Long range wireless alarm monitoring system

Details Long range wireless alarm monitoring system Long range wireless alarm monitoring system

1984-02-13

1985-04-16

Crosland, Donnie L.

Communications: electrical

Condition responsive indicating system

With particular coupling link

340505, 340514, 340518, 340346, 34082554, 34082504, 455 51, 455 54, 179 5R, G08B 2600

Patent

active

045118876

ABSTRACT:
A security system using a remote sensing unit and a transponder in either one-way or two-way radio communication with a central station. The security system provides for the continuous monitoring of remote points in a particular area from a central station without need of physical connections between the central station and the remote points. The security system further provides the added feature of using redundant code comparison to ensure the validity of the transmitted signal.

REFERENCES:
patent: 3256517 (1966-06-01), Saltzberg et al.
patent: 3418579 (1968-12-01), Hultberg
patent: 3508260 (1970-04-01), Stein
patent: 3593138 (1971-07-01), Dunn
patent: 4191948 (1980-03-01), Stockdale
patent: 4222052 (1980-09-01), Dunn

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