on one computer when another's hard drive starts to fill up.

The new push button setup feature makes it easy to configure your wireless devices. Just push the button on the router and on your other SecureEasySetup-enabled wireless device to automatically create an encryption-secured wireless connection. TKIP and AES protects your data and privacy with up to 128-bit industrial-strength encryption. The Router can serve as a DHCP Server, has a powerful SPI firewall to protect your PCs against intruders and most known Internet attacks, supports VPN pass-through, and can be configured to filter internal users' access to the Internet.

Advanced configuration is a snap with the web browser-based interface. With the Linksys Wireless-G Broadband Router at the center of your home or office network, you can share a high-speed Internet connection, files, printers, and multi-player games with flexibility, speed, security and simplicity!

Product Description
The Linksys WRT54GL Wireless-G Broadband Router combines the functionalities of three devices into a single device, a wireless access point, a four-port full-duplex 10/100 Mbps switch and a router. The wireless access point lets you connect Wireless-G or Wireless-B devices to the network while the switch connects your wired-Ethernet devices together.

The router function ties it all together by letting your whole network share a high-speed cable or DSL Internet connection. The push button setup feature makes it easy to configure your wireless devices. The router serves as a DHCP server, includes an SPI firewall to protect against Internet intruders and also supports VPN pass-through. The WRT54GL even features TKIP and AES to protect your data and privacy with up to 128-bit encryption.

With the Linksys Wireless-G Broadband Router at the center of your home or office network, you can share a high-speed Internet connection, files, printers and multi-player games with flexibility, speed, security and simplicity. Status Indicators - Port status, link activity Compliant Standards - FCC IEEE 802.3, IEEE 802.3U, IEEE 802.11b, IEEE 802.11g Data Link Protocol - Ethernet, Fast Ethernet, IEEE 802.11b, IEEE 802.11g Interfaces - 1x network - Ethernet 10Base-T/100Base-TX - RJ-45 ( WAN / DMZ ), 4 x network - Ethernet 10Base-T/100Base-TX - RJ-45, 1 x network - Radio-Ethernet Dimensions - Height 4.8 cm x Depth 20 cm x Width 18.6 cm Weight - 0.5 kg

Review Linksys WUSB54G Wireless-G USB

2009-05-09T17:00:00.000+07:00

Linksys WUSB54G Wireless-G USB Adapter.

The easy way to connect your desktop or notebook to a high-speed wireless network Connect your USB-equipped desktop or notebook computer to a wireless network at incredible speeds with the Linksys Wireless-G USB Network Adapter. By incorporating two new, blazing fast technologies -- USB 2.0 and Wireless-G -- the Adapter delivers data rates up to 54 Mbps (5 times as fast as 802.11b), without the trouble of opening up the case of your desktop computer.

To install, simply plug the Adapter into any available USB port. (It's compatible with both USB 1.1 and 2.0 ports, but 2.0 will yield the fastest speeds.) It gets its power through the USB connection, so no power cord is necessary. The included Setup Wizard walks you through configuring the Adapter to your wireless network settings, step by step. The Wireless-G USB Network Adapter is also compatible with the Wireless-B (802.11b) network standard, with data rates up to 11 Mbps. And your wireless communications can be protected by 128-bit encryption, so your data stays secure.

The Wireless-G USB Network Adapter's high-gain antenna lets you put your computer almost anywhere in the building, without the cost and hassle of running cables. Now you don't have to drill holes in your walls and climb through the attic or cellar to get connected to the network. Once you're connected, you can keep in touch with your e-mail, access the Internet, use instant messaging to chat with friends, and share files and other resources such as printers and hard disk storage space with other computers on the network.
So don't hassle with running cables through your house -- get connected the easy way with the Wireless-G USB Network Adapter.

Wireless networks are rapidly becoming more popular and coming down in price. Since they don't require cables, you can use the devices anywhere in an office or home, even out on the patio. There's no need to roll out an Ethernet network cable to each room of a house; you can network anywhere -- without wires. Outside of the home, wireless networking is available in hotspots at coffee shops, businesses, airports -- great when you're on the road and need to get some work done. For convenience, wireless networking is the answer.
Now that you've decided to create a wireless network, the next step is to figure out which wireless standard to use.

Basically, a standard is a set of specifications for a device. All devices that follow a specific standard share operating characteristics, such as the radio frequency used and maximum data transfer speed.

For wireless networking, there are three standards to choose from at this time:

802.11b
802.11a
802.11g
802.11a/g

Extended Antenna to the D-Link DWL-650+

2009-05-07T04:00:00.000+07:00

The DWL-650+ has metal locking strips running down each side of the case holding the top and bottom sheilding in place. The locking strips must be moved to the rear of the card about 1mm and prised away from the plastic case. A jeweller's screwdriver set is very handy for this job.

