On Apr 18, 9:19 pm, Cecil Moore wrote:
Dr. Honeydew wrote:
Cecil Moore wrote:
A Bird wattmeter reads 100 watts forward and 100w reflected. The
current in the source is zero. The source is not only not sourcing any
forward power, it is also not sinking any reflected power.

What complete and utter Texas-size bullsh*t. It's obvious that the
source is sourcing the forward voltage wave, and it's sucking up
entire reverse voltage wave from the line.

And doing it while magically expending zero energy.
Perpetual motion is possible, after all.

If zero power is being dissipated in the source, it cannot
be sourcing the forward voltage wave and it cannot be
sucking up the reverse voltage wave.
--
73, Cecil http://www.w5dxp.com


Ah, I can see you didn't take me seriously. But I was dead serious.
It is absolutely not necessary for the source to be dissipating the
reverse wave it sucks up as heat.

A challenge: given a linear system consisting of a source of
impedance Z1, connected to a line (any length you want; any loss you
want) of impedance Z2, and the far end of the line connected to a load
of impedance Z3, or even to a different source of impedance Z3
(possibly different frequency, phase, and/or amplitude from the first
source). Give us one example, even one, that's not accurately
described by source Z1 launching waves into impedance Z2 in the
"forward" direction, plus whatever "reverse" wave is on the line doing
exactly the expected things at the Z2:Z1 boundary. In other words,
viewed from both sides, show us even one instance where the system is
not correctly analyzed with your S11--S12 equations for the Z1--Z2
interface. Show us even one instance where those equations will not
tell you exactly what happens to waves coming into that interface from
either direction, and in fact from both directions at once.

What the source does with the incoming wave is another matter,
independent of the Z1--Z2 interface. Whether it causes increased or
decreased dissipation of heat in the source depends on how the source
is made, and the characteristics (phase, amplitude, frequency, ...) of
the incoming wave.

From the labs,

Bunsen