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System and method to locate common path distortion on cable systems

  • US 20080319689A1
  • Filed: 07/07/2008
  • Published: 12/25/2008
  • Est. Priority Date: 05/20/2003
  • Status: Active Grant
First Claim
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1. A system to range a distance to a source of CPD on a two-way cable system comprising:

  • a fixed CW signal injected into a downstream signal path;

    a swept signal transmitted from a network analyzer;

    a mixer for generating an up-converted swept signal; and

    a source of CPD in the two-way cable system that mixes the fixed CW signal and the up-converted swept signal to create an upstream swept signal;

    wherein the network analyzer receives the upstream swept signal and determines a complex frequency response created by the source of CPD, an impulse response is determined from the complex frequency response, and the distance to the source of CPD is determined from the impulse response.

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