[Elecraft] wattmeter calibration

[AD6XY - Mike]

I have now fixed my problem. RFC1 was not soldered in properly. At first,
after much debugging of the schematic I thought it open circuit. It was only
when I came to remove it that it became clear what had happened. One end was
not soldered at all. A common problem with these large SMT inductors.

Here are my power readings for 5W calibrated at 14.15MHz made with an HP435B
and a 8484A head. Please note this head is only specified down to 10MHz -
though it does work below there.

80m 4.7W
60m 5.0W
40m 5.5W
30m 5.9W
20m 5.0W
17m 5.0W
15m 5.5W
12m 5.5W
10m 5.4W
6m  5.5W

All to closest 0.1W. The maximum error appears to be on 30m at nearly 20%.
This is pretty good, but you can not rely on the set power to be exact.

For the 1mW setting from the KXV3, I only checked in a few places as I
really only care what it is on 10m. I was able to set it to 1mW. At that
setting the 1.5mW meter gave 1.5mW out. Pretty good. The accuracy degraded
below 1mW, so 0.5mW power indicated was actually 0.6mW with things getting
worse at lower levels. The minimum power output was around 0.2mW.

I would like to look at the IMDs at the 1mW output, but I don't have the
equipment for that at home.

Mike

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