Voltage controlled subcarrier phase shifter

Details Voltage controlled subcarrier phase shifter Voltage controlled subcarrier phase shifter

1980-09-09

1982-11-23

Heyman, John S.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307530, 307354, 307228, 328 55, 328223, H03K 5153, G01R 2504

Patent

active

043607470

ABSTRACT:
The phase of an output subcarrier signal may be varied over a range of 360.degree. with respect to the phase of an input subcarrier signal. A ramp generator which generates a ramp at one-half the subcarrier frequency, is coupled to a very fast differential comparator means whose output causes a subsequent tuned circuit to ring at the subcarrier frequency. Continuous oscillations, recycled every second subcarrier cycle, are generated as determined by the threshold set on the differential comparator means. A crystal filter reproduces the output subcarrier as a clean sinewave. Remotely controlled phase adjustment of from zero to 360.degree. is provided by varying the threshold of the differential comparator.

REFERENCES:
patent: 2912576 (1959-11-01), Bacher
patent: 3166718 (1965-01-01), Zyskowski
patent: 3569842 (1971-03-01), Schroyer
patent: 3601708 (1971-08-01), Stempler

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