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 <n...@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@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 > > > > ______________________________________________________________ > > Elecraft mailing list > > Home: http://mailman.qth.net/mailman/listinfo/elecraft > > Help: http://mailman.qth.net/mmfaq.htm > > Post: mailto:Elecraft@mailman.qth.net > > > > This list hosted by: http://www.qsl.net > > Please help support this email list: http://www.qsl.net/donate.html > > Message delivered to n...@widomaker.com > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to j...@jtmiller.com ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to donov...@starpower.net ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
