Keith Dysart wrote:
Did you swap x and y in the second last sentence and really mean
"There are reflections to the left of x but no reflections to
the left of y"?

No, a properly calibrated Bird wattmeter will measure
some reflected power to the left of y but zero
reflected power to the left of x. Hint: Point x achieves
a Z0-match which re-reflects all reflected energy back
toward the load. That is a result of total destructive
interference toward the source and total constructive
interference toward the load, a concept that presently
seems to be beyond your comprehension.
--
73, Cecil http://www.w5dxp.com