Apparatus for controlling the receive and transmit frequency of

Details Apparatus for controlling the receive and transmit frequency of Apparatus for controlling the receive and transmit frequency of

1982-07-19

1984-12-18

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 32, 455 86, H04B 150

Patent

active

044894139

ABSTRACT:
Apparatus for maintaining a transmit radio signal frequency in a predetermined frequency relationship with a received radio signal. A common voltage controlled frequency source serves as an Lo signal generator for both the receiver and transmitter. A reference frequency oscillator is phase compared with a receive IF signal to derive a control voltage for the voltage controlled frequency source. The resulting phase lock loop provides transmit signal frequency control with respect to a received signal.

REFERENCES:
patent: 3230453 (1966-01-01), Boor et al.
patent: 3611139 (1971-10-01), George
patent: 3683279 (1972-08-01), Weinberg et al.
patent: 4063173 (1977-12-01), Nelson et al.
patent: 4117405 (1978-09-01), Martinez
patent: 4186344 (1980-01-01), Higuchi et al.
patent: 4325140 (1982-04-01), Stitzer
patent: 4353127 (1982-10-01), Richardson
patent: 4411018 (1983-10-01), Amoroso, Jr.

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