Transmitter detector

Details Transmitter detector Transmitter detector

1980-08-22

1983-01-11

Ng, Jin F.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455226, 455227, 324 77C, H03J 718, H04B 1700, H04B 116

Patent

active

043685390

ABSTRACT:
Method and apparatus for detecting a transmitter. The harmonics of an incrementally increasing fundamental frequency are mixed with input signals thus forming intermediate frequency signals. Frequencies occupied by background transmitters are identified by surveying the r-f spectrum at a remote point; these frequencies are then bypassed when scanning is performed in the area to be secured. Another method is also disclosed wherein an operator scans the r-f spectrum in an area, and records indications corresponding to the frequencies of signals not emanating from eavesdropping devices so that those frequencies will be bypassed on subsequent scans.

REFERENCES:
patent: 3449749 (1969-06-01), McEvoy
patent: 3473127 (1969-10-01), Williams et al.
patent: 3701949 (1972-10-01), Turkish
patent: 3932814 (1976-01-01), Niki
patent: 4001695 (1977-01-01), Hrbacek et al.
patent: 4063169 (1977-12-01), Palmer
patent: 4063179 (1977-12-01), Brown
patent: 4118666 (1978-10-01), Bernstein
patent: 4238727 (1980-12-01), Madni
"Scanlock Mark VB", Publication from Technical Services Agency, Inc.

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