Simplified frequency scheme for coherent transponders

Details Simplified frequency scheme for coherent transponders Simplified frequency scheme for coherent transponders

1982-12-13

1985-04-23

Ng, Jin F.

Telecommunications

Transmitter and receiver at same station

With frequency stabilization

455 86, 455 12, 343 68R, 343 7PL, H04B 140, H04B 159

Patent

active

045134472

ABSTRACT:
A coherent transponder having a transmitter and a receiver operating at different frequencies with each including a numerically controlled oscillator for controlling the frequency thereof through a single-sideband modulator and various outputs from a phase-locked loop the frequencies of the numerically controlled oscillators and the phase-locked loop being referenced to a single crystal controlled oscillator.

REFERENCES:
patent: 3594790 (1971-07-01), Laughlin et al.
patent: 3683279 (1972-08-01), Weinberg et al.
patent: 4063173 (1977-12-01), Nelson et al.
patent: 4183022 (1980-01-01), Baudard et al.

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