Radio works, i've heard people on 20 meters with a tuned dipole, the only thing is when i turn up the volume to hear better the S meter maxes out and I lose audio to a pulsating buzzing/humming noise that sounds like speaker overload. What is going on? My first thought was a grounding problem maybe with an op amp, but I don't know this radio well at all. I was hoping someone might know what is going on and how to fix it.

Radio Communications