It wouldn’t be above your skill level if they would release the schematics. Solid state amps are not any more complicated than tube amps, and I think easier (and safer!) than tubes. My early KPA1500 (#76) has been great, but not having the schematics really bugs me. I know everyone at Space Galactic Headquarters is busy with the K4 but posting the KPA1500 schematics would not take more than a few minutes. And my amp is way out of warranty so they aren’t risking anything. Internally it looks like a pretty generic design. I’ve reverse engineered the power supply unit but the RF deck is going to take some time. I’d rather not if I don’t have to.
Ken K6MR From: Dana Roode K6NR<mailto:[email protected]> Sent: Sunday, February 21, 2021 11:03 To: Frank Scolaro<mailto:[email protected]> Cc: Elecraft Reflector<mailto:[email protected]> Subject: Re: [Elecraft] Sudden KpA1500 power reduction Ok thanks everyone, I will lug the amp back home and contact Elecraft. Ive had it for about 2 years, everything breaks now and again. I've got my AL1200 here, I could use it at least when I'm here locally. I can't count how many times I repaired that amp. But the KPA is above my skill level. Dana On Sun, Feb 21, 2021 at 9:32 AM Frank Scolaro <[email protected]> wrote: > > Happened to me several months ago... one LDMOS out! same symptoms. You > need the power with such great band conditions... > > GL > Frank, W2YK > > > > > -----Original Message----- > >From: [email protected] > >Sent: Feb 21, 2021 12:23 PM > >To: 'Dana Roode K6NR' <[email protected]>, 'Elecraft Reflector' < > [email protected]> > >Subject: Re: [Elecraft] Sudden KpA1500 power reduction > > > >Just my guess is one of the LDMOS devices let out the magic smoke? > >Just a thought... > > > >Dave wo2x > > > > > >-----Original Message----- > >From: [email protected] <[email protected]> > On > >Behalf Of Dana Roode K6NR > >Sent: Saturday, February 20, 2021 9:16 PM > >To: Elecraft Reflector <[email protected]> > >Subject: [Elecraft] Sudden KpA1500 power reduction > > > >I'm in the ARRL CW contest this weekend and the KPA1500 has been working > >fine. However, a few minutes ago I noticed I was getting about half the > >output power on 20 meters that I typically get with around 30 watts drive > >(about 600w vs 1200w). PA current is less than normal, around 30a. > >Similar problem on the higher bands, I can no longer get 1000w. On 40m I > >can, but it requires more drive. > > > >Seems like something died in the amp; I'm not familiar with the design, > but > >perhaps an output module. No errors or ill behavior from the amp other > than > >the loss of power. > > > >I will contact Elecraft support unless there is something I'm missing > here. > >I just looked in the archive and see that this has happened to > others.... I > >use the amp remotely so I guess I'll have to take it home with me. > > > > Dana > >______________________________________________________________ > >Elecraft mailing list > >Home: http://mailman.qth.net/mailman/listinfo/elecraft > >Help: http://mailman.qth.net/mmfaq.htm > >Post: mailto:[email protected] > > > >This list hosted by: http://www.qsl.net > >Please help support this email list: http://www.qsl.net/donate.html > Message > >delivered to [email protected] > > > >______________________________________________________________ > >Elecraft mailing list > >Home: http://mailman.qth.net/mailman/listinfo/elecraft > >Help: http://mailman.qth.net/mmfaq.htm > >Post: mailto:[email protected] > > > >This list hosted by: http://www.qsl.net > >Please help support this email list: http://www.qsl.net/donate.html > >Message delivered to [email protected] > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
