This happened to me too on 40 meters with an antenna that was less than 2:1 SWR. There are a lot of factors that can impact the longevity of the parts in the amp... over voltage/ over current can happen depending on the components of the impedance.
-----Original Message----- From: elecraft-boun...@mailman.qth.net [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Tom KG3V Sent: Sunday, March 31, 2019 2:30 PM To: elecraft@mailman.qth.net Subject: [Elecraft] KPA-500 No Power out on 80 meters I believe I have fried the 80 meter circuitry in my KPA-500. I am contacting Elecraft about possible repairs, but would also be interested in other's input. Here is what happened: I was using a multi-band antenna and the SWR was high on 80m. I use a KAT-500 with the Amp at all times. My (naive) thinking was that if the KAT-500 could successfully tune it, the Amp was safe. In the past, this seemed to have been the case. I use an IC-7600 and have the KEY line connected, as well as the PA KEY line between the Tuner and the Amp. Every time I changed frequencies on the 80 meter Band, I would TUNE before operating. At one point, I noticed "that smell" of hot components, and was then unable to transmit on 80 meters. In testing this morning, I get no output from the Amp on 80 meters only. All other Bands seem to be fine. I can use 80 meters with the Amp in Bypass mode, so I do not suspect a problem with the Tuner. Today, it continues to work fine on several other bands with full power output. Thanks for any suggestions 73, Tom, KG3V -- Get on the Air and make some noise Ham Blog at WWW.KG3V.COM --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus ______________________________________________________________ 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 --- This email has been checked for viruses by AVG. https://www.avg.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
