I need some help wrt interference I discovered between my Coms and my autopilot. The interference is frequency depending, with the worst in the high and lowest. With the autopilot engaged triggering the Com elevator goes up and ailerons initiating a right turn. I have used high quality HF cables and the distance between the Com and the TruTrak is about 3-5 inch. The HF cables are going in parallel to the (unshielded) ones from the computer to the Servos (2-axis).

Any recomendation hints ?

Peter,

 

You have just entered the dark side.  Black Art is now required assuming there is no fault in shielding.  I have had some success in reducing or eliminating com interference with the VM computer temperature processing circuitry by moving com antenna cables to different orientations or bundling them differently. If you can get the failure on the ground, try this and see if there is a change.