Communications: electrical – Condition responsive indicating system – With particular coupling link
Patent
1982-07-26
1985-07-23
Crosland, Donnie L.
Communications: electrical
Condition responsive indicating system
With particular coupling link
340527, 340531, 455 63, G08B 108
Patent
active
045311153
ABSTRACT:
A remote alarm system provides a transmitter having an audio frequency signal generator circuit, a modulator circuit forming a current source modulated by the audio frequency signal and a radio frequency oscillator circuit modulated by the current source, and a receiver having a super-regenerative detector, an amplifier connected thereto, a notch filter for selectively filtering the audio frequency signal, an alternating current rectifier for rectifying the audio frequency signal, a delay circuit for delaying activation of an alarm signal until a signal from the rectifier circuit is present for a predetermined amount of time and for determining a period of time for activation of an alarm signal, and an alarm means for generating an alarm signal in response to the output of the delay circuit.
REFERENCES:
patent: 3544987 (1970-12-01), McMann, Jr. et al.
patent: 3833895 (1974-09-01), Fecteau
patent: 4148020 (1979-04-01), Siemer et al.
patent: 4157540 (1979-06-01), Oros
Black Donald
Pirtle James D.
Crosland Donnie L.
Emhart Industries Inc.
Meyer Robert F.
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