I assume you are using the DL-1 as the load for all three tests, in
which case I would have to go with the DL-1 plus DMM. The impedance
error should be less than 5%, and the voltage measurement error less
than that.
Larry N8LP
John Pfeifer wrote:
Just finished building KX-1 #1207 with 30m board and ATU. Nice little rig!
After adjusting C9 on the KXAT-1 per the manual, I decided to compare the
power output measurements obtained via the internal power sensor, a DL-1
dummy load + DMM, and using my OHR WM-2 QRP wattmeter. BTW, the supply
voltage is 12.5v and I substituted a 33-ohm resistor for R30. Output before
I changed R30 was about 1-watt lower across the board. Here are the final
measurements, as built:
Band DL-1+DMM Internal WM-2
20m 2.6 3 3.7
30m 3.7 4 4.7
40m 3.4 4.1 4.3
Which wattmeter should I believe? I tend to think the DL-1 plus my Fluke
digital multimeter would give me the most accurate reading, but....
Also, no matter how I fiddle with the spacing on L3, 20m output is always
1-watt less than on 30 and 40m. I guess this is in line with what other
folks have reported.
tnx & 73,
John Pfeifer - WL7M
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