I don't know if this will help, but I've had two experiences with my K3 regarding power reduction. While attempting to participate in the 160M contest, I connected to my 80M dipole and hit tune in the ATU active mode. I immediately got a high SWR and retune cycle which reduced the SWR at the rig to ~ 10:1. Checking the power output, which had been set at 106W, it was indicating 79W. During a second subsequent tune (same ant and same settings ) the rig initiated a tune cycle and immediately shut down. No overpower/high current indication. I turned the rig on again, and everything was the same as before. I suspect maybe the tune was marginal and that at that SWR the rig is between a 'continue or shutdown' logic process. No residual effects were noted. Al WA6VNN K3 #31
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