Supervised loop alarm radio transmitter system

Details Supervised loop alarm radio transmitter system Supervised loop alarm radio transmitter system

1978-03-09

1979-08-07

Waring, Alvin H.

Communications: electrical

Condition responsive indicating system

With particular coupling link

340510, 325 64, G08B 2500

Patent

active

041639685

ABSTRACT:
In order to assure that an alarm signal is transmitted, whether in the case of a true alarm condition or tampering, whether advertent or inadvertent, without any significant increase in power requirements, an alarm radio transmitter system is provided with a supervised loop which controls an electronic switch for connecting the power source (a single battery) to energize the transmitter for a brief interval of time only when an alarm condition or tampering occurs. The supervised loop is part of a bridge circuit also connected to the power source which draws a minimum amount of current therefrom. The alarm radio transmitter system may be remotely located where attention is not available, since the battery need only be infrequently changed.

REFERENCES:
patent: 2871466 (1959-01-01), Vassil et al.
patent: 3553687 (1971-01-01), Reiss
patent: 3665475 (1972-05-01), Gram

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