Rob's web

Improvised R.F. sniffer

Home - Techniek - Electronica - Radiotechniek - Radio amateur bladen - QST - Improvised R.F. sniffer

Conventional vacuum tube voltmeters can be used for antenna coupling and tuning adjustments simply by switching to the a.c. voltage range and plugging a loop of wire into the a.c. input jacks. The loop acts as an r.f. pick-up and the induced r.f. is rectified by the diode in the a.c. circuit.

Frank D. Witmer.