pete.howell(at)gecko-grou Guest
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Posted: Fri Nov 03, 2006 10:35 pm Post subject: Garmin 396 Ground Loop |
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hello,
I just added a Garmin 396 to my RV-9A. I have the audio output connected to
my stereo intercom aux inputs along with a traffic monitor and engine
monitor (with isolation resisitors). When I have the 396 powered through
the airplane, I get audio noise. If I run it on battery, the noise goes
away. I'm thinking ground loop. The 396 power ground goes to the main
ground block on the firewall. The audio grounds go to an avionics ground
bus at the back of the intercom that is ultimately wired to the main ground
block.
Any thoughts? I won't mess with this too long before I will try an inline
ground loop isolator like this one:
http://www.discountcarstereo.com/detail.aspx?ID=970
Thanks,
Pete
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