Cecil, W5DXP wrote:
"Concerning open-circuited or short-circuited transmission lines, if the
voltages add up to zero, that looks like a short, and current is at a
maximum. If these conditions occur at the source, 100% re-reflection of
the incident reflected wave energy is guaranteed. The Bird reads equal
forward and reflected power all up and down the feedline."

Yes. A bird is indicatihg power in one direction only and this is the
same along a low-loss line everywhere along the line regardless of SWR.

A short does not kill line energy. It merely transfers electric field
energy into the magnetic field for an instant producing an SWR in which
voltage and current patterns are 90-degrees apart.

When the load end of a transmission line is shorted, 100% of the
incident wave is reflected but the reflected wave has a complete
reversal in phase of its voltage with no change in the phase of its
associated current.

When the load end of a transmission line is open-circuited, 100% of the
incident wave is reflected but the reflected wave has a complete
reversal in the phase of its current with no change in the phase of its
associated voltage.

When the source end of a transmission line is effectively a short or
open circuit, ir re-reflects the reflected wave.

Best regards, Richard Harrison, KB5WZI