Jim Kelley wrote:
Come on, Cecil. You propose a scenario with a change in characteristic
impedance, and then try to pretend there isn't any matter involved?

If you are admitting that a change in Z0 at an impedance
discontinuity involves matter, then we are in agreement.
Sounded to me like you were saying there's no matter
involved at a transmission line impedance discontinuity.

My energy article covers this subject. I state in that article
that there are no reflections except at *physical* impedance
discontinuities so you already know what I said previously.
--
73, Cecil http://www.w5dxp.com