Is the formula Peak to Peak voltage squared divided by 400 an accurate indicator of RF watts output? I have an accurate digital scope and want to calibrate an Elecraft W1 watt meter I just finished putting together. I have a QCX plus 5 for 40 meters, a QCX mini for 20 meters and a QDX rev4. I would like to know an accurate way to measure output. I also have the QRP Labs dummy load with the ground and RF taps that I use to measure peak to peak voltage. I believe using peak to peak voltage is an accurate method but wanted to make sure?
Thanks,
Glenn WA7SPY
