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Take a close look at the supply voltage as seen at the K3 during transmit. Significant sag will drive the power control algorithm nuts. I had a similar problem, although not as severe. Replacing the power lead with shorter, fatter wire and upping the supply voltage to 14.2 v did the trick. HTH
On Aug 6, 2020, at 20:16, Chuck Miller <cwmiller20@...
Still fighting a problem with my K3. When below 12 watts, every thing is fine. above 12 watts (where the KPA3 kicks in) most of the time it 0 watts, but about the same current you would expect for 100 watts. then after repeated tries, the power will come up and be stable. then the next time I press tune it is back to 0 watts. I notice if I press tune, or press the key in cw, the power is 0 for several seconds (long enough for me to send my callsign 3 or 4 times) and then the power comes back again. It will not pass TX gain calibration because the power does not rise immediately but takes several seconds. Any ideas?