I have the same 'issue' on 20m my SWR on the hustler 6BTV is 1.4but when I operate on that band the internal temperature seems to risemuch faster than other bands and I eventually get a fault.
On 40m I have similar SWR on the digital frequencies and there I don't havean issue what so ever. I can work long time with higher output powers (like double that of 20m)
It does seem a tuner is required even with lower SWR's due to some reason ..
73 de K6TE Wim
On 12/18/2016 6:08 AM, Joe Hutchens AJ8MH-Radio wrote:
> This is a question I've been wanting to ask...
>
> I've had a KPA500 for 4 years and I've noticed that 20 meters requires
> more drive. Most bands require 30 watts or less, but 20 requires 35-37
> for 500 watts out. In the phone portion of 20, an SWR of 1.4:1 WILL
> cause a fault. It's just real sensitive to the load on 20. I have to
> use a tuner and make sure I'm close to 1.1:1. Works fine into a dummy
> load, but high drive is still required.
>
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