I have a KPA 500 that is hardly ever used. I think I made less than ten
contacts with it. As a result, I am not that familiar with it except
that it worked great. I loaned it out to a friend and it came back
broken. I am trying to figure out what happened. When I key the radio I
see about 0.6 amps of idle current. TX Signals will pass thru OK on
standby, but if I try transmitting into the amp, I see a high input
VSWR and the idle current stays constant at 0.6 amps. There is no
output power. It seems that maybe the input TR switch may be at fault.
Question: What is the proper idle current for the FETS as displayed on
the screen? If I had a schematic, I could dig into it, but not having
that, I figured that I would ask a few questions to get me pointed in
the right direction. Can anyone help out?
Dave K1WHS
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