Hi All, I've just spent the day fine tuning my KPA100 - measuring the output power on each band and trying to improve it. Initially I was getting a HI Current warning on each of the bands from 160 through to 40 (all into a dummy load), but not on the rest. In all cases the maximum power I could get out on each band was 50-65W. I reset R26/R27 and the bias current and now the HI Current warning has gone and power output has improved on most bands to 70+W, but is not yet 100W. Some observations and questions that came up:
Can someone please explain to me how the HI Current warning is generated? Is it likely that my bias current is a little low? I swept the low pass filters with an antenna analyser and the SWR on 30m and 10m is about 1.5. All the components look to be right, and I feel that spreading or compressing the turns on the applicable torroids may upset the associated filters. Is 1.5 too high (I have the previous version of the KPA100 firmware)? Is the new KPA Capacitor mod likely to help? Mike VK1KCK K2 #2599 _______________________________________________ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
