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 <
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To:
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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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