You don't mention the quality of the dummy load on the end of the K1 and/or
WM-2. It really matters.
Dan / WG4S / K2 #2456
snip
But at the low and high end, the meter reads high.
/snip
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You
Vin,
What you are observing at the low end is differences in the diode
characteristics. The WM-2 has a diode compensation circuit which attempt to
correct the readings at low power levels while the KAT1 does not - so the
WM-2 is likely more correct at the low end
The difference at the high end
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