Coaxial cable shield filter
First Claim
Patent Images
1. A coaxial cable shield filter for use in attenuating "off-air" RF signals that are picked up and conducted by coaxial cable shielding, the filter comprising:
- a housing;
an input connector mounted on the housing, and adapted to be connected with a coaxial cable;
an output connector mounted on the housing, and adapted to be connected with a coaxial cable;
an RF filter means in the housing interior; and
a conductor in the housing interior connecting the RF filter means to the input connector and the output connector, and arranged to connect the RF filter means in series with the shielding of a coaxial cable connected to the input connector and the shielding of a coaxial cable connected to the output connector;
the RF filter means includes a first toroid secured in the housing interior, the first toroid being constructed from ferromagnetic material;
and the RF filter means further includes a second toroid secured in the housing interior, the conductor being wrapped several times through the first and second toroids.
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Abstract
A coaxial cable shield filter for reducing RF signal interference from cable television lines is connected in series between a cable system coaxial cable and a television receiver. Each choke consists of a ferromagnetic toroidal core, with coaxial cable being wound about each toroidal core. The filter device attenuates secondary RF signals carried by the shielding of the coaxial cable that interfere with the primary signals carried by the cable'"'"'s center conductor.
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Citations
8 Claims
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1. A coaxial cable shield filter for use in attenuating "off-air" RF signals that are picked up and conducted by coaxial cable shielding, the filter comprising:
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a housing; an input connector mounted on the housing, and adapted to be connected with a coaxial cable; an output connector mounted on the housing, and adapted to be connected with a coaxial cable; an RF filter means in the housing interior; and a conductor in the housing interior connecting the RF filter means to the input connector and the output connector, and arranged to connect the RF filter means in series with the shielding of a coaxial cable connected to the input connector and the shielding of a coaxial cable connected to the output connector; the RF filter means includes a first toroid secured in the housing interior, the first toroid being constructed from ferromagnetic material; and the RF filter means further includes a second toroid secured in the housing interior, the conductor being wrapped several times through the first and second toroids. - View Dependent Claims (2, 3)
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4. A filter for reducing television picture interference caused by RF signals conducted on a coaxial cable shielding, the filter comprising:
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a first and a second toroid; a coaxial conductor with first and second ends, and having a center conductor and a shielding surrounding the center conductor; said coaxial conductor being wound about said first and second toroids in series, thereby creating first and second chokes connected in series by the shielding of the coaxial conductor; an input means provided at the first end of the coaxial conductor, the input means being adapted to be connected to a coaxial cable by an unskilled layperson; and an output means provided at the second end of the coaxial conductor, the output means being adapted to be connected to a television receiver by an unskilled layperson. - View Dependent Claims (5, 6, 7, 8)
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Specification