Closer Understanding What Is Wifi?

Wi-Fi (or Wi-fi, WiFi, Wifi, wifi) is short for Wireless Fidelity, has a standard set of terms that is used for Wireless Local Networks (Wireless Local Area Networks - WLANs) based on IEEE 802.11 specification. Latest standard specifications 802.11a or b, such as 802.16 g, is currently in preparation, the new specification offers many improvements ranging from broad coverage to further transfer speed.

Wi-Fi originally intended for use of wireless devices and Local Area Network (LAN), but now more widely used to access the Internet. These enable anyone with a computer with a wireless card (wireless card) or personal digital assistant (PDA) to connect to the internet using access point (or known as hotspots) nearby.


Specifications

Wi-Fi was designed based on the IEEE 802.11 specification. Today there are four variations of 802.11, namely: 802.11a, 802.11b, 802.11g, and 802.11n. Specification b is the first product of Wi-Fi. Variation g and n is one product that has the most sales in 2005.
Specifications Wi-Fi
Specifications Speed Frequency
Band Match
with
802.11b 11 Mb / s 2.4 GHz b
802.11a 54 Mb / s 5 GHz a
802.11g 54 Mb / s 2.4 GHz b, g
802.11n 100 Mb / s 2.4 GHz b, g



In many parts of the world, the frequencies used by Wi-Fi, users are not required to obtain permission from local regulators (eg, the Federal Communications Commission in the U.S.). 802.11a uses a higher frequency and therefore a narrower coverage, others the same.

Wi-Fi version of the most extensive in the U.S. market today (based in IEEE 802.11b / g) operates at 2400 MHz to 2483.50 MHz. With so allows operation in 11 channels (each 5 MHz), centered on the following frequencies:

* Channel 1 to 2.412 MHz;
* Channel 2 to 2.417 MHz;
* Channel 3 to 2.422 MHz;
* Channel 4 to 2.427 MHz;
* Channel 5 to 2.432 MHz;
* Channel 6 to 2.437 MHz;
* Channel 7 to 2.442 MHz;
* Channel 8 to 2.447 MHz;
* Channel 9 to 2.452 MHz;
* Channel 10 to 2.457 MHz;
* Channel 11 to 2.462 MHz

WiFi GPS

I spend so much time talking about VoIP killer apps, I figured I would share some info on a WiFi killer app with you. Large enterprises need to track all sorts of things and this is a way for them to inexpensively (relatively anyway) achieve this goal.

Ekahau Announces New Wi-Fi Tag and Positioning Engine Versions

Ekahau Positioning Engine 3.1 calculates more locations per second and supports Ekahau's new T201 Wi-Fi location tag.

Dallas, TX - March 2nd, 2005 - Ekahau, Inc., the leading provider of accurate Wi-Fi positioning solutions and site survey tools, today announced the general availability of the Ekahau Positioning Engine version 3.1, and the second generation Wi-Fi Location-tracking Tag T201.

With these new enhancements, Ekahau can now provide large enterprises a turnkey Wi-Fi RTLS (Real Time Location System) solution, with industry leading accuracy, performance and reliability. The Ekahau RTLS system can be deployed over any standard Wi-Fi network and provides real-time location information of mobile enterprise resources, assets and people.

Large enterprises adopting Wi-Fi for data and voice purposes are creating a natural enabling infrastructure for Ekahau's RTLS solution.

Unlike competing location-tracking systems, Ekahau technology can be easily deployed wherever there is Wi-Fi coverage, without disrupting the facility's daily operation. Especially in the healthcare environment, users are finding that people and asset tracking systems increase productivity and reduce bottlenecks while improving the overall quality of patient care.

