Pulse or digital communications – Repeaters – Testing
Patent
1984-12-03
1986-08-12
Griffin, Robert L.
Pulse or digital communications
Repeaters
Testing
375 3, 34087018, 179170J, H04B 336
Patent
active
046060499
ABSTRACT:
A remote transmitter system including a control station and a remote trantter station. The control station includes a variable frequency oscillator, a modulator, a parallel to series digital data converter and a DC power supply. The remote transmitter station comprises a power storage circuit, a phase-locked-loop demodulator, a local oscillator, a modulator and a power amplifier. The variable frequency oscillator provides two signals f.sub.o and f.sub.1 that are harmonics of each other and are in-phase. These signals modulate the 0's and 1's of digital data that is transmitted along a coaxial cable to the phase-locked-loop demodulator that provides a control signal to the local oscillator and the modulated digital data signal (f.sub.o, f.sub.1) to the modulator. The local oscillator generates two signals f.sub.A and f.sub.B, that have a predetermined phase and/or frequency relationship to f.sub.o and f.sub.1. The f.sub.o and f.sub.1 signals are detected and applied to the modulator as a control signal (D.sub.o, D.sub.1) that generates a serial input signal (f.sub.A, f.sub.B) to the power amplifier and represents the binary data. The invention may be used with either phase modulation, or frequency modulation depending upon the design of the local oscillator. The two outputs f.sub.A and f.sub.B of the modulator can be designed to have any relationship of frequency for frequency modulation or phase for phase modulation.
REFERENCES:
patent: 3201691 (1965-08-01), Lyon
patent: 3310740 (1967-03-01), Leysieffer
patent: 3657478 (1972-04-01), Andrews, Jr.
patent: 3665103 (1972-05-01), Watkins
patent: 3772596 (1973-11-01), Edwards
patent: 4219891 (1980-08-01), Weiss et al.
Beers R. F.
Chin Stephen
Curry C. D. B.
Griffin Robert L.
The United States of America as represented by the Secretary of
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