[Elecraft] K3 Watt Meter Calibration Question

[engineercm]

Noticed today 20m output measured by LP100A was 90w when K3 wattmeter set to
100w. Same with 10m; other bands measured close enough.  Updated firmware to
latest and performed Transmit Calibration.  Calib:WM HP at 50w set to agree
with LP100A.  In order to get 100w on LP100A, I have to crank the K3 output
so that it reads 110 on the internal wattmeter.  Why?  Slope effect of
internal WM?

ATU is in Bypass; tried two different dummy loads with same result.  Yes, I
know 10% difference is barely noticeable at the other end; it's annoying.

What am I doing wrong?

Clark
WU4B



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