For the sake of the Archives, here's the epilogue.
I replaced D1 and D2, with no change in behavior. Tracing showed that
there was close to 0V at the outputs of U5 during transmit. With power
off, the resistances at the inputs of U5 were about 10 ohms! The op amps
must have been zapped as well.
Don,
Thanks for the advice. That's a strong possibility, since I just
performed the same successful repair on my KPA100, which may have been
inline at the same time.
On this topic: A friend suggested putting a 1 megohm resistor across the
antenna terminals to help dissipate static charges when u
Jonathan,
If it was working before, it may be that the wattmeter bridge diodes in
the KAT100 were zapped with a lightning surge.
I suggest the first step is to obtain 2 1N5711 diodes and replace D1 and
D2. While you are doing that, check the soldering/tinning on the leads
of T1. If that do
After working OK for several years, my KAT100 no longer indicates SWR, nor
does it tune properly.
When used with my K2/100, in ATU Auto mode, with the TUNE button, the
KAT100 starts finding a match as expected. However, none of the SWR LEDs
illuminate, and the K2 display indicates 1.0-1 SWR durin
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