At lunch I did some more tests. I made a dummy load using 4 200 ohm 2 watt resistors, measured the resistance at 50 ohms, and plugged that right into the watt meter. The other end of the wattmeter plugged into the K2 antenna jack using adaptors.
I did the tx setup per the book, and now have at least 10 watts out on all bands, but it does roll off on the higher bands. 10 meters might be below 10 watts, I don't remember. 80 and 40 meters do about 13 or 14 watts. What the 'tune' button seems to do is measure the rf out per a set power (2 watts), display it, and when out of the tune mode, corrects the power so its right. You can really see it work on 80 and 40 meters, set the power knob to 2 watts, hi the tune button and the meters read 3 watts. Exit the tune mode with the power still set at 2 watts and hit the cw key and I get 2 watts out on the bar graph and my meter. This works a treat on 80, 40, and 30 meters, the power output matches the knob set point and the bar graph very closely AFTER you do the tune setup, at least up past 10 or 12 watts. Above about 30 meters, the bar graph and the tune position start showing more power then the 3 watt meters I have do, I have some diwa little thing, a Kenwood average/pep meter, and the heathkit antenna tuner meter. All read the same. The higher you go above 30 meters, the more the rig says its doing more power out then my meters do. The RF sense circuit is after all the stages, its at the antenna output basically.. I checked all the components in the rf output sense circuit and they are the correct values and measure correctly. I did not mess with the diode (D9 1N5711), nor can I verify its number without unsoldering it. Maybe I should order a few 1N5711 diodes and see if there is any difference in how they act. This sure is a fun rig to trouble shoot and play with, although I am still not over fond of computers in HF gear... Brett N2DTS > > Hi Brett: > > >I also tried two coax cables between the rig and the watt meter, > >which also agrees when I hook up the antenna and tune it for > >a low swr, the power outputs on the heath antenna tuner agree > >with the other watt meter. > > How long are the coaxes you're using between the wattmeter and the > dummy load? And are there any antenna switches in-line or > anything else? > > Also, what length coax between K2 and wattmeter? > > 73, > > Tom > _______________________________________________ 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
