Firstly thanks to everyone for your input on potential causes of SWR
reading instability with my KX3. Since there were so many possibilities
(antenna, heating, radio, etc.) I knew I needed to go back to basics and
initially test the radio with a dummy load on the bench. Well, I
managed to recreate the issue and have documented my findings in a short
4 min video, http://youtu.be/cwxk4E01IfM
In short the problem appears to be associated with the KX3 reporting of
SWR in SSB mode. My radio is configured as follows: uC 01.79, dSP
01.27. As this issue has only recently developed (last month or so),
and while I can't be 100% sure, I think it may have occurred after I
upgraded to this firmware version.
I'll be contacting the folks at Elecraft to get their opinion on this.
73's Gary K6YOA
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