I built K2 serial number 4443, and it has worked very well since I completed it last year. Recently, I have noticed a new odd behavior in audio sensitivity during the CW transmit/receive cycle. I have t-r set at 0.05. When I am sending CW the audio between keystrokes will sometimes drop off significantly for a few seconds and then recover to full sensitivity. This behavior repeats as I am transmitting, in a somewhat random manner. It is an intermittent, but consistently occurring problem that happens one or more times during each transmit/receive period. It happens whether I transmit into my antenna or a dummy load. I thought it might be the KDSP2 DSP Filter, but the behavior still occurs when I have DSP in bypass mode. It also occurs with all other add-in modules removed from the K2. Also, the K2 and all other station accessories have a common RF ground.
Suggestions on where to look for the cause of this problem would be appreciated. Thanks.Mike, KS7D_______________________________________________
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