A recent upgrade to more powerful com radios has introduced a bit of an undesirable problem with the Trutrak autopilot.  When the auto pilot is engaged and the #2 radio is keyed, serious pitch oscillations occur.  While the Trutrak installation materials discuss its relative immunity to RF, it does suggest shielding the lines to the control wheel steering switch. if interference is encountered.  The radio upgrade included switching from RG58 to RG142, so the overall shielding is improved, however, the antenna for the #2 radio is much closer to the autopilot wiring and hardware than the #1 antenna.  The interference appears to be be coming directly off the comm antenna and not from any 'leaks' on the way there.

Are there any tried and true fixes for making the Trutrak immune to RF?  I really didn't want to re-invent the wheel on this one. 

 

Chris Zavatson

N91CZ

L360std