Re: KPA500 hi swr error

Posted by Phil Salas on Mar 17, 2012; 11:18am
URL: http://elecraft.85.s1.nabble.com/KPA500-hi-swr-error-tp7380559p7381521.html

Does it work OK at 100 watts?  I had a similar problem several years ago with a different amplifier.  Everything worked well up to about 300-watts, then the amp would trip out.  Turned out to be a bad UHF elbow that arc'd at high power.  

Phil - AD5X

Something in the antenna or feedline connection might be arcing.

73,
matt W6NIA

On Fri, 16 Mar 2012 18:41:06 -0500, you wrote:

>I put up a 40 meter vertical with elevated ground plane today. The swr
>is 1:1 at the bottom of the band (where I operate). For some reason,
>after sending a few characters, the KPA 500 suddenly shows high swr and
>faults. After resetting, the cycle begins again. I have an analog
>swr/watt meter following the KPA500, and it does not show the swr
>change. It has also done this on my 80 meter antenna. What is going on?
>
>Bob
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