Satellite transponder able to use same frequency scheme for tran

Details Satellite transponder able to use same frequency scheme for tran Satellite transponder able to use same frequency scheme for tran

1990-09-14

1992-11-10

Eisenzopf, Reinhard J.

Telecommunications

Transmitter and receiver at same station

With frequency stabilization

455 132, 455 87, 455208, 455260, 455265, H04B 140, H04B 7185

Patent

active

051631601

ABSTRACT:
A satellite transponder has the local oscillator in the receiver slaved to a quartz crystal oscillator by a narrowband phase-locked loop during a standby period or in the absence of received signal and by a wideband phase-locked loop immediately the signal is received, at which time the narrowband phase-locked loop is switched out automatically.

REFERENCES:
patent: 4365349 (1982-12-01), Ogita et al.
patent: 4513447 (1985-04-01), Carson
patent: 4879757 (1989-11-01), Loughlin
patent: 4955075 (1990-09-01), Anderson
patent: 5029237 (1991-07-01), Ragan

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