Emergency vehicle radio transmission system

Details Emergency vehicle radio transmission system Emergency vehicle radio transmission system

1987-08-20

1988-08-16

Griffin, Robert L.

Telecommunications

Interference signal transmission

455 99, 340902, H04K 300

Patent

active

047649780

ABSTRACT:
Radio transmission apparatus usable for emergency vehicles transmits a radio frequency signal on both standard AM frequencies and FM broadcast frequencies to alert vehicles in the path of the emergency vehicle that the emergency vehicle is approaching. The frequencies are broadcast over the entire frequency spectrum so that vehicles using their radios will receive the signal, regardless of what particular frequency is being tuned by their receivers. A crystal controlled oscillator using frequency dividers generates carrier frequencies that are precisely on each AM and FM frequency.

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patent: 3660811 (1972-05-01), Vail et al.
patent: 3760349 (1973-09-01), Keister et al.
patent: 3949300 (1976-04-01), Sadler
patent: 4238778 (1980-12-01), Ohsumi
patent: 4394777 (1983-07-01), Wren
patent: 4443790 (1984-04-01), Bishop
patent: 4587522 (1986-05-01), Warren
patent: 4706086 (1987-11-01), Panizza

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