Looks like your tip worked....added ferrite toroids and moved the antenna
cable about 6 inches further away.
wrote in message
Russell: Some Diamond DA-40s have a similar problem. It seems to be
related to routing of the radio coax near the ELT control wiring. They
came out with a Service Bulletin which is bsically putting a split
ferrite on the control cable near the E-01. Here is the link: