I'm getting a high freq. noise when I press the PTT with the
headphones and mic plugged in. With the mic unplugged it 's ok.
With a handheld mic it's ok. Tried a different headphone, still
noisy. I grab the mic wire and the noise goes away. Continuity cks
ok in mic wire. What am I missing? Wires are shielded.

Ed
at wits end