Fran, First, you said 'tune the load' -- there should be no tuner of any kind on the output of the K2 when measuring power into a 50 ohm dummy load. The varaition of power within any band can and likely is) a result of an input impedance varaition in the tuner. If you are using the KAT2, put it into one of the bypass states (see the KAT2 manual).
Secondly, the accuracy of your power measurement is highly dependent on the dummy load. If you have a good antenna analyzer, check the dummy load at all frequencies of interest - if the dummy load is truly good, it will have a reactance of zero and a pure resistance of 50 ohms. A precision dummy load should be within 1% of those values - if yours is otherwise, you can take steps to calculate the true power, but if there is any evidence of reactance in the load, the math becomes non-trivial. 73, Don W3FPR > -----Original Message----- > > I created what I thought was a reliable method of measuring the > power out of > my K2 and am puzzled by the results. What I did was: > > 1. Built the RF probe from the K2 manual onto a 50 ohm dummy load. > 2. Attach that to one of the antenna connections on my KAT2. > 3. Tune the load on all bands at the band-center frequency to be > measured. > 4. Attach my DMM to the probe connection points. > > The table below shows my voltage measurements and computed power. > I am very > puzzled about 80- meters and have done that one twice without significant > difference. > > The top end of 10 meters resulted in HiCur=3.00 so that one may need some > help but only that one. I am using a 5 amp supply so that should > not be an > issue. > > _______________________________________________ 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
