Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1976-04-26
1978-02-07
Griffin, Robert L.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
1791753F, 324 52, 324 725, 324 95, 325308, 358 86, H04B 1700
Patent
active
040728994
ABSTRACT:
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.
REFERENCES:
patent: 3453533 (1969-07-01), Cox
patent: 3469190 (1969-09-01), Rheinfelder
patent: 3551804 (1970-12-01), Weddle
patent: 3651403 (1972-03-01), Fluck, Jr.
patent: 3872470 (1975-03-01), Hoerz et al.
patent: 3882287 (1975-05-01), Simmonds
patent: 3908165 (1975-09-01), Cauldwell
patent: 3991363 (1976-11-01), Lathrop
Bookbinder Marc E.
ComSonics, Inc.
Griffin Robert L.
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