It isn't the actual frequency that GSM transmits on that causes the issues. It is because the timing of the data bursts is at an audible frequency that actually causes the ditditditdit noises you hear on speakers/radios.
Huh? 850MHz is wwaayy above any creature's hearing ability. What did you really mean there?
Exactly what he said, I expect. You don't hear the carrier frequency. But if it transmits a packet (or a byte, or whatever) at a regular rate of (say) 100 times a second, there's a 100Hz frequency component present, and that's the component which the speakers reproduce and which is audible.
Peter
Mmm.. that's pretty unlikely in reality, especially given the 200 times/sec channel hopping that (most) GSM systems utilize, on top of the PSK modulation and code spreading.
More likely is some internal thing in the specific handsets that happens to resonate
just right, like how I can "hear" the Core2Duo in my notebook under certain loads.
Cheers
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