UHF television tuner with electrical fine tuning

Details UHF television tuner with electrical fine tuning UHF television tuner with electrical fine tuning

1976-05-11

1977-10-18

Gensler, Paul L.

Tuners

Tuner unit directly responsive to voltage and/or current...

Reactance tuning

325456, 325464, 331177V, 334 88, H03J 512

Patent

active

040548538

ABSTRACT:
An electrical fine tuning system for a UHF television tuner utilizes a voltage variable capacitor for adjusting the operating frequency of the oscillator. The capacity of the voltage variable capacitor is determined by a potentiometer that is mounted concentrically with the selector shaft and serves as a fine tuning control. An automatic frequency control voltage may be applied to the voltage variable capacitor used for fine tuning or to a second voltage variable capacitor. Circuitry is provided for extending the tuning range of the voltage variable capacitor when a single voltage variable capacitor is used both for fine tuning and automatic frequency control, and an improved mechanical construction is used to couple the voltage variable capacitors to the oscillator.

REFERENCES:
patent: 3307414 (1967-03-01), Naber et al.
patent: 3678421 (1972-07-01), Ono
patent: 3697904 (1972-10-01), Mohri et al.
patent: 3842683 (1974-10-01), Valdettaro
patent: 3878466 (1975-04-01), Hendrickson

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