Once the metal locking strips have been removed, the top and bottom covers may be removed.

Immediately noticable on the top side of the card is the presence of an external antenna socket.

We will be removing this socket completely thereby disconnecting the second dipole antenna on the PCB. The pigtail leads will be attached to the solder pads underneath this socket. After removing the top and bottom covers of the card, it is probably in your best interests to remove the PCB from the plastic housing. Doing so requires you to break the plastic casing somewhat. Prise up the bottom half of the plastic housing and separate it from the top half. Be careful and later, the two pieces can be glued back together for a good finish.

After removing the plastic housing, you are left with just the PCB.

Looking at the half of the PCB previously covered by the plastic housing, we can see that there are two antenna paths. We will be leaving antenna 1 alone and modifying the card so that antenna 2 is our external antenna. It was suggested that the existing antenna socket be removed and the pigtail connected to the solder pads underneath.

Whilst removing the antenna socket, be careful not to damage the solder pads underneath.These are necessary to attach the pigtail leads to. One of the pads came off the PCB with the socket and I ended up having nowhere to attach the pigtail lead. In the end, I traced back the solder pad to a couple of capacitors and one end of each capacitor provides an alternative connection for antenna 2.

A thin piece of insulated hookup wire was used to connect to one of these capacitors through a very small hole drilled with a dremel tool through the side of the shield box. This hole was just big enough to allow the wire to pass through.The sheild top will also need to be filed gently to accomodate the wire running into the sheild box.

The following pictures show the successful connection to the capacitor.

I chose to route the pigtail through the rear of the card to give the finished modification as much of a professional touch as possible! To allow the pigtail to exit from the rear of the card, the cable used must be fairly thin so that the two halves of the plastic housing can be glued together. The plastic housing must also be drilled out and filed down to allow the cable through.

Finished modification

This is a picture of the finished PCB modification and the final product. Please note that the sheild cover was removed for the following picture but must be replaced when reassembling the finished product.

POE Homebrew

2009-04-22T02:14:00.001+07:00

This post has continued my older post about POE (Power Over Ethernet), with this post I wanna show you how to make POE yourself.

Look at this pic...

This pic below show you how to injection AC adapter in Cable RJ45 to router wireless, if you don't really understand, just see this pic.

Explaination:
Actually from 8 single cable on the cable RG45, only 4 wires are used as a data drive, as shown above only the blue wire, blue white, green, and white green cable are used to deliver data, and the rest we can use to inject power from the adapter, and here I use a brown and white brown wires as injection power from the adapter to the router wireless.

WiFi Cheap | Wireless Signal Booster

2009-04-19T00:48:00.000+07:00

I have built and used similar signal extenders for my radio frequency projects on numerous occasions to great effect. Typically I use these for point to point communication between some rather devious devices, my spy foam gun turret for instance being one of the lesser of these evils. As such this is easily adaptable to booster signal wireless

I shall try to be as descriptive as possible with this build for those that have never done it before can follow along.

First, you need some tools and part. You need only a few parts for this project and they all are pretty cheap except for the USB WIFI adaptor. ( I got mine on sale for $10, just check it out ). Metal strainer, USB WiFi adapter, USB extension cable, drill bit, some glue, and ties.

Second, okey now if you complated with the part and then remove the center post (If your's had one) and drill a 1/2" hole as that is perfect size to fit the usb extention. Then insert the female end of the USB extention into the hole you just drilled. Apply the glue in front and back of the strainer and let it sit for some hour. And make sure it creates a strong bond between the plastic and metal.

Third, make sure to not get any glue in the USB socket in USB extended or the adaptor wont fit. Then just plug the USB WiFi adaptor into the socket on the dish and plug the other end into the computer. Enjoy boosted signal strength and improved distance. Check signal strength with Netstumbler of kismet to really see the gain in power. This works wven better than I thought it would.

Last, you can make the dish mountable in roof, or tower, or you can make in to tripod. So be sure to leave your comments on how well it worked. Now I said works great for war driving.

Easy Homemade 2.4 Antenna Wireless

2009-04-15T03:29:00.000+07:00

Most of the designs on the web for 2.4 Antenna Wireless seem to involve brass tubing and lmr-400 cable, none of which are readily available to me. I then found a coax only design for 444Mhz that was based on the same idea. The only reasonable cable I could get my hands on was RG-213 from Maplin. By scaling the 444Mhz design up to 2.4 Antenna Wireless and using RG-213 I thought I'd have a go.

In order to get about 6db gain from the antenna, it would need 8 sectors, with a 1/4 wave section at the top and a fly-lead with N-connector at the bottom. It should take about 2-3 hours to build an antenna using this design, but don't worry if it takes longer, you will get quicker, especially as you only need to make the jig once.

