Wide band AFC system

Details Wide band AFC system Wide band AFC system

1975-03-31

1976-04-20

Libman, George H.

Telegraphy

Systems

Simplex-reversing periodic

325420, H04N 550

Patent

active

039521435

ABSTRACT:
A wide band automatic frequency control (AFC) system is shown wherein the presence or absence of a video signal in the video channel is detected by determining whether synchronizing pulses are present and modifying the error voltage from the AFC amplifier in the absence of detected synchronizing pulses. Additionally, a voltage combining network comprising three series connected resistors for combining a tuning voltage with the error signal from the error amplifier for application to UHF and/or VHF tuners with varactor diodes is shown.

REFERENCES:
patent: 3858000 (1974-12-01), Merriweather et al.
patent: 3867568 (1975-02-01), Merriweather
patent: 3869674 (1975-03-01), Borbely

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