Second try - it posted mid typing for no discernible reason and I can't find an edit or delete
I am seeing about a 2x variation in power draw on my uBitx with different dummy loads and a well tuned antenna. Here are the results with average measurements taken over two days on 40 meters. My 25 amp power supply provides 13.75 volts. Dummy 1 was made from a kit, has a DC resistance of 50 ohms and provides a diode & cap for DVM sampling. Dummy 2 is an MFJ that measures 55 ohms which yields about a 1.1:1? SWR. The antenna is feed through a tuner that reports a 1.1:1 SWR after tuning.
???? ? ? Dummy 1?? Dummy 2?? Antenna
recv????? .17??????????? .12 ??????????? .11
PTT????? .60?????????? .34 ???????????? .32
CW???? 1.42????????? .77 ???????????? .75
Sampling dummy 1 with a DVM yields 22.9 volts or about 5.4 watts.
Questions:
? Why are the current draws different, particularly on receive?
? Am I only getting 2.5 watts out to my antenna?
?? Bob
Bob Benedict, KD8CGH