Posted for Peter.Sokolowski@t-online.de:

 Dan,
 there is no such grounding possibility at the TruTrak - at least there is no
on the schematic and they have not suggested it to me as I asked TT for
possible solutions.
 in the meantime I have discovered that moving the calbes a bit changes the
interference.... so the next I try is to put some ferrit on the servo cables
to hopefully erase the source of the failure - beside doubled shielded HF
cable (the Becker radios provide between 20 and 25 W output - at least I
should not have transmiting problems later... :-) )
 Thanks for the hint and I will report on final solution.
 Peter LNC 360 MKII 85%