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Cable Impedance and Structural Return Loss Measurement Methodologies

Two critical electrical specifications for CATV cable are well known: cable impedance and structural return loss. However, as common as these specifications are, the specifications associated with any cable depend upon both the specification definitions and the measurement methodology.

This paper introduces exact definitions for cable impedance and structural return loss along with several measurement methodologies. Several enhancements to traditional measurement methods are introduced which compensate for the largest source of errors. The uncertainties associated with each method are discussed.