Wireless burglar alarm system

Details Wireless burglar alarm system Wireless burglar alarm system

1969-06-26

1976-07-13

Trafton, David L.

Communications: electrical

Systems

Call station

325 57, 340276, 343228, G08B 522

Patent

active

039697096

ABSTRACT:
A radio intrusion alarm system utilizing a high frequency carrier signal having an audio subcarrier which may be modulated by two tone signals, the first tone signal causing actuation of an alarm, the second tone signal causing actuation of a time delay means which inhibits operation of the alarm to permit an authorized entry, for example, at the transmitter location without giving the alarm.

REFERENCES:
patent: 2617923 (1952-11-01), Rekart
patent: 3051934 (1962-08-01), Lesher
patent: 3207850 (1965-09-01), Foreman
patent: 3485953 (1969-12-01), Norberg

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