Transmit-receive circuit changing switch system

Details Transmit-receive circuit changing switch system Transmit-receive circuit changing switch system

1976-05-21

1978-05-02

Claffy, Kathleen H.

179 1VC, 325152, H04Q 704

Patent

active

040876365

ABSTRACT:
In a press-to-talk system of radio telephone communication, the operator's voice signal actuates a switching signal generator to generate a transmit-receive circuit changing signal which connects the circuit of the radio telephone equipment for transmission or for standby. The audio-frequency signal from the output of the receiver of the radio telephone equipment is properly isolated from the input to the switching signal generator.
In this way, the press-to-talk manual switch is successfully eliminated and the operator can use his hands for other works while he is performing the radio telephone communication. This elimination of the press-to-talk manual switch is advantageous for a radio telephone operator when he is driving a car, working at a construction or a quarrying site, or when he is engaged in a fire extinguishing operation.

REFERENCES:
patent: 3189690 (1965-06-01), Millett
patent: 3189691 (1965-06-01), Simpson
patent: 3366880 (1968-01-01), Driver
patent: 3397401 (1968-08-01), Winterbottom
patent: 3897592 (1975-07-01), Walker

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