Keith Dysart wrote:
On Dec 30, 5:30 pm, Roger wrote:


I don't recall any examples using perfect CURRENT sources. I think a
perfect current source would supply a signal that could respond to
changing impedances correctly. It should solve the dilemma caused by
the rise in voltage which occurs when when a traveling wave doubles
voltage upon encountering an open circuit, or reversing at the source.

What do you think?

A perfect current source has an output impedance of
infinity, just like an open circuit. The reflection
coefficient is 1.

Similar to the reflected voltage for the perfect
voltage source, the reflected current cancels leaving
just the current from the perfect current source.

...Keith

This disagrees with Roy, who assigns a -1 reflection coefficient when
reflecting from a perfect voltage source.

The Norton or Thévenin equivalent circuits seem capable of positive
reflection coefficients. That is all that I am looking for.

Your search suggestion from a different posting '"lattice diagram"
reflection'yields some examples that demonstrate positive reflection
coefficients.

I must have missed something, because I can't understand why there is an
insistence that a negative reflection coefficient must exist at the
source for the 1/2 or 1 wavelength long transmission line fed at one end.

73, Roger, W7WKB