Uploaded July 2026 | Updated September 2026, 3 weeks ago

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This video provides a short technical introduction to why cable phase stability is important and how the phase stability of coaxial cables is measured using vector network analyzers.

Suggested video description links:

Test and Measurement Fundamentals Playlist: youtube.com/playlist?list=PLKxVoO5jUTlvsVtDcqrVn0ybqBVlLj2z8

Understanding Semi-Rigid Cables: youtu.be/4beiTANyrco

Vector network analyzers from Rohde & Schwarz:
rohde-schwarz.com/us/products/test-and-measurement/network-analyzers_64043.html

Timeline:
00:00 Introduction
00:18 About ideal coaxial cables
01:03 About phase stability
02:16 Factors affecting phase stability
02:31 About phase stability and temperature
03:45 About the PTFE (or “Teflon”) knee
05:10 About flexion / flexure
06:31 Phase stability and flexion
07:36 Phase stability in test and measurement cables
08:50 Measuring phase stability as a function of temperature
09:34 Example measurement: phase variation vs. temperature
10:10 Measuring phase stability as a function of flexion
11:29 Flexion phase stability test methods
11:47 “Shake stability”
12:33 Reflection stability
13:28 Example measurement: phase variation due to flexion
14:10 Transmission stability
14:57 Summary