Alarm transmission system

Details Alarm transmission system Alarm transmission system

1980-06-18

1982-11-09

Waring, Alvin H.

Communications: electrical

Condition responsive indicating system

With particular coupling link

340521, 340524, 340554, 3408257, G08B 1300

Patent

active

043587569

ABSTRACT:
An alarm transmission system with portable receivers for watching a site, which system comprises a plurality of portable and removable autonomous detection units, a plurality of portable autonomous receiving modules capable of releasing signalling or warning means incorporated to the said receiving modules upon receipt of signals sent by a transmission unit and a central information-receiving and processing unit equipped with at least one receiving module, and in which system the signal transmission unit is constituted on the one hand by radio-transmission and coding means associated to each detection unit and on the other hand by means of reception by radio-link and decoding means incorporated to each portable receiving module.

REFERENCES:
patent: 3869669 (1975-03-01), Eldert et al.
patent: 3909826 (1975-09-01), Schildmeir et al.
patent: 4247846 (1981-01-01), Zedler
Wigger; "Remote Radio Alarm Systems"; May/Jun. 1968; 8 pp.
Jackson; "Portable RF Alarm Link System"; Apr. 1977; pp. 218-220.

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