The problem isn't the GPS frequencies as they are receivers. However
they have local oscillators and are digital devices so can create
electromagnetic interference which can overwhelm the front end of a
GPS receiver rather easily.
GPS signals are very weak, below background noise. Easy to interfere
with or jam.
The other nav systems like Glonass, Galileo etc use similar strength signals.
EMI testing is usually done at 6 meters range which doesn't much help
us when everything is in the same cubic foot.
So the lesson is, try to keep GPS antennas separated although you may
not have a problem if they are close. Try is the only way to tell.
Mike
At 11:06 AM 25/03/2013, you wrote:
I've seen warnings regarding putting two GPS units close together than
300mm. Certainly, I have seen interference between a Flarm and GPS in
my glider.
Does this hold valid and does the situation change with different
frequencies used by alternate GPS systems?
D
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