Voltage controlled subcarrier phase shifter

Details Voltage controlled subcarrier phase shifter Voltage controlled subcarrier phase shifter

H - Electricity

03

H

328/28, 333/30

H03H 11/16 (2006.01) H03H 11/20 (2006.01)

Patent

CA 1169497

ABSTRACT OF THE DISCLOSURE The phase of an output subcarrier signal may be varied over a range of 360° 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° is provided by varying the threshold of the differential comparator. -2-

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