"Tom Bruhns" wrote in message
m...
You may have some trouble getting enough signal with a loop probe
that's short compared with the line length, but you could easily give
it a try. FWIW, I just made some voltage-doubler diode detectors
using HSMS-285C zero-bias Schottky diodes, and get about 20 microvolts
DC output at -50dBm input at 50 ohms. You could get considerably more
output if you have a resonant pickup. You might also be able to use a
non-contact voltage probe. It should work very well with a diode
detector, for low power, actually. Recommend you make the line at
least 1/2 wave long, so that you can be sure to see both a peak and a
valley, no matter what the phase of the load is. Better still, make
it at least 3/4 wave, so you can see two peaks or two valleys.

Cheers,
Tom

Thanks, Tom. Very good advice and I appreciate the Schottky diode lead. I'll
look in to getting some of them.

73,
John