One thing you might check is whether or not your K3 has thermal pads between the LPA transistors and where they bolt to the bottom cover. I ran across this when doing some mods and the instructions said to reinstall them but my early 4xxx K3/100F didn't have them. When I asked the Elecraft tech he said they were added because of the higher duty cycle digital modes. As a minimum make sure those screws are tight.
73, Brian, K0DTJ > On May 22, 2020, at 16:03, Eric KG6MZS <[email protected]> wrote: > > Hello All, > > I’ve searched the reflector's archives and haven’t found anything on this, so > here goes. > > I have an aging K3/1000 (sn 3045) and I wish to preserve its operating life. > Up until now I’ve mostly operated in SSB and BPSK. Recently I’ve been > exploring some 100% duty cycle modes and I am wondering what would be a > prudent power level for these modes. Or perhaps there is a temperature limit > that should be observed on the KPA3’s heat sink? > > Suggestions? > > TIA, > Eric Fitzgerald > KG6MZS > > ______________________________________________________________ > 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]
