Rapidly stabilized Gunn oscillator transceiver

Details Rapidly stabilized Gunn oscillator transceiver Rapidly stabilized Gunn oscillator transceiver

1983-10-18

1983-10-18

Ng, Jin F.

Telecommunications

Transmitter and receiver at same station

With frequency stabilization

455 82, 455 24, H04B 140

Patent

active

044110189

ABSTRACT:
A single channel, or push-to-talk transceiver includes a switch-controlled Gunn oscillator for generating the carrier frequency during transmission and a continuously operating local oscillator for demodulation of a received signal in the receive mode. When the push-to-talk switch is depressed, the transmit oscillator is energized and leakage signals cross the circulator to the receiver portion of the transceiver. An RF AFC loop between the transmitter and receiver portions includes a low-pass filter at the preamplifier output which serves as a simple slope discriminator. This output is detected and used to close an electronic servo loop. Once closed, this servo loop locks the transmit oscillator frequency relative to the local oscillator thereby preventing frequency drift during warm-up.

REFERENCES:
patent: 2460781 (1949-02-01), Cantelo
patent: 2924703 (1960-02-01), Sichak et al.
patent: 3829788 (1974-08-01), Amoroso, Jr.
patent: 3916412 (1975-10-01), Amoroso, Jr.
patent: 3925729 (1975-12-01), Amoroso, Jr.
patent: 3931575 (1976-01-01), Amoroso, Jr.
patent: 3935533 (1976-01-01), Amoroso, Jr.
patent: 4186344 (1980-01-01), Higuchi et al.

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