UHF electronic tuner

Details UHF electronic tuner UHF electronic tuner

1977-05-25

1979-03-20

Griffin, Robert L.

Tuners

Tuner unit with electromagnetic operator

Predetermined center frequency selector

325462, 334 15, 334 45, H04B 126

Patent

active

041456599

ABSTRACT:
A high input selectivity UHF varactor tuner for a television receiver in which unamplified radio frequency signals are inductively coupled to a double tuned half-wave preselector comprising two aperture coupled half-wave tuned lines in separate resonant cavities. The double tuned preselector includes varactor diodes on one end of each tuned line and fixed capacitors on the other end of each line. To compensate for decreasing Q of the varactor diodes with decreasing frequency and thereby maintain a uniform bandwidth for the tuner over the entire UHF spectrum, inductive coupling is provided between the tuned lines at the fixed capacitor ends which, during low frequency operation of the tuner, augments aperture coupling between the lines.

REFERENCES:
patent: 2964626 (1960-12-01), Webster et al.
patent: 3391347 (1968-07-01), Bosse et al.
patent: 3508177 (1970-04-01), Suzuki
patent: 3573683 (1971-04-01), Marshall et al.
patent: 3649937 (1972-03-01), Carlson
patent: 3651409 (1972-03-01), George et al.
patent: 3727140 (1973-04-01), Nieto et al.

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