Hookay, I figured out what I am responding to. It turns out the 'buzzy' beep only happens when the K3 is in SSB mode (not a mode I use all that often) and Noise Reduction is on. It almost sounds like an overloaded audio circuit, or maybe like the trailing hash that you see/hear in the movies when the police officer un-keys his mic..."that's roger, over.. kesssssh!" Unpleasant to hear, but not more than an annoyance. I still would like to silence the beep when I switch the Oper/Stby button on the KPA500. Is there a way? .. mike AI6II
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