I have K3IO failures as well. Robie AJ4F
On Wed, Jun 22, 2022, 6:57 AM Dr. William J. Schmidt <b...@wjschmidt.com> wrote: > > My K3 failures always come in the form of either K3IOx failures (extremely > common) or the 10W module. Everything else seems to hang together. > > -----Original Message----- > From: elecraft-boun...@mailman.qth.net <elecraft-boun...@mailman.qth.net> > On > Behalf Of Geert Jan de Groot > Sent: Wednesday, June 22, 2022 3:30 AM > To: elecraft@mailman.qth.net > Subject: [POSSIBLE SPAM] [Elecraft] Common K3 failure modes??? > > On 22/06/2022 02:50, elecraft-requ...@mailman.qth.net wrote: > > With more K3 radios broken on the bench than working at my contest > > station > > (J68HZ) and NO spare modules to work with, > > I am actually wondering about that. One of the magazines I read, the German > Funkamateur magazine, has a story each month about a group doing some > DXpedition and nearly every month they report about equipment getting > broken > during such an event. As these things often use Elecraft, there are reports > of K3's failing. > > But I wonder the failure mode because the stories don't report anything > about that. I know of a few failure modes: > - Diodes at input blown up because of extremely strong signals > near-frequency. Bandfilters may help, as does careful frequency planning > and > some antenna distance. (ages ago I used a FT747 which uses a light bulb as > protection - after a heavy radio weekend I had the lightbulb open and one > of > the input coils fused!) > - PA kickback causing the low-power amplifier transistors to fail - there > has been discussion on the list to add transzorb diodes > - Encoders for filter settings etc may fail - easy to replace > - volume knob was bumped on, causing potmeter broken - just replaced it > - Plastic knobs cracked - partially solved by Elecraft warranty, partly > solved by buying new ones myself ($$$$ with shipping and customs) > - Audio amplifier dying because of a short circuit at the output. There is > a > mod kit for that. > > I wonder about other failure modes. How does a K3 die at a contest station, > or a DXpedition, and what can be done to prevent? > What are the failures on the broken radios you are reporting about? > > 73, > > Geert Jan PE1HZG > > > ______________________________________________________________ > 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 b...@wjschmidt.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 rule...@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
