Julian, G4ILO wrote: > I was wondering why my 2m transverter was producing much less output than > when I set it up, so I thought that perhaps I should do the 1 Milliwatt > calibration procedure, which I never have done. I don't, unfortunately, have > an accurate RF voltmeter, but I do have an Elecraft DL1 and a DVM. > > At 1mW requested power I measured 36mV at the DL1 test point, which > according to the formula (.036 x 1.414) + 0.15)^2 / 50 means I am only > getting 0.8mW out. Is it OK to use the DL1 and this formula at this power > level? >
The formula assumes a constant 150 mV voltage drop across the diode, i.e. that it is conducting during a half cycle. At the level you are measuring, things are more complicated. So I wouldn't rely on the formula. Things you could do: 1. Make an amplifier, and calibrate it. 2. Borrow a scope to make the measurement. You probably have to do this in order to do (1), as well. 3. Make a computer model in spice, and tweak until you get the the measured voltage. Spice wasn't around when I was studying circuits, but the DL1 looks simple enough to be a great case for learning it. 73 Jon LA4RT ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
