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On Monday 25 September 2006 15:59, Doug McGarrett wrote:
It should be pointed out that WiFi uses much lower power levels than cellular phones are capable of, and that the frequencies used in either case, are not used for aircraft navigation or communication.
Not entirely true: The MLS (Microwave Landing System) is 5.0 to 5.25GHz. TDWR (Terminal Doppler Weather Radar) is 5.6 to 5.65GHz. Only the major airports have them. In the US, the 802.11a operating frequencies are: 5.15 to 5.35GHz and 5.725 to 5.825GHz. (no conflict) It's the European region 802.11a clients that worry the FAA. They overlap the MLS and TDWR system: Europe: 19ch 5.15 to 5.35GHz and 5.47 to 5.725GHz (conflict BOTH) Japan: 4ch 5.15 to 5.25GHz (conflict MLS) China : 5ch 5.725 to 5.85GHz (no conflict) US: 12ch 5.15 to 5.35GHz and 5.725 to 5.825GHz. (conflict mls) -- _____________________________________ John Andersen