Ben,

That would explain it. A pitch of zero would put the audio in the sub audible 
range and probably put it below the bandpass of the audio amplifiers and 
filters resulting in muffled or no audio in CW. If you set your IF bandwidth 
high enough, you would have been able to hear stations that were quite far away 
in frequency but not the ones you were tuned to. I'm curious as to how the 
pitch got to zero, I thought the K3 had a lower limit around 400 Hz for the CW 
pitch. Anyway glad you found the problem. 

73,
Chuck - AA3CS

Sent from my iPhone

On Jun 4, 2011, at 7:02 AM, SM6CKU <[email protected]> wrote:

> I found the problem. For some reason the pitch of the sidetone was zero and 
> was adjusted and sidetone OK. But how can that "mute" the receiver in CW mode?
> Now everything is normal but these small things makes me nervous.....
> 
> 73 de Ben
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