Jim Kelley wrote:
Ummm, I don't know, Cecil......sounds a little fishy to me.

Let's say you had a one inch piece of 50 ohm coax in the
middle of a longer piece of 75 ohm coax. I'll bet the
reflections from one discontinuity would virtually
cancel the reflections from the other discontinuity.
After all, the math should work if the length of the
50 ohm piece is zero, or 1/2WL, or 1WL, or ...

In fact, a one inch piece of 50 ohm coax should cause
the same steady-state interference conditions as a (one
inch plus one wavelength) piece of 50 ohm coax. Don't
you agree?
--
73, Cecil http://www.qsl.net/w5dxp