Garmin GpsMap 396 - Flight Test #2

In article . net,
Mike Spera wrote:
O.K., if there is an EMI issue, why does it only affect the Garmin? The
Lowrance and Apollo units were completely unphased by the transmissions
and never lost their lock during the entire test flight (and the
previous 8 years of use). I tested them all side by side. The Garmin sat
bars were hopping all around in straight and level flight while the
older units were stone solid.

Something specific to newer GPS receivers?


I don't know about that, but I do know that Garmin uses an active
antenna, whereas many others (including Lowrance) use a passive antenna.
Not sure how much difference this makes for RFI, but I suppose that any
interference could be amplified from the antenna.

I can tell you that I haven't had any GPS reception problems with my
396, and I have a fairly old panel (King KX170Bs, etc.)

It's unclear whether you've called Garmin Tech Support; if you haven't,
I would highly recommend it. If you aren't going anywhere with them,
call back or escalate until you are talking to someone who can help
narrow the cause(s) of your problem.



JKG