This filter solved my problems. Here is a copy of original posting.
I am happy to report that the RF problem I was having with the Trutrak autopilot has been solved. One of the posted suggestions pointed to a filter adapter that is installed between the controller and the harness. I ordered part number FCE17-B25AD-250 from Digikey for about $25 and it cured my system. Not a hint of interference from either radio.
thanks to all who wrote in.
From: Wally Bestgen <whiskeyb@sbcglobal.net>
To: lml@lancaironline.net
Sent: Tuesday, April 7, 2009 7:31:46 PM
Subject: [LML] TruTrack RF
In a recent post a part number was provided for a 25 pin RF filter used in conjunction with the TruTrack AP. The computer that I saved that part number on has “packed up” is on the was to the repair shop. Inow find myself in need of that part number. If any one could be so kind as to post the number again it would be greatly appreciated.
Wally Bestgen