Intrusion detector

Details Intrusion detector Intrusion detector

1981-05-21

1983-11-15

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

340553, G08B 1324

Patent

active

044158858

ABSTRACT:
An intrusion detector is provided having transmission and receiving cables wherein the cables are leaky from an RF standpoint so that a portion of the RF energy from the transmission cable escapes and is picked up on the receiving cable. Both sine and cosine signals are detected. The cables can be buried.

REFERENCES:
patent: 3794992 (1974-02-01), Gehman
patent: 4053877 (1977-10-01), Torlesse et al.
patent: 4091367 (1978-05-01), Harman
patent: 4135185 (1979-01-01), Rotman et al.
patent: 4207560 (1980-06-01), Poirier
patent: 4213123 (1980-07-01), Poirier
patent: 4224607 (1980-09-01), Poirier et al.

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