Method and apparatus at one-way or two-way information link to e

Details Method and apparatus at one-way or two-way information link to e Method and apparatus at one-way or two-way information link to e

1978-04-18

1981-10-13

Ng, Jin F.

Pulse or digital communications

Repeaters

Testing

375 99, H03K 508, H03K 706

Patent

active

042952212

ABSTRACT:
A radio communication method and apparatus for transmitting a modulated radio frequency signal from a first station to a second station wherein an information-bearing pulse train for modulating the radio frequency signal is chopped at a constant pre-selected rate, wherein a receiver at the second station receives the modulated radio frequency signal and has a detector for detecting the received radio frequency signal to provide an intelligence signal component containing the information and having a frequency corresponding to the pre-selected chopping rate, a bandpass filter tuned to the pre-selected chopping frequency for passing the above mentioned intelligence signal component while rejecting other signal components of different frequencies, circuitry for processing the intelligence signal component passed by the bandpass filter, and a circuit connected intermediate the detector and the bandpass filter for passing to the bandpass filter just those pulse signal components having a pulse width corresponding to the width of pulses in the chopped-up pulse train and a maximum amplitude exceeding a pre-selected threshold level.

REFERENCES:
patent: 2381847 (1945-08-01), Ullrich
patent: 2425066 (1947-08-01), Labin
patent: 3261919 (1966-07-01), Aaron
patent: 3261920 (1966-07-01), Aaron
patent: 4027276 (1977-05-01), Shaughnessy
patent: 4032848 (1977-06-01), Shaughnessy
patent: 4095211 (1978-06-01), Shaughnessy

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