I have a Garmin GPS III Pilot portable and have never had a problem. I have
used it in 172s, 182s, and various Piper aircraft both sitting on the
glareshield with its little stubby antenna, as well as sitting on the right
seat using a portable "full-size" antenna with the suction cup unit on the
bottom right corner of the windscreen.

Marc


"Jonathan Goodish" wrote in message
...
In article .com,
"Jay Honeck" wrote:
http://www.scn.org/~bk269/gps.html

This is an interesting site that explains why some pilots (seemingly
mostly running Garmin-brand portable GPS units) are having trouble with
losing satellite lock.

So far I've not had any trouble with our new 496 (and I've never had
any trouble with the Lowrance or AvMap units) -- but it's nice to find
an actual explanation for a problem that has struck several folks on
this group.


I'm not an EE so I can't comment on this guy's conclusions, other than
to say that the Garmin installation manuals for panel-mount GPS units
specifically warn against running the GPS antenna cable near nav/com
radios. My avionics shop told me that modern radios are sufficiently
shielded, but obviously, some older radios are not. Garmin uses the
same active antenna system for panel-mount as they do for portable.

I can also say that I have KX170B nav/coms and have never had a problem
with interference on the 396.



JKG