[Elecraft] KPA500 hi swr error

[WILLIS COOKE]

I have had some arcing at 500 watts with my Radio Works 160 meter Carolina Windom which did not happen at lower power and other frequencies.  I suspect it is power and SWR related.
 
Willis 'Cookie' Cooke 
K5EWJ & Trustee N5BPS, USS Cavalla, USS Stewart


________________________________
 From: Phil & Debbie Salas <dpsalas at tx.rr.com>
To: elecraft at mailman.qth.net 
Sent: Saturday, March 17, 2012 6:18 AM
Subject: Re: [Elecraft] KPA500 hi swr error
 
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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