nuckolls.bob(at)aeroelect
Guest
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 Posted: Fri Nov 30, 2012 5:44 am Post subject: Using a Handheld radio to "Sniff" for RF leaks behind th |
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At 04:49 PM 11/29/2012, you wrote:
<bbradburry(at)bellsouth.net>
I have a situation where the transponder, sometimes KMD150 moving map, and
sometimes TruTrak DigiflightII autopilot shut off when the Garmin DNS 430W
mike is keyed. I am assuming that I have a massive RF leak from the Garmin
coax that is causing this shutdown.
Reasonable hypothesis. What kind of airplane and where
is your comm antenna located?
Have you checked SWR on the comm antenna?
I could be wrong because I have had
occasion where the transponder shut off for no apparent reason. I just
wanted to check for a leak.
I also plan to fab a coax that goes from the radio straight to the antenna
bypassing everything that it may be in proximity to in order to see if that
helps.
Interesting experiment. Coax cables with LOW SWR don't
'leak' If a substitute coax DOES help, it's more likely
that you've got a poorly fabricated coax.
The more I think about this problem the more my head hurts!
It CAN be interesting . . . been there, done that . . .
Bob . . .
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