[Az-Geocaching] GPS receivers allowed on airlines: ++Continental

[AZPAUL]

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 at yahoo.com 
> <mailto:techwbb at 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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