[Elecraft] KPA500 hi swr error

[Phil & Debbie Salas]

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