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Crister,
did you try turning off one radio at a
time?
did you try tuning radios to different
frequencies?
if that doesn't work, try removing one antenna and
then try swapping radios to that antenna?
did you try transmitting on ground when engine is
at high power?
anecdotes:
in my LIVP I have one com antenna in the vstab and
one on the belly. The one on the belly is marginal when on the ground and
changes depending on orientation of the plane. It depends also on where
the receiving antenna is.
in my cessna for some reason both radios currently
transmit at the same time. if both are on the same frequency it's
unreadable.
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