Zachary T squeal

[Crasher]

Zach T, same board as Cobra 29/89xlr, some others. No matter what mic, radio has high pitched squeal, rf feedback, in tx. Audio sounds tinny. I've added grounds, caps from audio/ground, turned audio pot down (helped some), aligned the radio. Sounds like a bad leaky cap, but maybe something else? Any ideas?
Thanks

 

[M0GVZ]

What happens when you connect the radio to a dummy load?

 

[Crasher]

Same thing, almost like RF getting in the tx audio. Happens with stock and 4 different powered mics. Very tinny audio as well.

 

[sonoma]

has someone put talkback in the radio.if so disconnect it and see if it still does it.

 

[Crasher]

No talkback, radio is stock. Limiter is still intact.