I'm a relatively new owner of a KPA500. I'm also, thanks to the new K3
firmware, using QSK for the first time in my ham career.
These two facts have led to me hearing a slight clicking noise emanating from
the amp that follows the keying. This is unrelated to drive or output power,
since it happens in the TX Test mode too. I understand that PIN diodes are used
for RF switching but it still sounds like a reed relay to me.
Any explanation? (Hint) Having a schematic would probably make this self
explanatory.
Wes N7WS
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