Dave, you're probably better off asking Elecraft directly (if you
haven't done so already). They have been quite helpful, though I will
NEVER understand their failing to publish schematics since the K3 era.
73, Pete N4ZR
On 11/5/2024 8:57 AM, David Olean wrote:
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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