Randy,
If you want to get the WM-2 reading closer than 20%, I suggest the
following if you do not have a dummy load that you can trust along with
a device to read the RF voltage across that load.
1) Disconnect the KAT2 and drive the best dummy load you can locate with
the base K2 - run the power through the WM-2 and adjust the WM-2 to
agree with your K2.
2) Put the KAT2 back in your K2 and drive the same setup of WM-2 and
dummy load. Adjust the forward power pot on the KAT2 to read the same
as the WM-2.
You should end up with a WM-2 and a KAT2 that agree within 5% to 10%
over the entire scale. And both should be within 5% to 10% of the
actual power that would be measured by using better instrumentation.
One can use simple tools and still obtain a satisfactory degree of
accuracy if you do the steps in an order that provides reliability. It
is also good to have an idea how much your instruments vary from
absolute accuracy.
73,
Don W3FPR
Randy Moore wrote:
Don,
Thanks for your thorough response! In thinking that through and then
going back to read about calibration of the KAT2 I realized what I had
done wrong :-( I had not commanded the KAT2 to re-tune into the dummy
load! It was still set for whatever it needed to match my antenna
system!! After that dawned on me and I re-tuned the KAT2, the WM-1
and the K2 agreed as exactly as I can read the meter at 5 w. For some
reason, the WM-2 (even though re-calibrated and double checked) is
still off about 20%. But those are close enough readings for my
purposes!!
Back to setting up the SW-40+! This is my therapy while I anxiously
await delivery of my K3, probably near the end of November!!
Tnx es 73,
Randy, KS4L
K2 #337
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