Alan,
The trim motor is located very close to the comm antenna if your antenna is
located
in the rudder flange per the manual. If the comm antenna is not well tuned,
there may be excessive radiation from it that interferes with the trim motor.
I'd suggest you check the standing wave ratio (SWR) of the comm antenna at
different frequencies.
You might try wrapping the trim motor in conductive foil (aluminum foil) to see
if shielding it solves the problem.
Ferrite sleeves often do not solve the problem as they are not universal and the
ones that are readily available are not correct for our VHF frequencies. I
tried a lot of ferrite sleeves when I had my Blue Mountain EFIS trying to solve
problems with very little success.
Jim
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