There's another really good explanation of transmission line theory over here: https://www.ibiblio.org/kuphaldt/electricCircuits/AC/AC_14.html https://www.ibib

There's another really good explanation of transmission line theory over here: https://www.ibiblio.org/kuphaldt/electricCircuits/AC/AC_14.html https://www.ibiblio.org/kuphaldt/electricCircuits/AC/AC_14.h... This is the one that finally made impedance "click" in my head. OP's, however, treats the subject of "loading coils", which I remember hearing about in the context of telephone lines but never really understood until just now.