John Popelish wrote:
. . .
That's exactly the difference. But if you measure a single point, you
can't tell whether you are measuring a point on a traveling wave or a
standing wave. Agree?


There seems to be some confusion about just what a standing wave is.

A standing wave is the result of, and the sum of, two or more traveling
waves. There aren't points which are "on" one or the other. If you can
separately measure or calculate the values of the traveling current
waves at any point, you can add them to get the total current (what
Cecil calls "standing wave current") at that point. If you add the
traveling current waves at each point along the line and plot the
amplitude of the sum (that is, of the total current) versus position,
you see a periodic relationship between the amplitude and position. It's
this relationship which is called a "standing wave". It's so called
because its position relative to the line stays fixed. It's simply a
graph of the total current (the sum of the traveling waves) vs. position.

Roy Lewallen, W7EL