Lots of good ways to measure QRP power.? I like to sweep a load resistor at the desired frequency to make sure it's a pure 50 ohms resistive and then I use a scope with a carefully compensated probe.? With a nice sine wave, RMS power is a simple calculation.? Another way is to put a 50 ohm load resistor in a thermally insulated box, poke a small hole in the side of the box and measure the temp rise of the resistor with an IR temp gun.? Calibrate the measurement with a DC current thru the resistor.? Again, the resistor has to be pure with little or no reactance at the measurement frequency.? And paint the resistor black to get the emissivity near one.
Dave, kx3dx