Most of the designs either had toroid magnets or a decoupler on the fly-lead of the antenna. However the location of the decoupler seems different in each design, and some designs quoted a decoupler length of 1/4 wavelength, others were !/4 wavelength times the velocity factor of the decoupler tube (brass tube quoted at 0.95).

I've tried most locations and can report that without proper testing kit I can see no difference in the Signal to Noise ratio between having a decoupler and not. I decided to not bother as it simplified the design. If anyone knows a good reason why you must have a decoupler then I would love to know (especially if you know where it should be exactly).

If you want to add a decoupler, please do, I found using 15mm or 22mm copper tube and a 15mm or 22mm end stop made a good design, just needing to be soldered together to get the right length, and a hole drilled in the end of the end stop to fit the cable.

Each sector of the Omni Antenna needs to be a 1/2 wavelength long multiplied by the velocity factor of the cable. The velocity factor of RG-213 is 0.66 . If you decide to use different cable (such as LMR-400) then you need to get the velocity factor of that cable (which will be different), and recalculate all the dimensions.

V * C 0.66 * 299792458
1/2 wavelength = ------ = ---------------- = 0.0405m = 40.5mm
2 * F 2 * 2441000000

V = Velocity Factor of RG213 = 0.66
C = speed of light = 299792458
F = Frequency of Signal = 2441000000 (middle of 2.4ghz range)

The 1/4 wave element is not adjusted by the Velocity factor, as it is in the open, so works out at just 31mm long giving a total antenna length of 355mm + fly-lead.

Shopping Wiki Electronic Online

2009-04-14T06:38:00.000+07:00

On developed countries, shopping online is not that new anymore. Because with online shop is no longer a problem with the scarcity of the product. But how many of the sellers who actually have products that match your needs, providing enough information that can be trusted or enough? Yes, you guess it - very little. What every consumer, especially who want to buy electronic products must find shopping a deal and check the site or search engine that truly reflect consumer responses - a consumer that is generated and aggregated content. One of the good shopping search engine and wiki I introduce you all today is ShopWiki.com

ShopWiki is a web site online for a visit by buyers who want to start shopping online, research products, compare deals, reviews and suggestions - they all produced by consumers and collected from the Internet based on searches made by consumers. They do not sell anything, but enough to give relevant information to help you make the best choices and act.

On the part of the product ShopWiki Electronics is very useful to find buyers to purchase the latest gadget, the cell phone accessories, home theater system and television/LCD, digital camera or home consumer electronics. Also find information about many products such as office network Wireless Access Point WAP54G.

ShopWiki who have built into an online store that is able to provide product information and act on product search and a more finely filtered by other consumers in Wiki format. It's not like other shopping engine which receives money from the merchants to list their products. So theoretically, you have the ability to search more than 120 million of products from different stores (180,000 +).

Quality is the editor in the ShopWiki moderate, the contribution in the Wiki to keep information that is rich and useful, so that consumers like you can benefit from their services. If you find that your favorite product is not listed, you can ask for in the list to masukkannya to be explored; make shopping search and product comparison more complete service and offer better results.

Consumers can browse from the brand or category in the directory easily. So what are you waiting for? Register now at Shop Wiki and start sharing your own experience as well, in addition to their free use comparison shopping search engine.

Parabolic Wifi Reflector | Wireless Signal Booster

2009-04-12T02:50:00.000+07:00

A parabola can be used to concentrate radiation from an antenna located at its focus to form a beam in the same way that a searchlight reflector produces a light beam. The reflector creates a large surface area that the antenna uses to receive and transmit signals like the wireless booster. This type of antenna is a unidirectional antenna, meaning that is transmits in one specific direction.

The Primestar is an oblong shaped parabolic reflector that is a high gain, low cost surplus or possibly free dish with an offset feed (offset in order to be out of the way of the incoming signal). Attach a coffee can antenna as the offset feed horn to your Primestar. Mount the entire anntenna securely to make sure it doesn't move. (Note to hams: a cheap motorized rotator from an older satellite TV dish could be fitted on the end of the feed horn boom-arm to rotate your home-brew feed horn for optimal polarization.) If you're using a solid parabolic grid antenna and live in an area where high winds are common, you may want to consider replacing it with a mesh dish in order to prevent potential wind damage.

According to Martin, the biquad antenna is "easy to build", and provides a reliable 11dBi gain, with a fairly wide beamwidth. A parabolic antenna will give you good range for your signal, however, they are more challenging to aim correctly due to the fact that they have a narrow beamwidth and signals arrive and exit at an angle. Dish antennas are mostly used for a point to point system for long haul systems. Plug in your numbers at Parabolic Reflector Analysis to view gain and beamwidth. Determining the focal length of a parabolic dish and Calculating a Parabolic Dish’s focal point are useful.

