Damon,
I would speculate that you have bad diodes in the KAT2 wattmeter (D1 and
D2), or there is some other problem with the wattmeter in the KAT2.
Try this test:
1) Put an external wattmeter (or other power measuring device) on the
output of the K2 and make certain you are connected to a good 50 ohm
dummy load.
2) Set the power to 4 or 5 watts and set the KAT2 to CAL P and press
TUNE - check to be certain the K2 is controlling the power output near
the requested level.
3) Evaluate the result:
If the power goes to maximum output (but displays 0.1 or 0.2 watts -
which is actually zero), then you have a problem with the KAT2 wattmeter
circuit, and it it was working before, the most likely cause is that the
diodes have been zapped.
OTOH, if the K2 display shows some reasonable power output, but is quite
different from the external wattmeter, you need to calibrate the KAT2
wattmeter - start with the balance adjustment, then calibrate the power
output and finally calibrate the SWR. The adjustments must be done in
that order - if you go back to a prior adjustment, you have to re-do the
other adjustments.
Fact is you may have only the forward diode bad but not the refl diode -
that would cause a higher than normal SWR to be indicated. Since the
diodes were likely damaged by a lightning static surge (yes, it can
happen even with an attic antenna), I would recommend replacing both of
them if either are suspected of causing a problem.
73,
Don W3FPR
Damon - KC5CQW wrote:
Below is some of the text that I sent to Gary.
Basically, if I use the KAT2 to tune my 40m attic dipole the PA finals will
short out.
I haven't tryied to tune any other antennas because I don't want to pay for
any more PA kits ($18.50 'ish each time I tune up).
Also, CW is un-usable above 80m and no CW output on 10m (SSB and "tune"
yield 8.5W)
See text below...
73, Damon KC5CQW
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