Randy, Don said: > > The WM2 must be calibrated and verified before it can be trusted, and > similarly the wattmeter section of the KAT2, KAT100 and KPA100 must be > calibrated before they can be trusted. After any of these instruments > have been calibrated, the dependency on the precise 50 ohm dummy load > goes away. but some instruments will indicate forward power and reverse > power, and the two must be subtracted for the net power, while others > will do that calculation automatically. As a user, you must know the > characteristics of your measuring instrument before you can correctly > interpret its readings. >
Don is very correct in this. I have a WM-2 and found it to be "way off" when adjusted according to the instructions and working into a 50 ohm load. I finally hung a scope on the input to the dummy load and set my K2 to 40m and 5 watts. I adjusted the WM-2 to read the calculated input power at the dummy load based on the pk-pk signal. The K2 and WM-2 were then "close enough" with each other on 40m. Since then, I have relied on the K2 power output. Vy 73 Jay AJ4AY Mobile, AL No virus found in this outgoing message. Checked by AVG - http://www.avg.com Version: 8.0.173 / Virus Database: 270.7.6/1709 - Release Date: 10/5/2008 9:20 AM _______________________________________________ Elecraft mailing list Post to: [email protected] 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
