Tuners – Tuner unit with electromagnetic operator – Predetermined center frequency selector
Patent
1974-09-03
1976-06-22
Griffin, Robert L.
Tuners
Tuner unit with electromagnetic operator
Predetermined center frequency selector
325459, 325462, 334 15, H03J 502
Patent
active
039654273
ABSTRACT:
A VHF television tuner system has four tunable circuits each including an abrupt junction varactor diode having a predictable capacitance-tuning voltage characteristic. The VHF frequency spectrum is divided into Lo and Hi bands encompassing television channels 2-6 and 7-13, respectively. A pair of voltage divider networks comprising precisely trimmed resistive material on a ceramic substrate provide tuning voltage terminals corresponding to the VHF television channels. The end terminals of each divider network are coupled to adjustable potentiometers for setting the tuning voltage at each extreme of the voltage divider. A substrate mounted switch accesses the tuning voltage points, supplies bandswitching voltages and provides AFC defeat between channels.
REFERENCES:
patent: 2774934 (1956-12-01), Gitzendanner
patent: 3204207 (1965-08-01), Denker
patent: 3566277 (1971-02-01), Von Fange et al.
patent: 3581252 (1971-05-01), Sacher
patent: 3626352 (1971-12-01), McCoig
patent: 3646450 (1972-02-01), Ma
patent: 3685141 (1972-08-01), Sandera
patent: 3878466 (1975-04-01), Henrickson
Camasto Nicholas A.
Griffin Robert L.
Ng Jin F.
Zenith Radio Corporation
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