The power control of my K2/100--KAT100 combination is acting
up. This happened after a nearby lightning discharge (rare
in the Seattle area). Power output does not track the power
control setting very well. For example, with the lowest
"high power" setting of 11 Watts, I am getting about 20+
Watts out. Also power control is not stable and "hunts"
between levels about 5 Watts apart. I see this at all power
settings, including low power settings.
I went through the alignment and test steps in the KAT100
manual starting on page 27. In the Power
Calibration-Reflected step I measure zero voltage at pin 5
of U5, not 1.8 Volts as expected (using 10 Watts RF power
for this test).
In the Power Calibration-Forward step the 1.8 volts is
present at pin 3 of U5.
I suspect D2 was blown by the EMP from the lightning. Any
suggestions as to how to confirm this? What else should I
look for?
Other than the power control, the tuner still works and
auto-tunes, although I haven't confirmed its really
matching. The rest of the equipment seems all to be okay.
Thanks, Don, W7VXS
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