Today I was trying to check power output on a newly constructed SW-40+
(my second one) and needed to recalibrate my WM-2 wattmeter. After
doing that, I decided to check it against my K2 (#337). Not even
close! The WM-2 shows 2.7 watts when the K2 shows 5. It shows about 7
w. when the K2 is set for 10 w. I double checked the calibration on the
WM-2 and put in a new 9v. battery and got the same results. The WM-2 is
supposed to read within 5% according to OHR.
I seem to remember lots of discussion about power calibration on the K2
long ago and that there's a 1% resistor in there somewhere that's
involved. I wouldn't worry about it if I was within 10% or so, but I'm
not even close. I don't have another independent way of checking this.
Should I believe the WM-2 or the K2 or neither???
73,
Randy, KS4L
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