Pulse or digital communications – Repeaters – Testing
Patent
1980-05-27
1982-10-19
Safourek, Benedict V.
Pulse or digital communications
Repeaters
Testing
375 97, 455 22, 455316, 331117R, H03B 512, H03D 716
Patent
active
043554040
ABSTRACT:
A carrier recovery network for QPSK modems employs a synchronous oscillator which may be used as a frequency multiplier, divider and tracking bandpass filter. A preferred embodiment of the carrier recovery network includes a multiply-by-four circuit to remove QPSK data modulation, and a synchronous oscillator tuned to one-fourth the input frequency to thereby act as a frequency divider and tracking bandpass filter to provide a recovered carrier signal.
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Communications Satellite Corporation
Safourek Benedict V.
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