There may be another possibility for such a ban , that is not related to
any RF signal interference. It might be some left over residue of the
911 paranoia.
----- Of all the things I have lost -----
-------- I miss my mind the most --------
Team Nine Lives wrote:
> As AZcachemeister said, receivers also typically transmit, usually on
> some harmonic frequency of the transmit frequency. AM and FM radios
> are dangerously close in the spectrum to airline frequencies (close to
> FM, but the signal has AM characteristics in the carrier method, as I
> understand it--doubtless ShadowAce or somebody will fine tune this if
> it isn't accurate).
>
> There are reports that some spies have been detected based on
> detection of the transmitter elements of their receivers.
>
> So the "logic" probably goes like this: Since radio receivers also
> transmit, they might interfere with aircraft electronics or
> communications. A GPS receiver is a radio receiver, so it too must be
> capable of interfering. Ergo, we can't allow it. (Never mind the
> details of the frequency and modulation....) Perhaps now somebody is
> doing some actual RF emissions testing and deciding GPSr's are
> acceptable.
>
> On Fri, Mar 21, 2008 at 5:00 PM, Bill Brightman <techwbb@yahoo.com
> <mailto:techwbb@yahoo.com>> wrote:
>
> Does anyone have an idea of the logic behind banning use of GPS
> units in flight?
> I can see why devices which emit a signal, like a cell phone,
> could be suspected of possibly interfering with the plane's
> electronics. But it seems like a GPS would be more along the lines
> of an MP3 player or something. Just wondering if I'm missing the
> point here...
>
> Bill B.
>
>
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