Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1980-06-04
1981-12-22
Ng, Jin F.
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
455180, 335 15, H04B 116
Patent
active
043074677
ABSTRACT:
A varactor controlled tuning system for a television receiver includes first, second and third separated resistive sections formed on a dielectric substrate, a movable contact and means for moving the movable contact along the resistive sections. First and second voltages corresponding to the magnitude of a tuning voltage for the lowest and highest frequency channels in a low VHF band are coupled to the beginning and end points, respectively, of the first section. Third and fourth voltages corresponding to the magnitudes of the tuning voltage for the lowest and highest frequency channels in a high VHF band are coupled to the beginning and end points, respectively, of the second section. Fifth and sixth voltages corresponding to the magnitudes of the tuning voltage for the lowest and highest frequency channel in a UHF band are coupled to beginning and end points, respectively, of the third section. The tuning voltage for the tuner is developed at the movable contact.
REFERENCES:
patent: 3715495 (1973-02-01), Takezaki et al.
patent: 3965427 (1976-06-01), Ma
patent: 4081771 (1978-03-01), Hendrickson
Emanuel Peter M.
Ng Jin F.
Rasmussen Paul J.
RCA Corporation
Whitacre Eugene M.
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