Thanks to all who responded.  Alas, the problem continues.

Let me respond to the queries to date:

1. The rig is a recent K3S (100W).
2. The KPAT is on, "PA nor".
3. The circuit breaker seems fine.  No red showing on button, button feels
loose.
4. Operation is into a dummy load, without wattmeter.

I've tried using the TUNE button, setting the TUN PWR level to 20W. On
pushing TUNE, the panel says 0 W, even though it was set to 20W.

In CW mode, the ALC shows reasonable ALC movement on CW sending.  RF output
remains at 1 segment.

Note: No error message has been received of any kind.  All operation, other
than RF output, is fine.

The last contact I had before leaving on the trip was on SSB just to set up
the mike. All worked fine on 20 m.  Perhaps I "hit" something in playing
with SSB.





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