Abstract A television tuner arrangement is disclosed including a wide band signal selecting circuit having a solid state voltage variable capacitance selectively controllable in accordance with the level of applied voltage and a channel selector control for controlling the voltage levels applied thereto. The control illustrated herein includes a selector, actuatable to a plurality of channel selection settings, a cylindrical shaped structure providing an external surface of conductive material, and a plurality of voltage taps radially disposed about the surface of the cylindrical structure and mounted for individual movement along the conductive material. A tuning voltage bus is connected to the wide band circuit and is selectively connectable to each of the taps. The cylindrically shaped structure and taps are mounted for rotation about the axis of the structure and ganged to the selector so that a separate tap is connected to the bus for each channel selection setting.
Inventors
👤 Edward L Midgley
Bibliographic Details
Application Number—
JurisdictionUS
Data Sourcegoogle_patents
Last Synchronized2026-10-25 21:13
CPC Classifications
H; H03; H03J; H03J1/00; H03J1/06; H03J1/066
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
156 words
A voltage selector for a voltage controlled TV tuner comprising a voltage divider circuit including a drum rotatable about a central axis, a plurality of voltage taps mounted in an annular array encircling and contacting the periphery of the drum to ride with the drum, means for rotatably indexing the drum for selectively connecting each of said taps individually to the tuner and means for adjusting the point of contact of each tap axially relative to the drum, there being one of said adjusting means corresponding to each tap, each said adjusting means being operable only when its corresponding tap is electrically connected to the tuner, said drum having a cylindrical external surface coating of resistive material bordered by conductive cylindrical strips at opposite axial extremities, said circuit including means applying voltages of different levels to said strips to provide an axial voltage gradient across said coating that is uniform about the circumference of said coating.
Claim 2
Dependent Claim
156 words
A voltage selector for a voltage controlled TV tuner comprising a voltage divider circuit including a drum rotatable about a central axis, a plurality of voltage taps mounted in an annular array encircling and contacting the periphery of the drum to ride with the drum, means for rotatably indexing the drum for selectively connecting each of said taps individually to the tuner and means for adjusting the point of contact of each tap axially relative to the drum, there being one of said adjusting means corresponding to each tap, each said adjusting means being operable only when its corresponding tap is electrically connected to the tuner, said drum having a cylindrical external surface coating of resistive material bordered by conductive cylindrical strips at opposite axial extremities, said circuit including means applying voltages of different levels to said strips to provide an axial voltage gradient across said coating that is uniform about the circumference of said coating.