Radio frequency leakage detection system for CATV system

Details Radio frequency leakage detection system for CATV system Radio frequency leakage detection system for CATV system

1996-07-31

2000-01-25

Grant, Chris

Television

Special applications

Manufacturing

348192, 455 31, H04N 716

Patent

active

060183586

ABSTRACT:
A communication circuit comprises sources of program material, carrier frequency signal sources and first modulators for modulating the carrier frequency signal sources with the program material sources. Each of the first modulators has a first input terminal, a second input terminal and a first output terminal. Terminal apparatus for demodulating program material-modulated carrier frequency signals include automatic gain control (AGC) circuits having AGC bandwidths. One of the program material sources is coupled to the first input terminal of a respective first modulator through a second modulator having a third input terminal, a fourth input terminal and a second output terminal. A source of signals having a frequency in the AGC bandwidth is coupled to the third input terminal. The source of program material is coupled to the fourth input terminal. The second output terminal to the first input terminal.

REFERENCES:
patent: 3368031 (1968-02-01), Eisele
patent: 3684823 (1972-08-01), McVoy
patent: 4072899 (1978-02-01), Shimp
patent: 4237486 (1980-12-01), Shimp
patent: 4670789 (1987-06-01), Plume
patent: 5321849 (1994-06-01), Lemson
patent: 5608428 (1997-03-01), Bush
Archer S. Taylor, "Characterization of Cable TV Networks as the Transmission Media for Data", IEEE Journal on Selected Areas in Communications, vol. SAC-3, No. 2, Mar. 1985 pp. 255-265.

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