Here are instructions for a Primestar dish biquad feed. There is a European Dish version. Engadget's biquad version has plenty of pictures. Check out the simple modification using a US standard aluminum soda can!

Cheap USB WiFi adapters, icon in conjunction with reflective parabolic cookware (woks, steamers, sieves etc., can offer a cost effective alternative
* The USB Wifi adapters can readily be mounted at the focal point of suitable parabolic reflectors.
* All the signal decoding is done right in the USB Wifi adapter, so no cable losses occur.
* USB Wifi adapters are cheap, although their power output may be low.
* Regular cheap USB extension cables & connectors can be used.
* Easily swaps out for testing assorted reflectors & adaptors.
* Gains of 1~12dB at minimal cost can extend line of site (LOS) ranges to several km.

F(ocus)/D(iameter) ratio desirability is 0.25-0.55 for a shallow parabola. For example if you have a 300mm (12in) diameter, 60mm depth to center diameter.The strainer/steamer reflector doesn't have the numbers. This 8dBi directional USB wireless-g adapter dish antenna is a better choice for many people.
For Australians there is Eric's Mod for an Austar 2.195GHz MDS dipole and antenna. Step-by-step of parabolic reflector template for a wireless router antenna.

Roof Mounts
It's important to consider antenna grounding and lightning protection for tower and roof mounted antennas. For a tower, there should be a good ground wire attached between the tower base and earth ground. For roof-mounts, the mast should be grounded to the steel structure of the building. Alternatively, run a large diameter wire from the mast directly to earth ground. Lightning protectrs should be added to the coax cable between the antenna and the wireless access point.
The Fresnel Zone is the area around the visual line-of-sight that radio waves spread out into after they leave the antenna. You want a clear line of sight to maintain signal strength, especially for 2.4 GHz wireless systems. This is because 2.4 GHz waves are absorbed by water, like the water found in trees.

POE - Power Over Ethernet

2009-04-09T03:37:00.000+07:00

PoE basically "injects" power into an ethernet cable at the source, and "picks" off that power at the destination. The power "injector" and "picker" can be external adaptors or can be "embedded" into the devices themselves. Either way, the destination device is completely powered by the ethernet cable, no extension cord or outlets required.

Many applications benefit from electrical power sent over ethernet cables. This avoids a separate power cord for things like internet phones and wireless access points. Fortunately and unfortunately, there are several ways to do this. Fortunately you have several choices, unfortunately they are not all compatible. Fortunately you are at the right place to sort out the confusion between standards.

There are basically three methods of sending PoE on the ethernet cable:

First type of PoE, using "data" wires. The IEEE (Institute for Electrical and Electronics Engineers), same folks who standardized Ethernet itself, standardized PoE in June 2003. The IEEE 802.3af standard uses the same "data" pairs as ethernet, leaving the "spare" pairs free. This PoE adds DC power to the data pairs using signal transformers, and pickes off power at the far end the same way. A comprehensive set of technical standards for Power Sourcing Equipment (PSE) and Powered Devices (PD) create an "idiot proof" system protected from shorted wiring, polarity reversal, or accidentally plugging in non-PoE equipment. IEEE 802.3af is technically complex and best implemented with power management chips specially designed for the purpose, supplied by Dallas, Maxim, Linear Technology, Texas Instruments, and others, that are intended to be embedded into the PoE devices themselves. Expect PoE device makers using their own standard to migrate to IEEE 802.3af in the future.

Second type of PoE is a combination of the two. The new IEEE 802.3af standard alternatively allows the "spare" wire pairs to be energized, to be compatible with both types of wiring. You may mix 802.3af with older or homebrew PoE devices, but the result may not be "idiot proof". If your mixed network has only PoE sources that are IEEE 802.3af compliant, your mixed network is pretty safe from damage, but older devices may or may not operate correctly. This mixed PoE allows brands to migrate to the common standard.

Third type of PoE, using "spare" wire pairs. The Unshielded Twisted Pair wiring (UTP) for ethernet has 8 wires, twisted in 4 pairs. Ethernet connects to only two pairs for data, leaving the other two free. Simply using the "spare" pairs is the hands-down most economical and efficient way to do PoE. But, beware of incompatible standards for polarity and voltage, which vary from brand to brand. More info below. Beware also, some other devices, such as ordinary analog phones, may already be using the "spare" pairs in your network. Also, if you plug your laptop or some kind of non-PoE ethernet device into a port energized with PoE, it may or may not harm your devices. All homebrew and many commercial PoE devices use the "spare" pairs in UTP wiring, and it is the absolute fastest and easiest way to adapt a non-PoE device to use PoE.

