Continuous tuning arrangement for a multiband television receive

Details Continuous tuning arrangement for a multiband television receive Continuous tuning arrangement for a multiband television receive

1978-11-30

1981-02-03

Griffin, Robert L.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455176, 331177R, 334 15, 3581911, H04B 106

Patent

active

042492564

ABSTRACT:
A television tuning system for generating a tuning voltage for a varactor controlled local oscillator includes a continuous resistive element having first, second, third and fourth points along its resistive path which define first, second and third resistive sections corresponding, respectively, to the low VHF, high VHF and UHF tuning bands and a movable contact. A position detecting arrangement determines the position of the movable contact along the path of the resistive element to determine which band is being tuned and in response selectively couples voltages corresponding to the magnitudes of the tuning voltage corresponding to the beginning and end points of the various bands to respective points along the resistive element. As a result, with continuous motion of the movable contact a tuning voltage for each channel in the television range is developed at the movable contact.

REFERENCES:
patent: 3492514 (1970-01-01), Korn
patent: 3526859 (1970-09-01), Putler
patent: 3646450 (1972-02-01), MA
patent: 3715495 (1973-02-01), Takezaki
patent: 3750030 (1973-07-01), Worcester
patent: 3878466 (1975-04-01), Hendrickson
patent: 3906373 (1975-09-01), Hendrickson
patent: 3962643 (1976-06-01), MA
A T.V. Tuning Method with Automatic Band Switching, by Hashima, Transactions on Joint Conference of West Japanese Branches of Electrical and Electronic Engineering on Oct. 20, 1978.

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