"Our customers are looking for ways to deploy asset and people tracking solutions in the fastest and the most cost-efficient manner. These new releases of the Ekahau Positioning Engine and Wi-Fi Tag have substantially improved performance characteristics allowing Ekahau to continue increasing it's market leader role. The solution is easy to deploy and operate. It can begin generating an ROI within weeks of the deployment decision," said Mr. Arttu Huhtiniemi, Director of Product Management, Ekahau, Inc. "The underlying core benefit allows companies to incorporate location information into their existing Wi-Fi infrastructure, seamlessly integrating data, voice and location tracking over one standard infrastructure"

The Ekahau Positioning Engine version 3.1 has been upgraded to support Ekahau's next generation T201 Wi-Fi Tag along with a host of other Wi-Fi enabled devices. It also includes several new improvements, such as multiprocessor support for increased performance for tracking thousands of mobile devices per server, improved algorithms for multi-story and campus wide deployments, as well as a series of new features that improve system deployment and operations.

The new T201 tag has a new smaller design, longer battery life and is smaller in size than its predecessor. It supports Over-The-Air (OTA) configuration over the Wi-Fi network, has a buzzer, LED signaling and a call button for commissioning and decommissioning as well as location-based alarming, for personnel and security use. Ekahau will be showcasing both new products at the RFID World Conference and Exhibition in Dallas on March 2nd and 3rd.

About Ekahau, Inc.

Ekahau, Inc. is the industry leader in location-enabling Wi-Fi networks.
Ekahau's customers include leading corporations around the world that are realizing the benefits of Wi-Fi-based location services and innovative network planning and optimization tools. Ekahau partners include wireless software developers, leading system integrators, and international OEM partners, who develop and market next generation location-based applications. For more information about Ekahau, please visit

Pocket WiFi Radar

Free WiFi on your phone ! This software helps you connect to open wireless access points with a single mouseclick. It's WiFi for Dummies. Get your mail and browse the web without being charged. The ideal WiFi-tool for frequent travellers and mobile professionals. Pocket WiFi Radar will connect to open hotspots automatically and shows you exactly what it is doing in a cool animated radar screen. The iPhone version is not a scanner, but knows 20.000 free hotspots wordwide and leads you them with GPS.

Watch TV, make Skype calls and IM: everything's possible with a free WiFi connection. But if you have ever tried to use the Pocket PC's built-in connection manager, you know what a hassle it can be to quickly check your mail or browse the web on the go.

Pocket WiFi Radar automates all of this. It's main goal is to let you get your mail or surf the web as quickly as possible, without having to go through all of the connection trouble, and without having to pull your creditcard. Just run it and it'll connect you for FREE to the internet. It doesn't get easier than this.

The ideal WiFi-tool for frequent travellers and mobile professionals. Pocket WiFi Radar will connect to open hotspots and automatically get your email or start any program you want. All of that in a cool animated radar screen. You may walk around and it will keep scanning untill it finds a free internet connection for you. It plays a sound and opens your webbrowser as soons as it succesfully finds a open, unsecured access point. But you may also use it to connect to your WEP-secured access point.



Supported Pocket PCs (Windows Mobile touchscreen devices):