If you are merely a consumer, any IEEE 802.3af compatible device will work with any other. If your PoE devices are not IEEE 802.3af compliant, best stick with one brand, or at least with PoE devices known to be compatible with your favorite brand. More info below. If you are comfortable working with low voltage, you have come to the right place to sort out the various standards and roll-your-own PoE network.

External Antenna WUSB54G | Booster Signal Wireless

2009-04-03T18:25:00.000+07:00

I was looking for a USB-connected WiFi-Adapter to keep the antenna-cable short. I chose the Linksys WUSB54G v4 because it is not too small to modify and uses a Ralink 2570 chip: there are GPLed drivers for Linux available. This is the unmodified WUSB54G. And you will see how to booster signal wireless this WUSB54G

There are two drivers available: rt2570 is the stable version while rt2x00 is the development version based on the new devicescape stack. You can get both at http://rt2x00.serialmonkey.com/. I got both to work, but less problems with the stable one. If your are playing with monitoring (kismet, airodump, etc.) or injecting packets (aireplay), you should check out the CVS version of the stable driver or a specially patched one at http://homepages.tu-darmstadt.de/~p_larbig/wlan/. These can inject packets and show the signal strength.

But now on to replacing the included antenna with a universal RP-SMA connector.
If you want to open it, you first have to open the screw hidden under a rubber pad below the antenna. After that you can carefully open the case. Only version 4 of the WUSB54G uses a Ralink chip. If you are buying one on eBay, you can ask the seller to look at the version tag marked yellow in the picture.

I carefully de-soldered the original antenna using a soldering iron and a de-soldering pump. Be careful not to overheat the board or accidently create a connection between the antenna ground (the thick connectors) and the small SMD-capacitor just above.

Then I took a regular anything-to-RP-SMA pigtail and cut the anything-part off. Now I could de-isolate a small part of the cable and put a bit of tin-solder on it. The next step was soldering the cable onto the board: The shielding to big ground connectors and the core to the small pad next to the shielded chip.

I could not re-use the hole of the original antenna because the connector would have blocked the screw holding together the case. So I had to carefully drill a new hole into the side and tie the RP-SMA connector there.

You can add an external antenna that you want.

This is the final WUSB54G with antenna connector and in action with a simple 7dBi omni antenna.

External Antenna Asus WL-167G | Wireless Signal Booster

2009-04-01T22:33:00.001+07:00

External antenna for ASUS WL-167G USB WLAN adapter can be modify with external antenna for wireless booster

First you must remove the plastic case:
Just only plastic click-on (3 times at each long side). The part with the LEDs and "ASUS" is the cover that snaps over the bottom. Just Cut the labels. Push and lift with a knife each "ASUS" side away from the bottom, starting from a corner e.g. from the holes for the neck lace.

Remove the blue component at the top of the board.

The easiest way to remove this part is to cover both ends of the smd component with much solder, so both ends are heated and it can be removed easily. Now prepare the board for the reverse-SMA jack.

Drill a hole in the board which fits the pin of the reverse-SMA jack. The best location for this hole is below the position, where you removed the blue antenna. You can see a little white triangle below one of the soldering joints, drill exactly in this triangle.

Here you can see an image of the drilled board.

Grind the reverse-SMA jack, so it fits on the board without overlapping.

Isolate the bottom of the jack, so no shortcuts occur when you put it on the board.

Use duct-tape or plastic foil or something similar and adapt it to the size if the jack.

Assemble the jack on the opposing side where the blue antenna was mounted, so the pin is on the side, where the antenna was mounted, just below the soldering-joint. Then solder the pin to the soldering joint just above the drilled hole.

Trim the pin to a appropriate size.

Secure the jack at the edges with some epoxy, so external forces do not directly affect to soldering joints.

Now remove some of the varnish (e.g. with a dremel multi tool) of the board (where no circuit paths are printed) near to the jack, to get a point where yo can solder a wire to ground of the board. Solder this wire also to the jack (on the right side of the board, below the jack).

You're almost done, just drill a hole in the plastic case where the reverse-SMA jack fits throug - done.

Antenna Gain Wireless

2009-03-26T19:00:00.000+07:00

In a wireless system, antenna are used to convert electrical waves into electromagnetic waves. The amount of energy the antenna can "boost" the sent and received signal by is referred to as the antenna Gain.

Antenna gain is normally given in isotropic decibels [dBi]. It's the power gain in comparison to an isotropic antenna (antenna that spread energy in every directions with the same power....theoretical view it doesn't exist in reality!).
Some antennas have their gain expressed in Desible [dBd], it's the gain compared to a dipole antenna. In this case you have to add 2.14 to obtain the corresponding gain in [dBi].
The more an antenna has gain the more it is directive (wave sent in a preferred direction).
Antenna coming with WLAN kits are generally without much gain (2.14 dBi ).
Antenna gain is the same for transmit and receive

Parabolic antenna:
The parabolic reflector is independant of the frequency, it only affects antenna gain. So it means you can reuse your TV satellite dish for wifi :-)
The higher the gain directivity and so the more accurately it must be pointed.
The big challenge is to illuminate the parabolic reflector correctly. If illumination is too large or to concentrated there will be gain loss.

