Larry,

Try doing the TX Gain Calibration. It is quite easy to do from K3 Utility. If it fails in K3 Utility, then try doing it on a band by band basis as indicated in the Calibration section of the manual.

73,
Don W3FPR

On 1/30/2016 10:27 AM, Larry Snyder wrote:
PSK31 and JT-65 stopped working on 40 meters. . Initially I see the PO at 45
watts but then it immediately backs off to a fraction of a watt with no or
very little modulation on the P3 with the transmit monitor.

I change to 20 meters and everything works just fine.  Same computer, same
everything - only thing changing it the band switch on the K3??


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