Communications: electrical – Condition responsive indicating system – With particular coupling link
Patent
1975-03-05
1979-04-03
Swann, III, Glen R.
Communications: electrical
Condition responsive indicating system
With particular coupling link
179 82, 340521, 340545, 340584, 340693, G08B 1900
Patent
active
041480198
ABSTRACT:
A security alarm transmission system for protecting a building includes a plurality of alarm transmitter units each having a transmitter circuit controlled by associated condition sensors to generate coded alarm signals which are inductively coupled to a pick-up loop extending around the periphery of the building and extended to a receiver connected to the loop which decodes the alarm signals and provides a suitable alarm indication. The alarm transmitter unit is adaptable to provide different alarm outputs for indicating fire in the building or an unauthorized entry of the building, or an emergency condition, for example. The multipurpose alarm transmitter unit comprises a housing unit for containing the transmitter circuit, the housing permitting the transmitter circuit to be controlled by normally open or normally closed switches, and a mounting assembly which permits convenient installation of the transmitter unit at desired locations.
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EXAR Integrated Sys. Inc., "Monolithic Phase-Locked Loop", XR215, Jul. 1972.
Swann III Glen R.
Thomas Industries Inc.
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