Roger wrote:
However, I can see the dilemma faced by a purist who sees 2v from a
reflected wave (because the reflected wave has returned to the source
and reflected as if it were an open end) and the 1v from the source at
exactly the same location. Something must be wrong.

It can happen at a Z0-match point where destructive
interference exists on the source side and constructive
interference exists on the load side.

Here's an example:

Source-+---1/2WL 300 ohm line---50 ohm load

Assume the source voltage is 1 volt
The reflected voltage is ~2.5v
The forward voltage is ~3.5v
The load voltage is 1 volt

I don't recall any examples using perfect CURRENT sources.

A Norton equivalent circuit is a perfect current source.
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73, Cecil http://www.w5dxp.com