On 25/05/2010 18:45, lu6etj wrote:
....
To Owen: Sincerely thanks for your reasons. You can be sure I will
take note about your explanation an take some time tu analize it, but
I am not sure about to arrive at at the right conclusion because what
I read in this newsgroup is a long-standing discussion here.


Yes, it is a recurrent discussion item. No doubt someone will be along
shortly to add some confusion to the pot.

A parting thought, do not confuse the process of establishment of steady
state with steady state. The only reason that a steady state solution is
valid, is that the system spends most of its time in steady state, or
substantially so. If the solution needs to focus mainly on establishment
of steady state (in other words, the system never substantially
settles), then you should be doing a time domain solution, and VSWR,
reactance, complex impedance are not a time domain concepts.

If you need to convince yourself, do a hand workup of five of ten
transits with a sinusoidal excitation. See that is does converge, and
quickly, and that at the load end, the reflected wave relative to the
forward wave is a fixed ratio (and hence VSWR) that depends ONLY on Zo
and Zl, there is NO influence by the source or any perceived source
reflection on the steady state. There are some animations of this on the
net, but they seem to confuse people more than enlighten them.

Owen