Antenna gain is measured in:
dBi - relative to an isotropic radiator
dBd - relative to a dipole radiator

The relationship between dBd and dBi can be represented in the following equation
0 dBd = 2.15 dBi
In most cases, we use dBi as our antenna gain measurement.

Problem And Solution for Connection WiFi

2009-03-23T04:41:00.000+07:00

On home or public wireless networks, your Wi-Fi connection might drop unexpectedly for no obvious reason. This kind of networking problem is especially frustrating. It's also more common than you might think. Fortunately, solutions exist. Consult this checklist to determine why it is happening and how to prevent it.

1. Wi-Fi Radio Interference

Radio signals from various consumer electronic products can interfere with Wi-Fi wireless network signals. For example, cordless phones, Bluetooth devices, garage door openers and microwave ovens can each take down a Wi-Fi network connection when powered on. You can move your network equipment or (on home networks) change some Wi-Fi radio settings to avoid this problem.

Solution :
* Change the Wi-Fi Channel to Avoid Interference
* Position Your Router / Access Point for Best Performance

2. Insufficient Wi-Fi Network Range and Power
Even without interference from other equipment, Wi-Fi connections can drop occasionally on devices located near the edge of the network's wireless signal range. Wi-Fi links generally become more unstable with distance. Relocating your computer or other gear is a simple but not always practical solution. Otherwise, consider antenna upgrades and other techniques to improve wireless signal transmission and reception.

Solution:
* Position Your Router / Access Point for Best Performance
* How Can the Range of a Wi-Fi Network Be Boosted?

3. Unknowingly Connecting to the Wrong Wi-Fi Network
If two neighboring locations run unsecured Wi-Fi networks with the same name (SSID), your devices may connect to the wrong network without your knowledge. This can cause the interference and range problems described above. Additionally, in this scenario your computers will lose connection whenever the neighbor network is turned off, even if your preferred one remains functional. Take proper security measures to ensure your computers connect to the right network.

Solution:
* Improve Wireless Network Security

4. Network Driver or Firmware Upgrade Required
Each computer connected to a Wi-Fi network utilizes a small piece of software called the device driver. The Wi-Fi network device driver controls various functions of the Wi-Fi hardware. Network routers contain related technology called firmware. Network drivers and firmware can both become obsolete over time. Upgrading (overinstalling) newer versions of these things can sometimes fix network connection problems. Get free upgrades from the manufacturer's Web sites.

Solution
* Upgrade Router / Access Point Firmware

5. Incompatible Software Packages Installed
Wi-Fi network connections may start failing on a computer due to incompatible software installed and running there. This includes operating system patches, operating system services, and other software that modifies the networking capabilities of the operating system.

Solution:
* Keep records of each time you install or upgrade software on your computers, and be prepared to uninstall any incompatible software you've added recently.

6. Overloading / Overheating the Wireless Access Point
Owners of some wireless routers (and other types of wireless access points) have reported dropped connections during times of heavy network utilization. This can occur during, for example, online gaming or while copying large files. Routers can in theory become overloaded with too much data and fail temporarily. If a router's temperature increases too much, it may also fail until cooled.

Solution:
* Install routers (access points) in places with good airflow.
* Exchange the router for a different unit if the current one doesn't support your usage patterns.

Finally, I hope this post can help any problem of Connection Wi-Fi.

Modify Your Antenna Wlan USB

2009-03-22T01:29:00.000+07:00

Many think that the antenna Wlan USB can not be modified. Because Wlan USB is a tool that already by the factory in such a way as to smaller.

However, the WLAN antenna cable can be modify to be more powerful and can reach a distance even further. If you want to try it, please see the picture below.

When you Wlan have finished the repairs, what you try to trick one above, the contents of the two cable can be soldered to the positive and negative at the antenna in a WLAN USB, after that cable can connect the antenna cable in Wlan USB you can connect them to a greater reflector for distance to reach can be more away.

Actual Speed Of Kind 802.11 X

2009-03-12T04:12:00.000+07:00

The typical peak throughput (sustained data rate) of an 802.11b wireless connection under ideal conditions for end user data is actually 4-5 Mbps. This level of performance assumes a wireless client in very close promixity (within a few meters) of the base station or other communication endpoint. Due to the distance-sensitive nature of Wi-Fi signaling, 802.11b throughput numbers will decrease the client moves further away from the base station.

