Jeff,
Here is another possibility.   I have heard that other com radios can also
cause this problem.


I started out with the GPS antenna for my Garmin 195 velcroed to the top of
the radio stack, just under the glare shield.  It took me a while to figure
out why I sometimes lost GPS signal.

Turned out that when my com radio (KY-97) is tuned to certain frequencies
the receiver local oscillator radiates a signal which blocks the GPS.  I
discovered that the GPS failed whenever I was listening to Travis approach
(119.9), and when I have my KY97A tuned to this frequency (just listening,
not transmitting), the signal strength bars on the GPS drop down near zero.
Flip to a different freq. and the bars jump back up.  I have read that there
are a few other receiver frequencies that also cause this problem.

I moved the GPS antenna to the back of the airplane as far as the antenna
cable would reach and the problem went away.

Bob Belshe
Lancair 235/320  
http://home.comcast.net/~rbelshe/



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