Just finishing up building my KPA100 and performing transmiter testing and noticed I was only able to get a reading of 93w on 12m (one the K2 display), while I could get 100w+ on all other bands. Current drain on 12m was similar to all other bands (less than 18A by measuring voltage drop across R7.) Forward power was calibrated at 20w level using the RF probe provided in the base K2 kit across 50 ohm non-inductive dummy load. Forward power indication on all bands on my MFJ tuner's meter was 10-25w higher than the indication on the K2 itself, but I don't really trust its accuracy. I wouldn't guess a low pass filter issue as it is shared between 15/12/10m, and output was fine on 15m and 10m, but I haven't swept the LPF with an SWR analyzer or anything, since I don't own one. Could this low power be caused by incorrect bias current setting? I found this setting to be quite tricky, and I'm not for sure I got it right. I was using a digital meter to do the measurement, and I found the display update delay to make the setting difficult. I was using a Fluke 111, and the display blipped through approximately .5A on its way to approximately .8A, which was my target setting. Any insight would be appreciated.
-Ben K1NT _______________________________________________ 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
