Don, Ok, but why always on the low side and not the hi side of error? 2 to 3 watts out of 10 is 20% which is not that good, and why only at the higher frequencies? On 10 meters, it might say 12 watts out but only give 8 actual watts.... I want to know why it rolls off at the higher frequencies, that is, the built in meter reads higher than actual power.
I suppose I should also test the rig at 14 volts, just to see what the power out is. The manual states that all the measurements were done at 14 volts and I have been doing them at 13.8 key up. My supply is regulated, but not that regulated.. And I wonder what sets the efficiency, output power VS current and voltage in. Would that mostly be T3? Eventually I might want to tweak that! You can likely tell I like playing with radios more than actually operating them, that is why the shack is almost all home brew.... Well, maybe tonight I will do the spectrogram stuff! Brett N2DTS > > You may find some frequency dependency between 1N5711 diodes (I have > occasionally noticed that), but I do not consider it a > problem because > the power indication and control point are not more than a > few tenths of > a watt off at any point if all is normal. Considering that most > wattmeter specs are in the range of 5% to 20% OF THE FULL > SCALE READING, > the diode detector in the K2 is actually more accurate than > most if the > load is 50 ohms resistive at the frequency of operation (measuring > with an ohmmeter is not suficient, resistance at DC is not > likely to be > equal to the resistance at RF). > > On your wattmeter accuracy, consider that even 5% of the 20 > watt scale > can result in an error of 1 watt at any power level - and > even the Bird > wattmeter is only that good immediately after calibration - you must > expect such errors in your measuring equipment (check the > spec sheet and > verify the measurement by independent means if you really want > accuracy). The Diode Detector is actually more accurate than most > wattmeters, but it must be used with a known good non-reactive load. > > > 73, > Don W3FPR > _______________________________________________ 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
