"Keith Dysart" wrote in message
...

Sorry i have been absent for a while, been too busy with other work and had
to turn this off to keep from spending all my time laughing at the postings.
Are we going for another 1000 post thread? almost 2/3's of the way there
now... here is a kick to keep it going.

You have claimed that energy can cross a point on
the line where V or I is always 0.

ah, so once you have a standing wave on a line then no energy can cross the
voltage or current nodes?? thats interesting. so at the place where
current is 'always' 0 the voltage is a max right? so what happens to the
V^2/Z power at that point? is that not flowing past that point?
conversely, at the point where voltage is always zero, what happens to the
large I^2*R power at that point??? where does that go? then try this
thought experiment... take a long coax with an open circuit end, feed it
with sinusoidal ac so it has nice standing waves, keep it lossless just
because that irritates some of the writers on here. then attach a pure
resistance equal to Z0 at the open end. now, if energy can't pass the
points where V or I is zero, and I is obviously zero at the open circuit at
the end of the line there should be no power to flow into that resistor???
Oh, but wait, the voltage is a max there so the resistor could draw power
from the voltage standing wave, but then what happens to the current
standing wave? once the resistor drains the last half wave voltage wave how
does energy get from the next standing wave into the far end one to
replenish it if it can't flow across the voltage node?? sorry, i have to
stop, about to start another laughing fit.

all of the above obvious contradictions become intuitively obvious once you
completely forget the standing waves and think only in terms of the
traveling waves. and remember, again just because it tweaks some
correspondents on here, you only need the voltage OR the current traveling
wave, either one is sufficient to completely describe the conditions on the
line in either steady state or transient conditions. (as long as the line
and components are all linear and time invarient, loss is not a problem for
this statement to be true)