Microphone amplifier detector

Details Microphone amplifier detector Microphone amplifier detector

1967-08-25

1991-06-11

Tarcza, Thomas H.

Communications: directive radio wave systems and devices (e.g.,

Combined with diverse type radiant energy system

367128, G01S 1374

Patent

active

050236164

ABSTRACT:
A device for detecting a covert transmitter having a time varying impedance therein including a radio frequency transmitter and an audio frequency transmitter which are directed so as to illuminate a target area. The audio tone drives the active elements into a non-linear mode of operation to modulate the transmitted radio frequency. The re-radiated energy is detected by a further radio frequency receiver.

REFERENCES:
patent: 2823365 (1958-02-01), Rines
patent: 2927321 (1960-03-01), Harris
patent: 3036295 (1962-05-01), Kleist
patent: 3391404 (1968-07-01), Vogelman

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