[Elecraft] KPA500

[Pete Smith N4ZR]

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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