Good day
I was using my K3 on 80m sideband into a dipole with a good SWR reading
(1.5:1), in a contest. I inadvertently yanked the headset cable from
the rear connectors; my headset has a TRRS plug and was connected via a
commercial y-adapter to 2x TRS. I thought I had probably broken one of
the cables in the y-adapter internally, and as it was cold and I was
operating portable, I packed up without doing a lot of investigation.
I acquired a new y-adapter which I tested on another rig. When I went
back to the K3, I found very high (49 to 99:1) SWR readings on all bands
into a good dummy load. The ATU would attempt to make a match but the
best was 6:1. I was using 20W tuning power but the results were the
same using 5W. The same results were obtained using ANT1 and ANT2 (for
the avoidance of doubt, with the dummy load on the appropriate output
socket)
Having found an old thread in the archives
(https://elecraft.mailman.qth.narkive.com/IHFmlCeA/k3-output-stage-high-swr-fault-finding)
that reported some possible heat injury to T4 in the SWR bridge with
similar SWR readings on all bands, I have dismantled the radio and
inspected T3 and T4 which both look good. The surrounding area on both
sides of the RF board looks undamaged. The KAT3 ATU board also looks
undamaged.
I suspect the mechanical insult to the rear panel is probably unrelated
to the issue of the high SWR readings, but it is part of the history of
events.
I would be most grateful for any advice on further troubleshooting.
Peter
M0RYB
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