The theoretical peak bandwidth of an 802.11b wireless connection is 11 Mbps. This is the performance number advertised on 802.11b Wi-Fi equipment, that many people equate with the expected "Speed" of a network. However, this level of performance is never realized in practice due to network overhead and other factors. What then is the actual network speed of 802.11b?

Some proprietary Wi-Fi products based offer "22 Mbps" bandwidth by extending the standard 802.11b signaling technology. Unfortunately, the actual throughput of these networks is not double that of ordinary 802.11b network, although typical peak throughput may increase up to a 6-7 Mbps level.

The large difference between theoretical and actual data rates for 802.11b is due primarily to protocol overhead. Wi-Fi generates a relatively large amount of traffic to maintain connections, coordinate the sending and acknowledgement of messages, and maintain other private state information. Throughput also decreases when interference in the 802.11b signal range (2.4 Ghz) is present. Interference often causes re-transmissions due to data corruption or packet loss.

While peak data rates may be acheivable at times, many 802.11b home network links typically run at 2-3 Mbps. This is still faster than broadband Internet connections, that normally operate at 0.5-2 Mbps peak for downloads. Because the Internet connection is often a bottleneck, 802.11b LAN throughput is effectively reduced to that of the broadband access.

Finally, the perceived "Speed" of a network is determined not only by available bandwidth but also by network latency (see sidebar).

Wireless ISP in Indonesia

2009-03-11T00:04:00.000+07:00

This is Wireless ISP for home user.
Like RTRW NET of other big Wireless ISP. If You wish to join with Wireless ISP, just call or view the site.
-Thanx-

Wireless ISP BANDUNG:
BandungWireless
Telp: (022) 70346581

Melsa Net
Jl. Ir H Juanda 43 A
Telp: (022) 420 9418
Link http://www.melsa.net.id

RW10.NET
Jl:fakfak 4
Antapani
Telp: (0812) 2333374

Quasar
Jl. Palasari no 9A
Telp: (022)7333633
Link http://quasar.net.id

Wireless ISP BALI:
Bali Medianet
Jl. Tukad Batanghari No. 88 Panjer
Denpasar
Telp: (0361)7421099, 7800299
Link http://www.balimedianet.com

Global Xtreme
Jl.Kerobokan no 388x
Kuta
Telp: (0361)736833, 736822
Link http://www.globalxtreme.net.id

Wireless ISP BATAM:
MNet Wireless
Suite 501A, Graha Pena Bldg. Lt. 5
Jl. Raya Batam Center
Telp : (0778) 469-108, 0811 777245
Link http://www.mnet.web.id

Wireless ISP JAKARTA:
PT. Cakramedia Indocyber
Apartemen Robinson Tower B Lt. 9 Suite 38
JL. Jembatan 2 Raya No. 2
Telp: (021) 66605377
Link http://www.cakramedia.net.id

CBN (Wireless corporate)
Manggala Wanabakti IV, 6th Floor
Jl. Gatot Subroto, Senayan
Telp customer care: (021)5799-4588
Kantor: (021) 5799-4500
Link http://www.cbn.net.id/

Central Online
Menara Kebon Sirih 17th Fl
Jalan Kebon Sirih 17 - 19
Telp: (021) 23550170
Link http://www.central.net.id or http://www.centralonline.net

D~Net (Wireless corporate)
Menara Batavia 6th Floor
Jl. K.H. Mas Mansyur Kav. 126
Telp : (021) 5727218
Marketing : (021) 5709555, (021) 5709333
Link http://www.dnet.net.id

Data Utama Net
Wisma Presisi lantai 2
Jl. Taman Aries Blok A1 No. 1
Telp: (021) 58902040, 5890 2060
Link http://www.datautama.net.id

E-Lini.Net
Perum Lippo Karawaci
Taman Ubud Lestari 1 No.7
Telp: (021) 59497936, (021) 92866976
Link http://www.e-lini.net

E-Skylinx
Apartemen Robinson
Tower B lt. 6 / S18
Jl. Jembatan Dua Raya
Telp: (021) 30841738
Link http:http://www.e-skylinx.net

EZNet
Cyber building, 5th floor
Jl. Kuningan Barat no. 8
Telp: (021) 520 9201
Sales: (021) 7028 0882, 93076797

Tanggerang branch office
Sutra Niaga 3 blok D2
Jalan Raya Serpong, Alam Sutera Tangerang 15310
Telp: (021) 531 24501

Depok branch office
Jl. Raya Margonda no.498B
Telp: (021) 788 82853
Link http://www.ez.net.id/

GradeNet
Cibubur
Telp: (021) 8731268, (021) 92907967

IPNet
Gedung Cyber Lt. 5
Jl. Kuningan Barat N0. 8
Telp: (021) 5275070, 5275072
Link http://www.ipnet.net.id

