Michael Idvorsky Pupin, Serb immigrant boy, now professor of electromechanics, Columbia University; inventor of electrical "tuning," the resonator, inductance coil, etc.
The microwaves are bounced off the resonator, carrying the vibrations back to the eavesdropper's receiver.
RF Source provides true sinewave output with low phase noise. Designed using surface acoustic wave resonator technology, 2 GHz Model CRFS75-2000 features -134 dBc/Hz phase noise at 10 KHz offset and noise floor of -164 dBc/Hz. Source has no sub-harmonics; second harmonic is -20 dBc typical, and frequency accuracy is rated at ±150 ppm. With 5 V input voltage, device generates true sinewave with +5 dBm minimum output power. Housed in 0.75 x 0.75 in. SMT ...
June 10, 2013 - ThomasNet
Robert Ulrich in Los Angeles Times When you talk about musical instruments,Ulrich said, "who wouldn't want to hit a great big gong from Indonesia, a gamelan from Bali, or pluck at a harp from Peru or play a resonator marimba from Africa. It's just so cool to have that kind...