Broadcast band siren alarm transmitter system for vehicles

Details Broadcast band siren alarm transmitter system for vehicles Broadcast band siren alarm transmitter system for vehicles

1979-05-29

1984-04-17

Crosland, Donnie Lee

Communications: electrical

Condition responsive indicating system

With particular coupling link

340902, 455 1, 455 29, G08B 108, G08G 100

Patent

active

044437900

ABSTRACT:
A siren alarm on an emergency vehicle or a like warning vehicle, for transmission forwardly over a limited range along the vehicle path, of a broadcast band carrier wave modulated with a siren signal with break-in possible for voice modulation of the carrier, with the carrier frequency rapidly and continuously repeatedly swept over the broadcast frequency band, both in the AM broadcast band and FM broadcast band, thereby to produce in other vehicles, having standard broadcast radio receivers in operation, a warning signal or voice communication; optionally with warning vehicle speed responsive control of the transmitter output power for establishing a transmission range proportional to the warning vehicle speed.

REFERENCES:
patent: 2448055 (1948-08-01), Silver et al.
patent: 2994765 (1961-08-01), Adam
patent: 3046472 (1962-07-01), Manahan
patent: 3624507 (1971-11-01), Fukata
patent: 3660811 (1972-05-01), Vail et al.
patent: 3784970 (1974-01-01), Simpkin
patent: 3949300 (1976-04-01), Sadler

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