Slater, You likely do not have a problem. Take away the antenna, in-line SWR meter, and the ATU - and substitute a good 50 ohm dummy load. Be certain it is 50 ohms resistive and has no capacitive or inductive component at the frequency you want to do your testing (you can measure it with an antenna analyzer).
Use an RF Probe to measure the RF across the dummy load and use the formula V^2 divided by R to calculate the power present and compare that with the indication shown on the K2. The RF Probe will be much more accurate than most wattmeters - but the condition is that you must know th eimpedance of the load accurately. Wattmeters can be off by as much as 20% of the full scale reading, and when using a 200 watt scale, that is 40 watts! Some are better, but many are not - if you need validation of that, check out the accuracy reports in the ARRL lab tests. BTW, the basic K2 uses an RF Probe type measuring device to determine power output, and is usually quite accurate as long as the load on the antenna jack is 50 ohms resistive. With other loads, the power indication will not be accurate. The KAT2, KPA100 and KAT100 do contain wattmeters reather than the RF Probe, but they must be calibrated accurately if good readings are to be expected (the dummy load and RF Probe method I mentioned above is good for achieving good calibration). 73, Don W3FPR > -----Original Message----- > > I have noticed an irregularity on my K2 output. > > When setting the power level a 2 watts, and then using the ATU I get a > reading on my SWR/power meter in the line of 4 watts. Setting power > on the K2 to 3 watts, I get 4 watts on the in line meter. I thought the > meter might be faulty, so replaced it with another with the same > result. And the ATU gives me a reading of, say 1.3:1, whereas the > SWR/power unit shows 3:1. > > Do I have a problem. If so, how do you suggest I address it? > > Thanks > Slater VE5OA > SN 4519 > > _______________________________________________ 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