Dell Axim X50,Dell Axim X50v,Bouygues Telecom iPDA,Asus MyPal A620BT,Dell Axim X5,HP iPAQ hx2700 Series,HP iPAQ hx2400 Series,HP iPAQ hx2100 Series,AnexTEK SP230,Daxian Telecom CU928,E-TEN P300,E-TEN P300B,E-TEN Pocket PC P700,Samsung M400/M4000,MoviStar TSM500,Qtek 9090,Siemens SX66,Audiovox PPC 6601,Audiovox PPC 6600,Motorola MPx,BenQ P50,T-Mobile MDA III,i-mate PDA2k,i-mate JAM,Audiovox VX6601,HP iPAQ h6340,HP iPAQ hx4700,Qtek S100,T-Mobile MDA Compact,O2 Xda IIs,Garmin iQue M5,Orange SPV M2000,O2 Xda II mini,O2 Xda IIi,Samsung i730,Samsung i830,HP iPAQ h6320/6325,Audiovox PPC 6700 (5.0),Qtek 9000 (5.0),Qtek 9100 (5.0),Qtek S110,Vodafone v1620,T-Mobile MDA Pro (5.0),Symbol MC50,Sprint PPC-6700 (5.0),E-TEN M500,i-mate Jasjar (5.0),i-mate PDA2,Orange SPV M5000 (5.0),Dopod 699,Dopod 700,Dopod 818,HP iPAQ rw6100,Vodafone VPA Compact,i-mate K-JAM (5.0),Dopod 838 (5.0),Dell Axim X51v (5.0),HP iPAQ rx1950 Series (5.0),Verizon XV6700 (5.0),Yakumo alphaX GPS,O2 Xda Exec (5.0),Fujitsu Siemens Pocket Loox,Dell Axim X51 (5.0),Toshiba e830,T-Mobile Pocket PC Phone,O2 Xda Atom (5.0),T-Mobile MDA Vario (5.0),E-TEN M600 (5.0),AT&T / Cingular 8125 (5.0),O2 Xda mini s (5.0),HP iPAQ hw6900 series (5.0),T-Mobile MDA (5.0),Dopod 900 (5.0),Acer n311 (5.0),Dopod 818 Pro (5.0),Vodafone VPA,Vodafone VPA Compact II (5.0),Vodafone VPA III,Vodafone VPA IV (5.0),E-Plus PDA III,E-Plus Pocket PDA (5.0),O2 Xda III,Mio A701,Asus MyPal A636 (5.0),i-mate JAMin (5.0),Mio A201,T-Mobile MDA Compact II (5.0),Qtek S200 (5.0),Acer n50,Garmin iQue M3,Orange SPV M3000 (5.0),E-TEN G500 (5.0),Qtek G100 (5.0),Orange SPV M600 (5.0),O2 Xda Neo (5.0),HP iPAQ hx2100 Series (5.0),HP iPAQ hx2400 Series (5.0),HP iPAQ hx2700 Series (5.0),HP iPAQ hx4700 (5.0),HP iPAQ hx4705 (5.0),HP iPAQ rw6828,HP iPAQ h5100/5400/5500,HTC TyTN,HP iPAQ h1930/1940/1945,Samsung i750,Asus MyPal A639 (5.0),Qtek 9600,FujitsuSiemens Pocket Loox 410,FujitsuSiemens Pocket Loox 420,Symbol PPT 8800,FujitsuSiemens Pocket Loox 610,FujitsuSiemens Pocket Loox 718,FujitsuSiemens Pocket Loox 720,Fujitsu Pocket Loox C550,Fujitsu Pocket Loox N500,Fujitsu Pocket Loox N520,Fujitsu Pocket Loox N560,Fujitsu Pocket Loox T810,Fujitsu Pocket Loox T830,HP iPAQ h2210/2215,O2 Xda Trion,T-Mobile MDA Vario II,HP iPAQ rw6815,FujitsuSiemens Pocket Loox 710,Movistar TSM 500,Grundig GR980,Mio P550,i-mate JASJAM,HTC P3600,HTC P3300,Orange SPV M3100,BenQ P51,Samsung i760,Verizon XV6800,T-Mobile MDA Compact III,HP iPAQ rx5915 (5.0),O2 Xda Orbit,E-TEN Glofiish X500,Dopod 838 Pro (5.0),HTC P4350,Asus P505,HP iPAQ rx4240,HP iPAQ rx5935,Mio P350,Acer n310,E-Plus PDA IV ,T-Mobile Ameo,Vodafone VPA Compact GPS,Mobile Assistant XPA S200,Asus P535,E-TEN Glofiish M700,Grundig GR660,Qtek 2020i,HTC P3350,HTC Advantage X7500/7501,i-mate JAQ3,i-mate PDAL,HP iPAQ rx5700 series,Dopod D810,HTC Wizard,Acer n10,Symbol PDT 8800,HTC P4300,Acer n300,ViewSonic Pocket PC V36,HP iPAQ h4150/4155,HP iPAQ h4350/4355,Samsung i710,Alltel HTC PPC6800 ,ViewSonic Pocket PC V37,HP iPAQ rx5900 series,HTC Touch,T-Mobile Wing,Inventec K871,Sprint HTC Mogul,HTC Mogul,Audiovox 5050,Vodafone v1640,Vodafone v1605,Vodafone VPA Compact S,Vodafone VPA Compact III,Orange SPV M700,T-Mobile MDA Touch,O2 Xda Nova,O2 Xda Terra,i-mate PDA-N,HP iPAQ h4350,i-mate JAQ,i-mate JAMA,Asus MyPal A632,Asus MyPal A730W,Dopod M700,Dopod C800,Dopod P800W,Dopod U1000,HTC P6300,UBiQUiO 401,Dell Axim X30,Dell Axim X3i,Dell Axim X3,UBiQUiO 501 ,UBiQUiO 503G ,HP iPAQ rx3115,HP iPAQ rx3415,HP iPAQ rx3715,Mio 337,Mio 339,Orange SPV M1000,Sprint IP-830W,Verizon Samsung i760,LG KS20,HTC TyTN II,AT&T Tilt,Sprint HTC Touch,Pharos Traveler 535,i-mate Ultimate 6150,i-mate Ultimate 8150,HTC Touch Dual,Asus P526,HP iPAQ 110,Audiovox PPC 4100,HTC Touch Cruise,Acer n30,Asus MyPal A620,Asus MyPal A716 ,Asus MyPal A730,Dopod 696 ,HP iPAQ h5500/5555,HP iPAQ h6315,HP iPAQ hx4705,HP iPAQ rz1710,HP iPAQ rz1715,i-mate Pocket PC,Mio 168 ,Mio 336 ,Mio 558 ,NEC MobilePro 250e,O2 Xda II ,Packard Bell PocketGear 3025,Qtek 2020,RoverPC P1,RoverPC P4,RoverPC P7,Symbol MC9000-G Series,T-Mobile MDA II,Toshiba e400/e405,Toshiba e800/e805,Alltel HTC Touch,HP iPAQ 210,O2 Xda Stellar,E-TEN Glofiish X800 and many others...

