RF choke for cable system
AssigneeNational Electronic Devices, Inc.
InventorPrabhakara Reddy
Life of this patent
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Abstract
An RF choke for minimizing hum modulation in a coaxial cable system that carries broadband signals along with high amperage 60 Hz AC power signals. The choke contains two conductors wound about a rod core. The first conductor includes two groups of clockwise windings each containing three turns. The second conductor wound counterclockwise also contains two groups of winding one of which contains four turns and the other of which contains three turns. The two connectors are separated by a space of about 0.20″ and a 750 ohm resistor is placed in parallel over the second group of winding in the first conductor and a second 510 ohm resistor is placed in parallel over the first group of windings in the second conductor.
Claims14
An RF choke that includes:
- an elongated core;
- a first group of winding and a second group of windings mounted in series upon said core, said first and second groups of windings defining a first conductor containing six turns;
- a first resistor mounted in parallel over the second group of windings;
- a third group of windings and a fourth group of windings mounted in series upon said core, said third and fourth group of windings defining a second conductor containing seven turns;
- a second resistor connected in parallel over the third group of windings;
- said windings in the first conductor being wound in a direction opposite to the windings in the second conductor;
- and
- said first and second conductors being connected in series and being separated by a given distance such that the inductance at RF frequencies is not substantially reduced.
Dependencies are inferred from the claim text.