H - Electricity – 04 – B
Patent
H - Electricity
04
B
325/38, 340/79
H04B 3/54 (2006.01) A01K 29/00 (2006.01) G08B 17/00 (2006.01) G08B 19/00 (2006.01)
Patent
CA 1116699
Abstract An alarm system for transmitting an alarm signal between remote locations utilizing frequency shift keying over conventional power lines. The alarm system includes a transmitter having a nominal frequency and circuitry for modulating the transmitter frequency. Upon detection of an alarm condition the modulating circuitry is disabled. A receiver is provided and has circuitry for detecting the presence or absence of modulation of the trans- mitter frequency. The receiver generates an alarm signal upon detection of absence of modulation and power failure of the system. The alarm signal is time-delayed to prevent nuisance alarms.
309702
Farland Swen E.
Siemer Dennis K.
Barrigar & Moss
Farland Swen E.
Siemer Dennis K.
LandOfFree
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