In case anyone is still having this issue and was following my problem a week or so ago here is what I did to resolve it.>I ran the power gain calibration in the Utility program several times. It was better but not corrected.>I borrowed another K3. Results were mixed. That K3 would do it also but not on the same bands.>Hooked up another power supply. Problem virtually solved except on 12 meters. Not sure why that would have anything to do with it.>Bought a new Astron SS50M. I have not been able to duplicate the issue. Display on K3 reads 13.9 volts at idle, 13.3 at 110 watts and 13.5 at 26 watts.>I have tried CW, RTTY, FT8, and SSB.
I'm not sure if that is always the solution to the problem but in hind sight I should have suspected the power supply. It is an early 80s Astron RS50M with many thousands of hours. It was actually ran continuous for 6 or 7 years as part of an RC battery charging set up in a not so hospitable environment.I got my money's worth.
73,
Gary KC9EE
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