It's been said there are no coincidences. Have you checked your coaxes / connectors? I agree that protection built in should not allow radios to blow finals, but this sounds like too much of a coincidence with two different radios blowing to not be an external intermittent connection. Try wiggling all the cables with low power. Unfortunately, sometimes a problem will only show up as arcing at high power. Is there another HAM near you with a powerful amp and antenna close to yours?
Best of luck, Mark W7MLG On Sat, Feb 16, 2019 at 8:50 AM <li...@w2irt.net> wrote: > Exact same thing happened to my K3s in October, now my KPA-1500. Yeah, So > done here. Once repaired and confirmed working it will be up for sale. > Going > back to a tube amp after this. > > - pjd > > -----Original Message----- > From: elecraft-boun...@mailman.qth.net <elecraft-boun...@mailman.qth.net> > On > Behalf Of Paul Baldock > Sent: Saturday, February 16, 2019 10:28 AM > To: rocke...@gmail.com; elecraft@mailman.qth.net > Subject: Re: [Elecraft] KPA-1500 failed! > > It sounds like one of the output devices have failed. Half power out is > usually the indicator. A number here have reported this happening. > It would be nice to know why this problem is occurring and if Elecraft are > working on a fix. > > - Paul > > At 07:10 AM 2/16/2019, rocke...@gmail.com wrote: > >I talked to Peter on the phone. He has no bias current when amp is > >transmitting with no power applied (key on SSB without talking. He is > >reading 54 volts and has tried power cycling amp from power supply > >switch and reseated all cables. Definitely BAD distortion on SSB (we > >are close enough to hear each other). Looks like one RF device let > >loose and it is dragging down the bias voltage. That is my guess. > > > >Dave wo2x > > > > > >-----Original Message----- > >From: elecraft-boun...@mailman.qth.net > ><elecraft-boun...@mailman.qth.net> On Behalf Of Wes > >Sent: Saturday, February 16, 2019 9:49 AM > >To: elecraft@mailman.qth.net > >Subject: Re: [Elecraft] KPA-1500 failed! > > > >I think a two-tone test is the best evaluation tool.. The generator is > >built into the K3 if you have another receiver that you can use to > >listen to the amp output. I use an SDR-IQ which is a very nice tool > >for this but any other SDR would do. > > > >Sorry for your pain. > > > >Wes N7WS > > > >On 2/16/2019 7:28 AM, li...@w2irt.net wrote: > > > I was operating in the ARRL-CW contest this morning and on 20m, with > > > a > > > 1.2:1 SWR on the Yagi, all of a sudden I saw my power drop to about > > > 450-500W with about 40W in. Worked a few stations but not as easily > > > as when I turned everything on this morning. Switched over to phone > > and made a few contacts. > > > Audio is fine barefoot with 100W out of the K3s-which suffered blown > > > finals itself during CQWW SSB last fall, but with the amp in I got > > > reports that my audio was badly distorted. > > > > > > Before I send it in, is there anything I should look at or any > > > diagnostics I can easily perform? For the cost of this, I'd have > > > thought protection would have kicked in to prevent anything untoward > > > from happening. I'm in complete disbelief, to be honest. > > > > > > --------------------------------------------- > > > 73 and Good DX > > > Peter, W2IRT > > > > > > >______________________________________________________________ > >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 > >rocke...@gmail.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 > >p...@paulbaldock.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 li...@w2irt.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 marklgoldb...@gmail.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 arch...@mail-archive.com
