Roger Sparks wrote:
Is this the idea you were trying to communicate Cecil?
What I am trying to communicate is that the distributed
network model is closer to Maxwell's equations that is
the lumped circuit model. If the lumped circuit model
disagrees with the distributed network model, then it
is wrong.
Steady-state conditions are identical whether the
ideal transmission line is zero wavelength or one
wavelength. If adding one wavelength of ideal
transmission between the source voltage and the
source resistance changes steady-state conditions
in Keith's mind, then there is something wrong in
Keith's mind.
To me, this is destructive interference at work, so all the
power in the reflected wave does not simply disappear into the
resistor Rs on the instant basis.
90 degrees later, an exactly equal magnitude of
constructive interference exists so it is obvious
that the constructive interference energy has been
delayed by 90 degrees from the destructive interference
energy.
One advantage of moving the source voltage one wavelength
away from the source resistor is that it is impossible for
the source to respond instantaneously to the requirements
of the source resistor thus making the energy flow easier
to track. (I'll be glad when I get my sight back so I can
read my calculator.)
--
73, Cecil
http://www.w5dxp.com