US3641464A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Directional communication signal tap
Assignee: Lindsay Specialty Products Ltd
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Filing: 1970-01-22
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Granted: 1972-02-08
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Expires: 1990-01-22
Abstract
Abstract This invention relates to a directive tap for tapping off a portion of a signal strength such as a television signal from a main cable transmission line. The tap of the invention has an improved directivity over a substantial bandwidth which is achieved by providing an electrostatic shield between the input and output levels of the tap on a tap circuit that has a directivity of at least 15 decibels over a range of at least 150 megahertz. The improved directivity is preferably achieved by constructional features of the current and voltage sensing transformers of the unit which includes a winding hole in the core of at least one-hundred-twenty-five thousandths of an inch to provide extra spacing for the windings and the use of a single turn winding on each core that is tightly pulled through the core to accurately and predictably locate the winding with respect to the core.
Inventors
- 👤 David B Crowhurst
- 👤 John E Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:43
CPC Classifications
H; H01; H01F; H01F19/00; H01F19/04; H01F19/08; H03; H03H; H03H7/00; H03H7/48; H03H7/482
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
232 words
A directional signal tap comprising a high-signal level side connecting a main line input with a main line output; a low-level signal side including multiple tap outputs and splitter circuitry connected therewith; directional coupler means connecting the high- and the low-level sides and including a main line voltage sensing transformer having a primary winding and a secondary winding and including a main line current sensing transformer having a primary winding and a secondary winding, wherein said secondary winding of said voltage sensing transformer and said secondary winding of said current sensing transformer are connected to said tap output with polarities to cause voltages on each of said secondary windings to be additive for signals entering at said main line input and to be subtractive for signals entering said main line output, said primary winding and secondary winding of said voltage sensing transformer and said primary winding and said secondary winding of said current sensing transformer being related to achieve substantially equal voltages on the secondaries of each of said transformers in use, the inherent directivity of said coupler means being at least 15 decibels over a signal transmitting band width of at least 150 megahertz and said circuitry being mounted on a panel of a printed circuit type; and electrostatic shielding means between the high-level signal side of the directional signal tap and the low-level signal side of the directional signal tap.
Claim 2
Dependent Claim
232 words
A directional signal tap comprising a high-signal level side connecting a main line input with a main line output; a low-level signal side including multiple tap outputs and splitter circuitry connected therewith; directional coupler means connecting the high- and the low-level sides and including a main line voltage sensing transformer having a primary winding and a secondary winding and including a main line current sensing transformer having a primary winding and a secondary winding, wherein said secondary winding of said voltage sensing transformer and said secondary winding of said current sensing transformer are connected to said tap output with polarities to cause voltages on each of said secondary windings to be additive for signals entering at said main line input and to be subtractive for signals entering said main line output, said primary winding and secondary winding of said voltage sensing transformer and said primary winding and said secondary winding of said current sensing transformer being related to achieve substantially equal voltages on the secondaries of each of said transformers in use, the inherent directivity of said coupler means being at least 15 decibels over a signal transmitting band width of at least 150 megahertz and said circuitry being mounted on a panel of a printed circuit type; and electrostatic shielding means between the high-level signal side of the directional signal tap and the low-level signal side of the directional signal tap.
Claim 3
Dependent Claim
334 words
In a directional signal tap of the type having a main line input, a main line output, a tap output, a main line voltage sensing transformer having a primary winding and a secondary winding, a main line current sensing transformer having a primary winding and a secondary winding, wherein said secondary winding of said voltage sensing transformer and said secondary winding of said current sensing transformer are conNected to said tap output with polarities to cause voltages on each of said secondary windings to be additive for signals entering at said main line input and to be subtractive for signals entering at said main line output, said primary winding and secondary winding of said voltage sensing transformer and said primary winding and said secondary winding of said current sensing transformer being related to achieve substantially equal voltages on the secondaries of each of said transformers in use, the component parts of the circuit of said signal tap being mounted on a panel of a printed-type circuit, the improvement of forming the core of said voltage sensing transformer and the core of said current sensing transformer with a through hole having a diameter of at least one hundred twenty-five one-thousandths of an inch, winding the primary and secondary windings of said voltage sensing transformer and said current sensing transformer about their respective cords through their respective through holes, the secondary winding of said voltage sensing transformer and the primary winding of said current sensing transformer each being a single wire through said through hole at their respective cores and each having their free ends connected to the panel of the printed circuit, said single wires being taut whereby to assume a limiting position in their respective through holes and to locate them in a limiting position with respect to their respective cores and to the other windings of the core and an electrostatic shield between the high-level signal side of said directional signal tap and the lower level signal side of said directional signal tap.
Claim 4
Dependent Claim
334 words
In a directional signal tap of the type having a main line input, a main line output, a tap output, a main line voltage sensing transformer having a primary winding and a secondary winding, a main line current sensing transformer having a primary winding and a secondary winding, wherein said secondary winding of said voltage sensing transformer and said secondary winding of said current sensing transformer are conNected to said tap output with polarities to cause voltages on each of said secondary windings to be additive for signals entering at said main line input and to be subtractive for signals entering at said main line output, said primary winding and secondary winding of said voltage sensing transformer and said primary winding and said secondary winding of said current sensing transformer being related to achieve substantially equal voltages on the secondaries of each of said transformers in use, the component parts of the circuit of said signal tap being mounted on a panel of a printed-type circuit, the improvement of forming the core of said voltage sensing transformer and the core of said current sensing transformer with a through hole having a diameter of at least one hundred twenty-five one-thousandths of an inch, winding the primary and secondary windings of said voltage sensing transformer and said current sensing transformer about their respective cords through their respective through holes, the secondary winding of said voltage sensing transformer and the primary winding of said current sensing transformer each being a single wire through said through hole at their respective cores and each having their free ends connected to the panel of the printed circuit, said single wires being taut whereby to assume a limiting position in their respective through holes and to locate them in a limiting position with respect to their respective cores and to the other windings of the core and an electrostatic shield between the high-level signal side of said directional signal tap and the lower level signal side of said directional signal tap.
Claim 5
Dependent Claim
36 words
In a directional signal tap device as claimed in claim 2, wherein the core of said voltage sensing transformer and the cord of said current sensing transformer are formed from a common piece of core material.
Claim 6
Dependent Claim
53 words
A directional signal tap as claimed in claim 2, having electrostatic shielding means between the high-level signal side of the directional signal tap and the low-level signal side of the directional signal tap, said signal tap having a inherent directivity of at least 15 decibels over a range of at least 150 megahertz.
Claim 7
Dependent Claim
53 words
A directional signal tap as claimed in claim 3, having electrostatic shielding means between the high-level signal side of the directional signal tap and the low-level signal side of the directional signal tap, said signal tap having an inherent directivity of at least 15 decibels over a range of at least 150 megahertz.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-02-07 | 1975-08-09 | 1976-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-07 | 1979-08-09 | 1980-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-07 | 1983-08-09 | 1984-02-08 | $7700.00 | Window Closed / Lapsed |