Telamon wrote:

Do you understand the direct and moon reflected signals do not exist at
the same time anywhere on the earth?

Do -you- understand what I wrote? Do you grasp the concept? Please pay
attention.

I -never- said the direct and reflected signals would exist at the
-same- time 'anywhere on earth'.

What I -did- speculate on is that a *portion* of the echo (the echo's
leading edge) will be QRM'd *right as it leaves the moon* (the first
0.75 seconds of the echo) by the trailing edge of the incident wave (its
last 0.75 seconds). Therefore, either a shortened echo (due to full
cancellation of the 'overlap', which is unlikely) or an echo with a
distorted or weakened leading edge (more likely) will ultimately reach
the earth, depending on how much out-of-phase cancellation at the moon
end of the circuit occured.