My K3 has been having RF feedback problems with an 80 meter antenna. In
order to resolve things, I built an 80-meter dipole to use as a test
antenna. While all this was happening, over the past few months, I also
added a used KAT-3 tuner and a KXYN3A to replace the original synthesizer.
After building the dipole, I was puzzled that it would not tune up on
80. I do not know why it took me a week, but I finally checked out the
rig on my dummy load. It shows a high SWR on the dummy for all
wavelengths greater than the 40-meter band--60, 80, and 160. The rig
works just fine on 14 mHz. and up, and I can certainly tune it up on 40
meters. Further checking shows that there is no output on 60-160,
whether using the Tune mode at 5 watts or CW mode at 70 watts.
I have no idea when or why this happened, but I really need to know the
how it happened, so I can fix it. Can someone give me some guidance on
what to look at to figure this out? It is possible that resolving this
problem will also result in a resolution of the RF feedback problem,
although I won't count on that.
73,
Jan, KX2A
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