Impedance Mismatch Archives |

Scalar Testing (Part ONE)

By H. Mark Bowers – In my last column we examined digital QAM testing requirements under present FCC Part 76 Rules and ANSI/SCTE 40 2003 Requirements. In this column we’ll begin an examination of scalar testing and why it’s important in the HFC network.

Return Loss

By Ron Hranac – The coaxial cable portion of our networks has long been designed and built to have a nominal impedance of 75 ohms. The word “nominal” is used to describe the impedance, because it’s pretty much impossible for the impedance to be exactly 75 ohms, especially across a wide frequency range.