My friend had similar problem. It cause was that LPA was not tightly attached to K3 bottom cover. After retighten the screw attaching the LPA to bottom cover, the problem was solved. I hope this helps.
73 de JH3SIF, Keith > 2018/03/28 13:51、Erik Basilier <ebasil...@cox.net>のメール: > > Same result if the K3 is run at 12W without the KPA500. This is a K3 I > bought used; I guess I may have forgotten to check the power calibrations on > it. Will try that next. > 73, > Erik K7TV > > -----Original Message----- > From: elecraft-boun...@mailman.qth.net <elecraft-boun...@mailman.qth.net> On > Behalf Of Erik Basilier > Sent: Tuesday, March 27, 2018 9:42 PM > To: Elecraft@mailman.qth.net > Subject: [Elecraft] K3 powers off when after several minutes of 12W carrier > > I have been testing sustained power capabilities of wideband HF transformers > for feeding EFHW antennas. This involves running high power through HF > transformers back to back into a dummy load. When running 200W out of the > KPA500, the K3 was indicating 12W, and I think that means the 100W PA was > not operating. After a few minutes the K3 totally shut down. This had > nothing to do with the transformers under test; I get the same result when > running the KPA500 at 200W directly into the dummy load. After restart the > K3 shows no sign of problem unless the 200W endurance test is run again. > Then I increased power just a little bit so that the 100W stage kicked in. I > got 300W out of the KPA500, and now the K3 keeps going without shutting > down. I can see how 12W may be a bit much for the driver stage, but if so, > shouldn't the 100W stage kick in sooner? Also, I expected the K3/KPA500 > combo to be able to produce any power level I wanted within its range. What > I see is that when the 100W stage kicks in, the output (as seen on an analog > meter) makes a big jump so that certain power levels cannot be achieved. > > Thanks, > Erik K7TV > > ______________________________________________________________ > 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 ebasil...@cox.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 jh3...@sumaq.jp ______________________________________________________________ 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
