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US 4,072,899 AGranted
RF leak detector
AssigneeComSonics, Inc.
InventorRichard L. Shimp
Life of this patent
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AssigneeComSonics, Inc.
InventorRichard L. Shimp
Estimating the term…
The detector is primarily useful in detecting RF leaks due to defects in the shielding in a CATV coaxial cable distribution network. RF leaks are detected by transmitting a unique signal and using a very narrow band receiver to detect the unique signal to thereby detect small amounts of RF leakage from the CATV coaxial cable distribution network at the locations of defects in the shielding. The leakage from the CATV coaxial cable distribution network is due to defects in the shielding such as small cracks in the cable, loose fittings or other non-RF tight conditions. The detector is a three-part system including a transmitter, a remote cable powered preamp and antenna assembly, and a narrow band receiver providing an audio output. The transmitter is designed to be permanently installed at the head end location and is modulated with a unique audio tone. An RF leak is detected by moving the remote preamp and antenna assembly along the coaxial cable distribution network of the CATV system. When the remote preamp and antenna assembly picks up leakage RF energy, the unique audio tone will be detected, and the detected audio signal fed to a loud speaker or earphones. The audio tone is readily recognized by the operator.
A method of detecting RF leaks due to defects in the shielding of a coaxial RF communications medium comprising the steps of:
A system for detecting RF leaks due to defects in the shielding of a coaxial RF communications medium comprising:
An RF leak detector for CATV systems of the type having a transmitter located at a head end and a coaxial cable distribution network emanating from said head end to a plurality of subscriber's terminals, said detector comprising:
A method of detecting RF leaks due to defects in the shielding of coaxial cables of CATV systems of the type having a transmitter located at a head end and a coaxial cable distribution network emanating from said head end to subscribers' terminals, said method comprising the steps of
In an RF leak detecting system for locating RF leakage due to defects in the shielding of coaxial cables in CATV systems of the type having a transmitter located at a head end and a coaxial cable distribution network emanating from said head end to a plurality of subscribers' terminals, said RF leak detecting system including an antenna adapted to be moved proximate to coaxial cable distribution network for receiving any RF leakage from the coaxial cable, distribution network, and a receiver connected to said antenna, the improvement comprising:
A device for use with a movable antanna for receiving RF leakage due to defects in the shielding of a coaxial RF communications medium and a receiver connected to said movable antanna, said device comprising:
Dependencies are inferred from the claim text.