Supported Smartphones (Windows Mobile non-touchscreen devices):

Samsung BlackJack II,AT&T Samsung BlackJack II,Vodafone Samsung SGH-i620,AT&T / Cingular 3125 (5.0),T-Mobile SDA U.S. (5.0),Vodafone Samsung SGH-i640,O2 Xda Phone,i-mate SP5 (5.0),O2 Xda Cosmo,Toshiba Portege G500 ,Samsung ACE,Sprint Samsung ACE,Dopod 557w,Dopod 586w,Verizon PN-820,T-Mobile Dash,HTC MTeoR,HTC S620/621,HTC S310,HTC S710,Sprint Motorola Q,HTC S720,Samsung BlackJack,Vodafone v1240,Vodafone 1210,T-Mobile Shadow,Verizon SMT5800,Orange SPV E650,i-mate SPL (5.0),Orange SPV C600 (5.0),O2 Xda Graphite,AT&T / Cingular 2125 (5.0),i-mate SPJAS,HTC S730,Asus M530w,AT&T Pantech Duo,Pantech Duo,Dopod S300,Dopod C720W,i-mate SP5m (5.0),Pantech PN-820,Dopod 595,Qtek 8300 (5.0),O2 Xda IQ,Palm Treo 500,Qtek 8310 (5.0),Qtek 8500,Samsung SGH-i620,Samsung SGH-i640,Samsung SGH-i600,Mobile Assistant XPA v1405,T-Mobile MDA Mail,Vodafone Palm Treo 500v

Supported Symbian phones:

