On-line test circuit for intrusion alarm systems

Details On-line test circuit for intrusion alarm systems On-line test circuit for intrusion alarm systems

1974-05-31

1976-01-13

Caldwell, John W.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340214, 343 177, G08B 2900

Patent

active

039328708

ABSTRACT:
For use in an intrusion alarm system, an on-line test circuit operative for the continuous supervision of system operation without affecting normal operation thereof. The transmitted signal is frequently modulated at a low rate to produce a detectable change in reflected energy sensed by sub-Doppler processing circuitry and operative to produce a failure indication in the absence of such sub-Doppler signal.

REFERENCES:
patent: 3465336 (1969-09-01), Fishbein et al.
patent: 3697989 (1972-10-01), Bailey et al.
patent: 3820114 (1974-06-01), Green
patent: R23820 (1954-05-01), Bagno

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