Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1980-03-20
1981-06-02
Griffin, Robert L.
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
455191, 455188, 334 15, H04B 116
Patent
active
042715296
ABSTRACT:
A conventional varactor tuned VHF/UHF television tuner with additional inductors placed in parallel in each VHF tuned circuit by means of diode switching provides an additional tuning capability over the CATV Superband. Selective tuning to any broadcast channel within the VHF, UHF and CATV bands is achieved by voltage-controlled tunable circuitry such as the type employing varactor diodes responsive to an adjustable DC tuning voltage having unique levels assigned to the various desired channels. By providing an additional bandswitching input voltage to a conventional tuner, Superband coils are diode-switched in parallel with VHF tuned circuits permitting an expanded tuning frequency range. This parallel coil approach in achieving Superband coverage permits the utilization of spring-wound VHF-band and Superband coils to facilitate tuning circuit alignment and to eliminate the need for a discrete Superband tuner or a CATV converter.
REFERENCES:
patent: 3564423 (1971-02-01), Putzer
patent: 3611154 (1971-10-01), Kupfer
patent: 3628152 (1970-02-01), Carlson
patent: 3646450 (1972-02-01), Ma
patent: 3727140 (1973-04-01), Rodrigalvarez
patent: 3903487 (1975-09-01), Maier
patent: 3931578 (1976-01-01), Gittinger
patent: 3942122 (1976-03-01), Nakanishi
patent: 4002986 (1977-01-01), Ma
patent: 4115737 (1978-09-01), Hongu
Chin Tommy P.
Griffin Robert L.
Hill Thomas E.
Zenith Radio Corporation
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