# US 4,398,283 A · Superhigh-frequency duplex mode telecommunications device

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- Number: US 4,398,283 A
- Document ID: US4398283A
- Status: Granted
- Kind: A
- Application number: 06/197,100
- Filed: 1980-08-21
- Granted: 1983-08-09
- Earliest claimed: 1978-12-29
- Inventors: Bernard Pottier
- Web page: https://patentgrep.com/patent/US4398283A

## CPC

- H04B 1/56: with provision for simultaneous communication in two directions
- H04B: TRANSMISSION

## Abstract

The invention concerns a duplex superhigh-frequency telecommunications device. The quench oscillator at each station delivers a specific frequency signal frequency-modulated by the information to be transmitted, the carrier quench signal being used as a subcarrier of the information. Application to microwave telephone telecommunications.

## Claims

### Claim 1

In a superhigh frequency duplex mode telecommunications device for communication between a first station and others in a network of stations, each of said stations in said network having a superhigh frequency oscillator providing a carrier frequency to an antenna, and a quench oscillator providing a quench signal, said quench oscillator at each of said stations providing a specific frequency signal acting as a subcarrier signal, said carrier signal being frequency modulated by the information it is desired to transmit, and in which each of said stations further includes a selective filter tuned to the frequency of said quench signal utilized in the station from which it is desired to receive a signal and a frequency modulation detector for detecting said signal, said stations operating in superregeneration, using the same antenna for transmission and reception, said device comprises:
preselector means coupled to said oscillator for tuning said quench oscillator to the frequency assigned to a specific station in said network with which said first station desires to communicate;
means coupled to said preselector means for mixing;
adjustable frequency heterodyne oscillator coupled to said mixer, said heterodyne oscillator being adjusted to provide a constant heat frequency resulting from the mixing of said heterodyne oscillator's output frequency and said quench frequency of said other station in said network whose signal it is desired to receive;
wherein said first station quench oscillator is tunable to frequencies corresponding to said other stations in said network; and
mechanical switch means coupled to said quench oscillator, said preselector and said heterodyne oscillator, for the simultaneous frequency adjustment thereof.

### Claim 2 (depends on 1)

Device according to claim 1 characterized in that, for the restoration of conventional telephone signals, it comprises a voltage-controlled quench oscillator tuned, during the watching state, to a frequency close to the quench frequency, and a phase-lock loop demodulator connected to a circuit which detects its phase lock state so that, when one station passes into the traffic state, its quench oscillator adjusts to its quench frequency and that the demodulator of the other station is thus locked in phase, the circuit which detects its phase lock state thus delivering a conventional signal.

### Claim 3 (depends on 1, 2)

Device according to one of claims 1 or 2, characterized in that, for simultaneous communications between one station and several others, the said station comprises a number of series-connected preselectors, each connected to a circuit comprising a mixer, a heterodyne oscillator, a selective filter, and a demodulator.

### Claim 4 (depends on 1, 2)

The device according to claim 1 or 2 wherein each station includes a selective demodulation circuit.

### Claim 5 (depends on 3)

The device according to claim 3 wherein each station includes a selective demodulation circuit.