Method and apparatus for remote indication of faults in coaxial cable R-F transmission systems
First Claim
1. A method of remote fault location for a coaxial cable R-F transmission system comprising the steps of:
- (1) inserting a predetermined fault locator signal frequency into said system;
(2) locating a plurality of passive R-F emitting coupler-filter units each tuned to said predetermined fault locator signal frequency at points in said system where it is desired to detect possible system faults, and each radiating said R-F fault locator signal into free space;
(3) traveling to and observing said predetermined fault locator signal frequency which is radiated into free space from each of said coupler-filter locations; and
(4) investigating for a possible fault at each coupler-filter location where a fault locator signal frequency is absent.
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Abstract
A method for locating faults or failures in R-F coaxial cable TV transmission facilities is shown and described. A fault locator signal frequency is inserted into a cable system, and low magnitude signals are emitted by means of a band pass filter and radiating element. The radiated R-F is detected to determine coaxial cable system operation. Band pass filters and radiating elements are located at each point to be tested.
An apparatus for emitting a controlled narrow band of R-F energy which utilizes a band pass filter and a radiating element is also shown and described.
This is the disclosure of intentional, controlled, discriminate R-F radiation used for fault detection and a coupler-band pass filter to accomplish it.
116 Citations
17 Claims
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1. A method of remote fault location for a coaxial cable R-F transmission system comprising the steps of:
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(1) inserting a predetermined fault locator signal frequency into said system; (2) locating a plurality of passive R-F emitting coupler-filter units each tuned to said predetermined fault locator signal frequency at points in said system where it is desired to detect possible system faults, and each radiating said R-F fault locator signal into free space; (3) traveling to and observing said predetermined fault locator signal frequency which is radiated into free space from each of said coupler-filter locations; and (4) investigating for a possible fault at each coupler-filter location where a fault locator signal frequency is absent. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A coupler-filter for transmitting a selected portion of an R-F signal spectrum from witin a coaxial cable transmission system to the free space region beyond said system comprising in combination:
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(a) means for attaching said signal coupler-filter to said coaxial cable transmission system; (b) pick up means for receiving R-F energy signals from said coaxial transmission system; (c) narrow band pass passive R-F filter means for permitting only a preselected band of R-F energy signals to pass through said coupler-filter; and (d) an R-F irradiating means for transmitting said preselected band of R-F energy in free space beyond said coaxial cable system. - View Dependent Claims (14, 15, 16, 17)
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Specification