Television tuning system with precision substrate switch...

Details Television tuning system with precision substrate switch... Television tuning system with precision substrate switch...

H - Electricity

03

J

365/12

H03J 5/02 (2006.01) H03J 1/06 (2006.01)

Patent

CA 1054271

ABSTRACT OF THE DISCLOSURE 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 encompass- ing 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. - 1 -

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