Common-Mode Current is somewhat mysterious.
To get a grasp on what we are battling, we have to understand what it really is. This is the point of this video as presented to the Great River Amateur Radio Club, Dubuque, IA.
00:05 Introduction
00:20 What has been our experience?
01:24 Terminology
01:56 Balanced/Differential Line?
02:32 What is Common-Mode Current
04:09 How does this work with coax?
05:13 Where does common-mode current flow in our coax?
05:24 Skin Effect
06:17 How many conductors does coax have?
07:23 The Nature of coax and current
09:10 Final Comments and Toodle-oots!