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Old 11-17-2007, 06:02 PM   #11
TomW
Beastly Adventurer
 
Joined: Jan 2006
Location: Ft. Payne, AL
Oddometer: 1,013
Well, I'm certain that consumer-grade GPS receivers aren't designed to be immune to overload from an enormous signal so close in frequency, particularly since running across a signal like that is normally extremely rare (CB/ham/2-way radio and cell phone transmitters are far-removed from the GPS band). The greater sensitivity of the new GPS receiver chipsets could make the Spot/GPS problem worse.

Since Spot's GPS receiver is likely interfaced with the unit's controller, the GPS receiver is probably just turned off for the second it takes to transmit data to the GlobalStar satellite, thus avoiding freakish behavior resulting from overload. That's a much, much easier (thus cheaper) solution than providing a bulletproof 1.6gHz GPS receiver inside the same box with a 1.6gHz transmitter.

Cheers.
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TomW
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