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2.4GHz Just a little info

In the United States and Canada there are 11 channels available for use 
in the 802.11b 2.4GHz WiFi Frequency range. This standard is defined by 
the IEEE.

Channel 	Lower Frequency 	Center Frequency 	Upper Frequency



	2.412 	2.423
2 	2.404 	2.417 	2.428
3 	2.411 	2.422 	2.433
4 	2.416 	2.427 	2.438
5 	2.421 	2.432 	2.443
6 	2.426 	2.437 	2.448
7 	2.431 	2.442 	2.453
8 	2.436 	2.447 	2.458
9 	2.441 	2.452 	2.463
10 	2.451 	2.457 	2.468
11 	2.451 	2.462 	2.473

There are only  3 non-overlapping channels available in the 802.11b 
standard.These are Channels 1,6, and 11. For WiFi access points that are 
located near each other it is recommended that they each use one of the 
above non-overlapping channels to minimize the effects of interference.


Wi-Fi <http://en.wikipedia.org/wiki/Wi-Fi> consists of unlicensed 
channels 1-13 from 2412MHz to 2484MHz in 5MHz steps.

Spectrum assignments and operational limitations are not consistent 
worldwide; most of Europe allows for an additional 2 channels beyond 
those permitted in the US; Japan has one more on top of that - and some 
countries, like Spain, prohibit use of the lower-numbered channels. 
Furthermore some countries, such as Italy, used to require a 'general 
authorization' for any WiFi used outside an operator's own premises, or 
require something akin to an operator registration. For Europe; consult 
http://www.ero.dk for an annual report on the additional restrictions 
each European country imposes.



  Robert Davies
AMSAT Area Coordinator
AMSAT Member#35649
AMSAT President's Club 
Bronze Sustaining Donor
Sent via amsat-bb@amsat.org. Opinions expressed are those of the author.
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