Thanks Jim, I put an antenna behind the cockpit in the roof, the ferrite sleeve
seems to have fixed the problem, tommorrow I will fly to prove it.
Alan
Sent from my iPhone
> On 12 Jun 2021, at 15:29, h&jeuropa <butcher43@att.net> wrote:
>
>
> 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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> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=502344#502344
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