JF3Net
Graha Simatupang Tower 1B
Jl. TB Simatupang
Telp: (021)93797233, (021)70002057, (021)93119331
Link http://www.jf3net.net

JMTechnics Warnet & Game Center
Jl. Tanjung Duren Raya No. 98B
Telp: (021) 92896677
Link http://www.jmtechnics.com

Mnet Wireless
Menara Batavia Lt.6
Jl. K.H. Mas Masnyur Kav.126
Telp: (021) 53156347, (0815) 1463 6281, 7040 5118
Link http://www.mnet.web.id

Multinet Provider
Telp: (021) 30673448
Link http://www.multinetprovider.net

Nusa Net
Cyber Building, 7Th Floor
Jl. Kuningan Barat No.8
Telp: (021) 5276616
Link http://www.nusa.net.id

Branch office
Kompleks Kalideres Megah A47 (Simpang Swalayan Hari Hari)
Jl. Peta Selatan
Telp: (021) 54373777
Link http://www.nusa.net.id

Wireless ISP JOGJA:
Jogja MediaNet
Jl. Kesehatan Blok K-2 Sekip UGM
Telp : 0274-544000
Link http://www.jogjamedianet.com

Wireless ISP KEBUMEN:
Kebumen MediaNet
Jl. Cincin Kota Gg. Berlian 04 RT02/05
Karangsari
Telp : 0287-5520455

Wireless ISP LAMPUNG:
CENDANA.net
Jl. Cendana No. 12 Rawalaut
Telp: (0721) 253608
Link http://cendana.net/id

Nusa Net
RA Villa Citra Ruko No.6
Bandar Lampung
Telp: (721) 240654
Link http://www.nusa.net.id

Wireless ISP MAGELANG:
Magelang MediaNet
Perum Tidar Indah RT/RW: 01/13
Telp: (0293) 311551

Wireless ISP MALANG:
Global Xtreme
Jl.Retawu no 8
Malang-Indonesia 65112
Telp: (0341) 562000
Link http://www.globalxtreme.net.id

Wireless ISP MATARAM:
Cakrawala Multimedia
Jl.Erlangga no.3
Telp: (0370) 625888
Link http://www.cakrawalamultimedia.com

Wireless ISP MEDAN:
Nusa Net
Wisma BII, 4th Floor Suite #411
Jl. P.Diponegoro 18
Telp: (061) 4158806
Link http://www.nusa.net.id

Wireless ISP PANDAAN:
D~Net
Ruko Candra Sukun A3
Jl. Dr.Sutomo Pandaan 67156
Telp: (0343) 633399
Link http://www.pda.dnet.net.id

Wireless ISP PEMATANG SIANTAR:
Nusa Net
Jl. M.H.Thamrin 129
Telp: (0622) 431599
Link http://www.nusa.net.id

Wireless ISP SEMARANG:
Data Utama Net
Jl. Tri Lomba Juang No. 4
Telp: (024)8453481
Link http://www.datautama.net.id

PT. Sejahtera Globalindo (infoasia Groups)
Hotel Patra Semarang
Jl. Sisingamangaraja Candi Baru
Telp: (024) 8504133, (024) 70794448, (0852) 25451980

PT. Power Telecom (PowerTel)
Rukan Pemuda Mas Blok B Kav 5
Jl. Pemuda No. 150 Semarang
Telp: (024) 3581247
Link http://www.powertel.co.id

Wireless ISP SOLO:
BumiNet
Kompleks Ruko Beteng Blok B8 Solo 57113
Telp: (0271)657627
Link http://www.bumi.net.id

PT. Power Telecom (PowerTel)
Rukan Beteng Blok B 6-7
Telp: (0271) 643547
Link http://www.powertel.co.id

Wireless ISP SURABAYA:
ßeta.net
Perum Nirwana Eksekutif
Telp: (0888) 300 8270

DKent
Telp: (031) 8676736

D~Net
Promenade Arcade, Hyatt Regency Hotel
Jl. Basuki Rachmat 106 -128
Telp : (031) 548-0500
Link http://www.sby.dnet.net.id

EXZONET Wireless Network
Jln. Perumahan Purimas, Gianyar III C5/14
Telp: (031) 70596437
Link http://www.exzonet.info

MNet Wireless
Suite 1003, Graha Pena Building Lt. 10
Jl. A. Yani No. 88
Telp : (031) 829 6250, 0816 67 6770
Link http://www.mnet.web.id

GP Net
Graha Pena Building 11
Jl. Ahmad Yani Street no 88
Telp: (031) 8250077
Link http://www.gpnet.co.nr

Quasar
Jl. Raya Klampis Jaya 39D
Telp: (031)5914600
Link http://quasar.net.id

If there, anything else...
Please comment me..
-Thankx-