KPA-500 No Power out on 80 meters
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KPA-500 No Power out on 80 meters
 
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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:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
Re: KPA-500 No Power out on 80 meters
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Tom
I did something similar on 6M, but I fixed it myself. 2 things. One, pull the logs off the Amp and that will tell the story. Next, you will have to open it up and see if you have burned anything in the LPF board. It will be pretty obvious. If you are ok with working on that, it is fixable. If not, you'll have to send it home for a repair. Mike va3mw On Sun, Mar 31, 2019 at 3:30 PM Tom KG3V <[hidden email]> wrote: > 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:[hidden email] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
Re: KPA-500 No Power out on 80 meters
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In reply to this post by Tom Zeltwanger
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: [hidden email] [mailto:[hidden email]] On Behalf Of Tom KG3V Sent: Sunday, March 31, 2019 2:30 PM To: [hidden email] 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:[hidden email] 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:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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