Multi-band voltage variable capacitance tuner having automatic a

Details Multi-band voltage variable capacitance tuner having automatic a Multi-band voltage variable capacitance tuner having automatic a

1979-11-21

1981-04-21

Gensler, Paul L.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

334 3, 334 15, 334 87, 455176, H04B 126, H03J 318, H03J 532

Patent

active

042636744

ABSTRACT:
A tuning apparatus includes a dial plate marked with broadcast frequencies thereon, a guide shaft provided in parallel with the dial plate, a substrate having a resistive layer thereon, the resistive layer having varying resistance values distributed therealong which correspond to the broadcast frequencies on the dial plate, the resistive layer being supplied with a DC voltage at opposite ends thereof, a plurality of markers, each slidably disposed with respect to the dial plate to indicate a predetermined broadcast frequency, and each having a first engaging portion and a first electrically conductive slide element for slidably contacting the resistive layer to detect a predetermined DC voltage in response to the location of the markers, a mounting member slidably disposed on the guide shaft in parallel with the dial plate, and including a display member extending therefrom toward the dial plate to indicate a manually selected broadcast frequency, a second electrically conductive slide element for slidably contacting the resistive layer to detect a predetermined DC voltage in response to the location of the mounting member, and a sleeve member slidably mounted on the guide shaft and including a projecting portion adapted to engage the engaging portions of the markers, and a switching circuit supplied with the DC voltages from the first and second slide elements and selectively supplying one of the DC voltages to a tuning circuit as a tuning control voltage.

REFERENCES:
patent: 3581252 (1971-05-01), Sacher
patent: 3755740 (1973-08-01), Maugans
patent: 4138653 (1979-02-01), Midgley

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