Data transmission system

Details Data transmission system Data transmission system

1986-06-03

1988-08-02

Weldon, Ulysses

Communications: electrical

Continuously variable indicating

With meter reading

34082534, 307 10AT, H04Q 100

Patent

active

047616440

ABSTRACT:
A control over data transmission and reception which is utilized in remotely controlled electronic vehicle lock system. During the standby mode, the power dissipation in a receiver is reduced to a required minimum level, while when a radio wave is received, the supply of power is automatically switched to enable the receiver for its proper functioning. A transmitter delivers a carrier for a given time interval in response to a switch being turned on, and then transmits a modulated wave which includes a switch code and an identification code. By utilizing a frequency modulation, the presence or absence of a wave being received is determined in accordance with noise level which appears at the demolulator output. When the presence of a wave being received is determined, the supply of power is switched, and is then maintained for a given time interval.

REFERENCES:
patent: 3703714 (1972-11-01), Andrews
patent: 3806939 (1974-04-01), Palmieri
patent: 4107613 (1978-08-01), Queen et al.
patent: 4143368 (1979-03-01), Route et al.
patent: 4413261 (1983-11-01), Greenberg

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