... handset power on-and-off caused the most significant changes in the spurious radiated spectrum". This seems to dovetail with my earlier speculation: "I have a feeling that the CPUs within the devices actually cause more interference" Only if by 'dovetail' you actually mean 'have nothing to do with'.......... http://en.wikipedia.org/wiki/Tin_foil_hat HTH

... that "Interestingly, repeatedly turning the handset power on-and-off caused the most significant changes in the spurious radiated spectrum". This seems to dovetail with my earlier speculation: "I have a feeling that the CPUs within the devices actually cause more interference" Only if by 'dovetail' you actually mean 'have nothing to do with'.......... -- Kwyj.

... range of all the mobiles/devices etc on the ground. Flying into Sydney from the north, the count would be in the tens of thousands. I guess most of the mobiles/devices are emitting - so do we get reports of erratic instrument behaviour? Radios not working? Surely from the welter of signals filling the atmosphere in those situations there would be some proof of interference? Paul

...happy to disregard reports of demonstrated interference in favour of hypothetical rejection capabilities...the relative probabilities of sources of interference. In contrast, GSM operates in a... startup. Surprisingly, this maximises the interference that it generates. X-rays ... yourself deeper Thus, "do *not* interfere with aircraft navigation systems" would ...

...>> (say) 3x = 2.4GHz. Now this might interfere with 802.11 but it is even *less* likely to interfere with VHF. No, the GSM *switching* frequency; TDMA... I mentioned was more likely. Now VHF harmonics might interfere with GSM, but the problem isn't the ... cajoled Eastern to test his 146 mhz radio for interference, and they OK'ed its use in writing... BUT...

...at (say) 3x = 2.4GHz. Now this might interfere with 802.11 but it is even *less* likely to interfere with VHF. No, the GSM *switching* frequency; TDMA,... gets into many audio systems. Now VHF harmonics might interfere with GSM, but the problem isn't the "safety ... cajoled Eastern to test his 146 mhz radio for interference, and they OK'ed its use in writing... BUT ...

... use UHF frequencies and do *not* interfere with aircraft navigation systems. The issue...happy to disregard reports of demonstrated interference in favour of hypothetical rejection capabilities...* case could the claimed/suspected interference be repeated under controlled lab conditions...within that band. Thus, "do *not* interfere with aircraft navigation systems" would seem...

...<bjfoster@yahoo.com> writes: I've actually seen mobile phones interfere with VOR, the needle swinging from side to side until they are ...GSM has harmonics at (say) 3x = 2.4GHz. Now this might interfere with 802.11 but it is even *less* likely to interfere with VHF. Now VHF harmonics might interfere with GSM, but the problem isn't the "safety of the cellphone" is it? ...

...>>>>>> Mobile phones use UHF frequencies and do *not* interfere with aircraft navigation systems. The issue is that whilst the interference is infinitesmally small it cannot be entirely dismissed -... ridiculous. I've actually seen mobile phones interfere with VOR, the needle swinging from side to side until...

... Mobile phones use UHF frequencies and do *not* interfere with aircraft navigation systems. The issue is that whilst the interference is infinitesmally small it cannot be entirely dismissed -... ridiculous. I've actually seen mobile phones interfere with VOR, the needle swinging from side to side until...