Keith Dysart wrote:
If care is taken with the selection of modulation
frequencies with regards to the carrier, then nodes
can be created on the transmission line and neither
the carrier nor the modulation will cross such a
node.

Please prove your assertion on the bench. Until you
do, there is little left to discuss.

Please produce an example of
a real world transmission line that would support your
100% reflection. Hint: what would be the Z02
characteristic impedance in the reflection
coefficient equation, (50-Z02)/(50+Z02) = 1.0 ???

That is just too easy...
(50-Z02)/(50+Z02) = 1.0
50 - Z02 = 50 + Z02
-2 * Z02 = 0
Z02 = 0
That wasn't so hard, was it?

Now build one. Be sure to verify that you can transfer
energy from end to end. Until you do, there is little
left to discuss.
--
73, Cecil http://www.w5dxp.com