3641464 is referenced by 25 patents and cites 5 patents.

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.

Title
Directional communication signal tap
Application Number
05/004,977
Publication Number
3641464
Application Date
January 22, 1970
Publication Date
February 8, 1972
Inventor
Thomas John E
Crowhurst David B
Assignee
Lindsay Specialty Products
IPC
H03h 07/38
H01p 05/14
H03H 07/48
H03H 07/00
H01F 19/00
H01F 19/08
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