Hi,
I am having false ELT alarms from my new ACK 406 ELT going off when I turn on my Narco Transponder with added UAvionix ADS-B in-out. I built my Kitfox 4 in 1993 and the ELT mount is behind the passenger seat (never had a problem with my old ELT). ELT antenna is behind Pilot on 16" ground plane inside fuselage. Transponder antenna is very close to ELT unit about 12".

The techs at ACK say I need to move transponder antenna at least 3' away from the ELT unit because the new satellite technology is much more sensative to RFI. They also suggested wrapping the ELT unit in tinfoil to protect it from RFI. This worked but not all the time.

Since ADS-B out is pretty new any thoughts? I will post the results of my moving the transponder antenna soon.

Cheers,
Kirby