Using a 10 GHz Gunnplexer. Oscilloscope shows a "fan modulated" 32768 Hz signal input to the lock-in amplifier. Note how removing the Gunnplexer's lock-in reference...
Decatur MV-715 Range Master X-band (10.525 GHz) police radar gun modified for use as a remote surveillance device. There are 5 different audio recordings in...
Audio test of the GBPPR Speech Jammer system. The parametric speaker is underpowered so the range (or effectiveness) isn't too great. The "speech jammer" works...
Intercepting telephone audio using a slightly modified Decatur RM-715 Range Master X-band doppler radar. Audio is the dial tone, then the "If you'd like to...
Experimental device to detect the faint 15.75 kHz horizontal syncronization frequency emitted by a NTSC video camera. The idea is to use this device to...