Security system with saw transmitter

Details Security system with saw transmitter Security system with saw transmitter

G - Physics

08

B

325/44

G08B 25/00 (2006.01) G08B 25/10 (2006.01) H03B 5/04 (2006.01) H03C 3/20 (2006.01) H04L 27/12 (2006.01)

Patent

CA 1279899

SECURITY SYSTEM WITH SAW TRANSMITTER ABSTRACT OF THE DISCLOSURE An electronic security system having sending units for transmitting signals representative of a condition, such as fire, smoke, intrusion, or an emergency, to a central alarm station. The sending units include detectors for producing the condition signals and an electric oscillator circuit for producing an r-f signal in an antenna. A feedback subcircuit of the oscillator circuit includes a surface acoustic wave resonator (SAWR) for stabilizing the oscillations. A circuit including a voltage variable capacitor is responsive to the condition signal to frequency modulate (FM) the r-f signal. The central station receives the modulated r-f signal and decodes it to produce an output indicative of the condition in the protected area. Preferably, the condition signal is a Manchester coded digital signal and the modulation is frequency shift keyed (FSK).

509063

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