"Marc Ramsey" wrote in message
m...
wrote:
Does anyone have experience with mounting two "mouse" GPS antennas in
close proximity of each other? Any interference issues? Specifically,
I'm thinking along the lines of two Garmin 35s, or a Garmin 35 and a
remote antenna for a Colibri, both within a few inches of each other
under an instrument panel cover.

Obviously if they are passive there shouldn't be a problem, but I see
the term "active antenna" used and I'm wondering...

Indeed, placing two GPS receivers in close proximity to each other can
cause problems, due to radio frequency interference emitted by the GPS
receivers themselves. I've seen this most acutely with receivers from two
different manufacturers, place them within a few inches of each other, and
one or both will lose satellite lock in short order. I'd keep the
receivers separated by a least a foot or so (the GPS 35 receiver is, of
course, inside the "antenna"). Placing the two antennas in close
proximity should be less of a problem, though I suppose RFI from one
receiver could in some cases leak into the other by way of the antennas...

Marc

I had a problem in my glider with a Garmin 12XL and my LX4000. The antenna
from the LX was mounted on a metal panel cover which when the canopy was
closed caused the loss of both signals to the GPSs. Had to fit a plastic
cover to cure this. The 12 XL is about 12 ins from the antenna of the
LX4000.

Peter.