Well, it's reassuring to know that the problem is all most certainly
associated with data sampling and not a failure of the KX3 - I thought
for a while there the unit was going back to Elecraft.
For those that asked questions relating to other modes, this problem
does not appear to manifest with FM, AM or when using the TUNE function.
That being said, as someone that uses my KX3 almost exclusively for
portable SOTA SSB activation, accurate reporting of real-time SWR
measurements when operating in SSB mode is important. Often I'm tucked
behind rocks or under trees trying to stay protected from the elements
on a high peak and my antenna might not be in easy sight. Thus, a high
SWR reading is usually the first indication that there's a problem with
my portable antenna. Typically wind buffeting related, problems are my
20ft fishing pole colaspes or one of the linked dipole connectors
touch. So for me a reliable SWR real-time reading is important.
Also, I'd had over 500 QSO before seeing this problem. Thus, I believe
either a recent firmware or configuration change has caused the issue.
Finally, a fix should be fairly simple. If the problem is as described
- a stale data issue where SWR is calculated by Reverse Power at time T
divided by Forward Power at time T + some delay (which explains why the
spiking occurs as the power falls following the end of a syllable), a
fix can be effected in several ways i) reverse the order of the power
measurements, that is ensure forward power used in the calculation is
always measured before the reverse power or ii) do not undertake the
calculation if the forward power has dropped below a certain threshold,
say 2W.
As a portable operator, I for one would certainly like to see a fix.
73's Gary K6YOA
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