[Elecraft] Which meter to trust?

[N8LP]

Normally, I would think maybe a transient power issue, due to ALC overshoot
or poor 110/220 volt mains regulation. I don't think the latter would be the
case with a KPA500.

The LP-700 is very fast, and will respond to very short transients of power.
You can slow the meter response down using the Peak Resp(onse) setting in
SETUP if you like. I assume that you have the K3 power set to just enough to
drive the amp to 500 watts. I like to use a small amount of CMP (6-10 dB) to
set a stable upper limit, and then set drive to just at the threshold of
ALC.

Larry N8LP 



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