Communications system for automotive vehicles

Details Communications system for automotive vehicles Communications system for automotive vehicles

1981-06-08

1983-10-04

Groody, James J.

Communications: electrical

Selective

Having indication or alarm

340 23, 455 33, 455 52, 455 54, 455 99, G08G 100, G08G 112, G08C 2100

Patent

active

044081790

ABSTRACT:
A communication system for automotive vehicles includes a fixed unit for transmitting an area signal at all times and information signals when requested and a mobile unit mounted on an automotive vehicle for receiving the area signal when the automotive vehicle passes through a communications area and for then transmitting a request signal to receive the information signals from the fixed unit. Since the electric field strength transmitted from the fixed unit is predetermined to be higher than that transmitted from a mobile unit in the case where two threshold levels for electric field strengths transmitted from both the units are equal to each other, it is possible to maintain a stable communications between both the units, even if electric field strength received by the mobile unit drops for some or other.

REFERENCES:
patent: 1721574 (1929-07-01), Potter
patent: 2745953 (1956-05-01), Young
patent: 3662267 (1972-05-01), Reed

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