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 arch...@mail-archive.com
