Four band VHF varactor tuner

Details Four band VHF varactor tuner Four band VHF varactor tuner

1980-10-27

1982-12-07

Chin, Tommy P.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455188, 455176, H04N 544, H04B 116

Patent

active

043631355

ABSTRACT:
A varactor controlled television receiver tuning system is operable for tuning all VHF and CATV television channels in four frequency bands including the low VHF band extending between 54-88 MHz, the mid/high VHF band extending between 120-216 MHz, the CATV superband extending between 216-300 MHz and a CATV hyperband extending between 300-400 MHz. The tuning system comprises a plurality of identically configured resonant circuits each responsive to a pair of band switching signals for assuming a total inductance for tuning each of the four different frequency bands, each of the resonant circuits being alignable by adjusting a different variable reactance element in each frequency band.

REFERENCES:
patent: 3526859 (1970-09-01), Putzer
patent: 3559075 (1971-06-01), Okazaki
patent: 3611154 (1971-10-01), Kupfer
patent: 3646450 (1972-02-01), Ma
patent: 3942122 (1976-03-01), Nakanishi
patent: 3980957 (1976-09-01), Putzer
patent: 4002986 (1977-01-01), Ma
patent: 4247953 (1981-01-01), Shinagawa
patent: 4271529 (1981-06-01), Strammello, Jr.
patent: 4326295 (1982-04-01), Matsumoto et al.

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