Evidently the wattmeter is not a problem. The KAT2's power meter seems fine (eg, believable). I checked with a 200MHz bandwidth scope and the results are shown below. I'll dig around the transformers a bit. What's the current thinking on the 160 inefficiency?
Dan / WG4S / K2 #2456 K4ZM sez: <snip> Don't overlook the fact that most wattmeters have a roll off of accuracy when you get ot the 24/28 MHz frequencies. They tend to indicate a lower than actual output. </snip> Freq KAT2 Amp O'scope Calc 1.8 9.9 4.7 3.6 13.0 3.5 13.9 3.0 4.1 16.8 7.0 14.4 2.9 4.1 16.8 10.1 13.1 3.0 3.8 14.4 14.0 12.9 2.7 3.6 13.0 18.1 14.2 3.0 3.7 13.7 21.0 11.6 3.1 3.2 10.2 24.9 9.3 2.5 2.8 7.8 28.0 5.8 2.3 2.4 5.8 O'scope figures are p-p/2 at 10X. Calc is (Scope * 7.07)^2 / 50 _______________________________________________ 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
