Owen Duffy wrote:
I haven't seen "virtual reflection coefficient" used to have that
meaning. Nor have I seen hams commonly, as you suggest, using rho in the
way in which you could use S parameters or Gamma.

I am handicapped by being away from my reference books
but I believe that RF engineers use rho and Gamma
interchangeably along with other symbols like RC.

The difference between a virtual reflection coefficient
and a physical reflection coefficient has nothing to
do with what it is named. No matter what is the value
of the physical reflection coefficient, e.g. s11, the
virtual reflection coefficient at a Z0-match is zero
because the reflected voltage, current, and power is
zero.
--
73, Cecil http://www.w5dxp.com