"Cecil Moore" wrote in message
...
Sal M. Onella wrote:
What did I say wrong?

You implied that reflected energy is always dissipated
in the transmitter.

How much of the reflected energy is dissipated in the
source depends upon the interference pattern at the
source. As w7el points out, dissipation in a voltage
source can be reduced to zero by the astute choice of
a special best case of complete constructive
interference in the direction of the load.
--
73, Cecil http://www.w5dxp.com

You haven't commented yet pro or con, but if I may, I want to expand on
the observation I made about your variable length twin-lead arrangement
being an "astute choice" to promote complete constructive interference in
the direction of the load.

If the line length will bring this about as you have demonstrated, does
this mean that a tuner appears to adjust the effective line length (from the
perspective of the source)? The only explanation of a tuner I have seen
describes it as creating a stub whose impedance, in parallel with the
impedance of the transmission line/antenna system, is seen as 50 ohms, a
presumptive good match. I don't know enough to accept or reject this
notion, so I shall do neither at the moment. However, I think of a stub as
shunting a transmission line, whereas the tuner is electrically in series,
so maybe something's fishy about that. I withhold judgment.

More to the point, when I was taught transmission lines, they were
diagrammed with lumped constants: series resistance and inductance + shunt
capacitance. The internals of a pi tuner are just more of the same and
would seem (by intuition, alone -- I am not claiming anything) to behave as
an adjustable length line, minus the resistive component. By extension,
Does a T tuner cancel some of the reactance of the line in which it is
inserted, thereby effectively shortening the line. (The phase "conjugate
impedance" is poking out from a fold of my brain.)

Am I onto something or have I simply launched myself into the eye of
another ****storm?

"Sal"