[Elecraft] KPA1500 in the IARU Contest Last Weekend

[donovanf at starpower.net]

Or water... 


Are you sure your coaxial cable, balun and connectors are all dry? 


>From your description, the last thing I'd examine is the KPA1500 


Good luck! 


73 
Frank 
W3LPL 



On Wed, Jul 15, 2020 at 11:19 AM Nr4c <nr4c at widomaker.com> wrote: 

> My first thought is “Heat”! 
> 
> 
> Sent from my iPhone 
> ...nr4c. bill 
> 
> 
> > On Jul 15, 2020, at 4:43 AM, Ray Spreadbury via Elecraft < 
> elecraft at mailman.qth.net> wrote: 
> > 
> > Hi 
> > 
> > I was a member of the UK HQ team for this 24hour IARU event last weekend 
> and 
> > was one of the two Ops on 40M SSB. 
> > 
> > We took it in turns to be the Run station every 4 hours and I was using a 
> > 40M 2-El yagi at 60ft. I noticed that every 30-60mins, I needed to do a 
> > re-tune on the KPA1500 to keep the SWR at or near to 1.1:1, as it seemed 
> to 
> > gradually creep up over time. The amp temp peaked at 70C but was mostly 
> at 
> > about 55C. The SWR never got above 1.5:1 using KPA1500 screen but I know 
> > that the yagi was really presenting about 1.6:1 at the run frequency. 
> When 
> > not operating as the Run station the other Op was in Partner mode 
> spotting 
> > mults & helping with call identification. 
> > 
> > We were using the WinTest logging program as this enables us to private 
> > network with the other UK HQ stations (one on CW & one on SSB for each 
> > contest band ie. a total 12 stations at any one time, plus Partners). 
> > Because of Covid, this year we were all single Ops working from home 
> rather 
> > than just a few multi op stations. 
> > 
> > My K3S & the KPA1500 worked faultlessly for the 24hours as did Wintest 
> but I 
> > wonder what was the cause of the SWR increasing over time & needing a 
> > re-tune? 
> > 
> > 73 Ray G3XLG 
> > 
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