LG KT610,Samsung SGH-i560,Samsung SGH-i570,Nokia 6210 Navigator,Nokia N78,Nokia 5700 (S60 3rd Edition),Nokia 6290 (S60 3rd Edition),Nokia N76 (S60 3rd Edition),Nokia N79,Nokia N85,Nokia N93i (S60 3rd Edition),Nokia N96,Nokia E71,Samsung i8510 INNOV8,Nokia 6110 Navigator,Nokia E90 Communicator,Nokia 6120 (S60 3rd Edition),Nokia N75 (S60 3rd Edition),Nokia N77 (S60 3rd Edition),Nokia N80 IE (S60 3rd Edition),Nokia N91 8Gb (S60 3rd Ed.),Nokia 3250 (S60 3rd Edition),Nokia N95 (S60 3rd Edition),Samsung G810,Samsung SGH-i520,LG JoY,Nokia 6124,Nokia N80 (S60 3rd Edition),Nokia N71 (S60 3rd Edition),Samsung i7110,Nokia N73 (S60 3rd Edition),Nokia E66,Nokia N92 (S60 3rd Edition),Nokia E60 (S60 3rd Edition),Nokia E61(S60 3rd Edition),Nokia E70 (S60 3rd Edition),Nokia E50 (S60 3rd Edition),Nokia 5500d (S60 3rd Edition),Nokia 6220 Classic,Nokia N91 (S60 3rd Edition),Nokia 6650,Nokia E63,Nokia N81,Nokia E51,Nokia N93 (S60 3rd Edition),Nokia E62 (S60 3rd Edition),Samsung L870,Nokia E65,Nokia E61i,Nokia 5800 XpressMusic,Nokia 5320 XpressMusic,Nokia N97,Nokia N82,Nokia 6121,Nokia N95 8GB,Samsung SGH-i400,Samsung SGH-i450,Samsung SGH-i550

Easy WiFi Radar

Some things in life should be free. Easy WiFi Radar helps you find and connect to open wireless access points with a single mouseclick. It's WiFi for Dummies. And we're giving it away for your PC.

If you have ever tried to use Windows XP's built-in connection manager, you know what a hassle it can be to quickly check your mail or browse the web on the go. You need to browse through a list of access points, find one that you can connect to, manually try to connect to it, confirm the connection and then wait. Even if it says that's it connected, often it doesn't open a webpage or you mail will stall. Easy WiFi Radar automates all of this. It's main goal is to let you get your mail or surf the web without having to go through all of the connection trouble, and without having to pull your creditcard. Just run it and it'll connect you for FREE to the internet. It doesn't get easier than this.

Get your mail and browse the web without being charged. The ideal WiFi-tool for frequent travellers and mobile professionals. Easy WiFi Radar will connect to open hotspots automatically and shows you exactly what it is doing in a cool animated radar screen. Access points are represented as green, yellow or red dots. It plays a sound and opens your webbrowser as soons as it succesfully finds a free connection. Works on Windows

Creating a Wok Antenna and Wireless USB WiFi

TRY MAKING YOUR OWN TEST WIRELESS ANTENNA Wajan Bolic
WITH USB D-Link DWL-G120

A.) The first step is to prepare the material.
1 fruit frying pan * 36 cm in diameter
Paralon pipe 1 diameter rod 1 "long + / - 50 * cm
Close 2 fruit paralon paralon diameter pipe 1 "
1 buahKlem Antenna
1 buahBesi elbow to order clamp Antenna
Screws 2 buahBaut + 1 cm diameter
1 ex + buahKaleng Milk Plastic Cover
1 buahUSB Wireless D-Link DWL-G120 + USB Cable
1 CAT 5E Cable buahUTP maximum length of 20 M

B) Preparing equipment builders.

C.) Do calculations based on the theory as follows:
To search for Feeder Focus distance

f = D ^ 2 / (16 * d)

Make a USB Wifi Antenna

Ato USB wifi antenna called the Uni-Directional WIFI Range Extender is used to capture WiFi signals from long distances using standard WiFi USB adapter and a little creativity.

This idea does not require any modification to the ato wifi USB adapter to your computer. Just an easy shortcut to increase the signal strength and distance from your Wifi UBS anyway this works for all types of standard wifi USB adapter.

