Maintaining frequency accuracy in single sideband repeaters

Details Maintaining frequency accuracy in single sideband repeaters Maintaining frequency accuracy in single sideband repeaters

1983-03-29

1985-03-05

Ng, Jin F.

Telecommunications

Carrier wave repeater or relay system

With frequency conversion

455315, 331 2, 328 14, H04B 714

Patent

active

045035628

ABSTRACT:
A system for maintaining an accurate frequency source in a single sideband repeater employs an ultra stable station control reference (SCR) frequency generator. A first frequency synthesizer for a local oscillator of the repeater phase locks to the output of the SCR normally, but is free running upon failure of the SCR. A second frequency synthesizer for another local oscillator phase locks to the output of the first synthesizer. Upon failure of the SCR, the system of synthesizers can provide a satisfactory frequency reference for the repeater. Disclosed are phase lock loop filter time constant design considerations for achieving proper operation.

REFERENCES:
patent: 3480883 (1969-11-01), Gaunt, Jr.
patent: 4035833 (1977-07-01), Shepard
patent: 4140972 (1979-02-01), Enriquez et al.
patent: 4293825 (1981-10-01), Cerra

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