[Elecraft] K3 - Erratic receive

[Brian Hunt]

According to the schematics, those two double pots on the front panel are merely voltage dividers. They provide 0 to 5v signals to the front panel MCU which controls the function, eg: AF_GAIN. It’s possible the pot has developed a dropout right at the point where you usually set the AF level. Maybe turning the pot stop to stop a half dozen times will improve it??  Worth a try. 

73,
Brian, K0DTJ

> On Nov 29, 2023, at 12:12, Pete Smith N4ZR <pete.n4zr at gmail.com> wrote:
> 
> My 2400-serial number K3 has begun to have a sporadic receive problem, which has gotten much worse recently.  It's really weird.
> 
> What happens is this - the receiver sporadically loses most of its audio output level, until I move the AF pot a couple of degrees either way, at which point it immediately restores the audio.  Often, but not always, this occurs right after a transmission (on CW), so I was initially suspecting a failing relay, but the way it responds to a minute change in the AF level setting makes me think something subtler.  Any ideas?
> 
> --
> 73, Pete N4ZR
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