Equipment and Materials

All you need to make are some relatively inexpensive equipment except the USB adapter itself Ok. materials that need to be prepared are:


* 1 - Cover pan / Dandang (that of the metal from the plastic)
* 1 - USB WiFi Adapter
* 1 - USB Extension Cable (not long)
* ½ "Eyes drill (Drill Bit ato STEPPER bit)
* Glue Gorilla Glue (Epoxy works well too)
* 2 - Zip Ties (cable tie)

Cover pot drill

Cover the pan to let the drill hole, so let us prepare the drill ready. Punch a hole through the middle of your lid with the way in the drill hole. lobangnya remember to fit the usb hole which will be Insert.

Glue and Trim

Insert the Female end of the USB extention (the part that does not connect to the computer) into a hole that just in the drill hole ato. Continue glue / epoxy and set aside to harden sampe ga ato ato isa strong in rocking diputer ato-ato computers taken your brother (seriously!) Between the plastic and pot metal parts. Make sure the really strong with glued / epoxy both sides of the connector. Then it dries, use a cable tie part 2 ears saucepan until not shake when you use it (halah ...)

Done

Stay WIFI adapter plug into the USB socket on the fields and enter another part of the cable into your computer. Enjoy staying strong signal strength from a great distance. Turn ato Netstumber Kismet to see the strength gains you have. Minimum Silaken make war driving to your neighbors wifi.

Home made wifi antenna

USB Adapter 23dBm + 5dBi Antenna

solutions to build RT-RW-Net with a cheap and reliable.

a device that seems to make a single cluster-RT-RW-Net-based wireless LAN 802.11bg.

Actual instrument with existing standards in the market, but attractive is its ability to be a Access Point, so that we can build a HotSpot at home using a notebook or desktop computer.

In addition to the access point capable, USB solution with an external antenna is also the key to solving the problem we use notebooks. Often notebook wireless LAN signal range was only about 100 to 200 meters only accept signals only, without any ability to send signals, so that we finally crashed to the Internet for ria in the HotSpot area.

USB WiFi can be a way in the three Operating Systems, ie Linux, Windows and Mac, created by using chip-based Realtek Linux

802.11g Hi-Gain Wireless LAN USB Adapter

High Power WLAN USB Adapter which fully supports the features and functional compliance of IEEE 802.11b / g standard. It enables the deployment the latest updated WMMTM (Wi-Fi Multimedia) standard and our WLAN USB adapter is targeted at competitive price-performance, better power management, high volume desktop and notebook PCs.


Features:
High Power WLAN USB Adapter + 5 dBi dipole Antenna

■ 2.412GHz ~ 2.484GHz unlicensed ISM frequency band.
■ Operating distance of up to 500 meters in free space.
■ Support Software AP mode and WMMTM (Wi-Fi Multimedia) function
■ USB 2.0/1.1 interface.
■ .128-bit 64-bit or 256-bit WEP/WPA/WPA2
■ Support to Microsoft Windows 2000, XP, Vista, MAC, Linux.
■ Easy operation and setting up.


Standard: IEEE 802.11b, IEEE 802.11g

Frequency Band: 2.412GHz ~ 2.484GHz unlicensed ISM band

Data Rate: IEEE 802.11b: 1, 2, 5.5, 11Mbps

IEEE 802.11g: 6, 9, 12, 18, 24, 36, 48, 54Mbps

Transmitter Power: 22 ± 1 dBm

Receive Sensitivity: Operating at 11Mbps:＜-82dBm@8%PER, 54Mbps:＜ -70dBm@8%PER

Operating Range: Up to 500M, depending on surrounding environment

Power Consumption: Transmit:＜500mA Receive:＜270mA

Antenna Type: RP-SMA Jack

Security: WEP (64/128/256bit), WPA, WPA-PSK, WPA2 TKIP/AES, WPA2-PSK

I/O Interface: USB2.0/1.1

Operating System: Windows98SE, ME, 2000, XP, SP2, Vista, MAC, Linux

Operating Temperature: 0 ~ 55 Celsius

Storage Temperature: -20 ~ 70 Celsius

Humidity: 5 ~90% (non-condensing)

Size: 9cm(L)x2.9cm(W)x1cm(H)

Weight: 25g