Telegraphy – Systems – Printing
Patent
1976-02-19
1977-04-19
Griffin, Robert L.
Telegraphy
Systems
Printing
178 691, 325 17, 325 58, 325 63, 343 75, H04B 714
Patent
active
040191389
ABSTRACT:
A frequency synchronizing system for satellite communication, in which a reference frequency coming from a communications satellite is received by a receiving circuit. A first frequency variable oscillator is provided for generating a transmission signal. A second receiving circuit is provided for receiving through the communications satellite the transmission signal which is the output from the first frequency variable oscillator, A first frequency control circuit is provided for controlling the first frequency variable oscillator for making the frequencies of the outputs from the first and second receiving circuits equal to each other. A second frequency variable oscillator is provided for generating a signal of a frequency twice as high as the reference frequency. A frequency converter is provided for mixing the output from the first or second receiving circuit with the output from the second frequency variable oscillator to produce a signal of a difference frequency substantially equal to that of the transmission signal. A phase detector detects the phase difference between the transmission signal and the output from the frequency converter. A frequency control circuit is provided for controlling the second frequency variable oscillator with the output of the phase detector so that the output frequency of the second frequency variable oscillator is twice as high as the frequency of the reference signal on the communications satellite. The first frequency variable oscillator is replaced by a reference oscillator of constant frequency in a reference station.
REFERENCES:
patent: 3430237 (1969-02-01), Allen
patent: 3646444 (1972-02-01), Bitzer
patent: 3835253 (1974-09-01), Bond
patent: 3906364 (1975-09-01), Dobson
patent: 3940695 (1976-02-01), Sickles
Saito Hideki
Watanabe Tatsuo
Adams Bruce L.
Burns Robert E.
Griffin Robert L.
Kokusai Denshin Denwa Kabushiki Kaisha
Lobato Emmanuel J.
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