Radio feedback problem
Hello everyone,
I'm hoping someone can help me out with an issue we're having with one of our Astar helicopters... We have 2 comm radios in this machine among other things, and when transmitting on Comm 2 you get this horrible squealing feedback, sounds like when you hold a microphone by a speaker... Here's what we've tried so far:
-Switched out radios
-Switched out Audio controller
-Switched antennas
-Replaced the entire coax cable from radio to antenna
-Tried different headsets
-Put grounds from different locations on the antenna
We hooked up a dummy load instead of an antenna as well and when we do this we don't get the feedback. I've run out of ideas and was hoping someone here might be able to help is out! Oh and I forgot to add that Comm 1 works flawlessly.