jls wrote:
Also instrument needles go crazy.

Aircraft is a Lancair with antenna hidden in the horizontal stab. How
'bout directing us to some reading material about how to stop it.

Our local avionics guy says we may have to live with it, or install
external antennas, which will dirty up a Lancair in a hurry.

Jim Weir?

Thanks and happy holidays.

Check your com antenna connections. Sounds like a bad cable
shield ground allowing RF to escape and disturb sensitive circuitry.

Dan