Tuning system for a color television receiver having a varactor

Details Tuning system for a color television receiver having a varactor Tuning system for a color television receiver having a varactor

1980-10-01

1982-04-20

Britton, Howard

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

334 16, 3581911, 3581951, 455182, H04B 116, H04B 126, H04N 550

Patent

active

043262961

ABSTRACT:
An improved tuning system for a color television receiver embodying a varactor tuner having a controller functioning as a potentiometer to provide a preselected tuning voltage for channel selection. The system includes a tuning voltage supply having a low impedance drive which is serially connected at its output with the controller. The voltage supply applies a preselected source voltage to the controller which is substantially independent of changes in the resistive value of the controller. The tuning voltage supply is combined with automatic fine tuning correction circuitry connected between the automatic fine tuning system and the varactor tuner. The automatic fine tuning correction circuitry applies a correction voltage to the varactor tuner for temperature compensation, fine tuning errors of 500 KHZ or less, etc.

REFERENCES:
patent: 3965427 (1976-06-01), Ma
patent: 4081771 (1978-03-01), Hendrickson
patent: 4122493 (1978-10-01), Arumugham
patent: 4125863 (1978-11-01), Arumugham
patent: 4234962 (1980-11-01), Hoeft
patent: 4262307 (1981-04-01), Brun
patent: 4262364 (1981-04-01), Fujita
patent: 4263675 (1981-04-01), Hongu

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