On Jan 22, 6:00*pm, Billy Burpelson wrote:
RHF wrote:
On Jan 22, 4:56 am, Billy Burpelson wrote:
wrote:
I think it is more like a long train (2 seconds long) on a short U
shaped track (1.25 seconds on each leg). *The engine coming back will
pass the caboose still on its way to the end of the U. *
An interesting and thoughtful response. However, it generates a question:

In your train analogy above, what is to keep the leading part of the
echo from being QRMed by the trailing part of the transmitted signal?

BP,

"*" In the 5 Second Time Cycle for the Two Signals; this is
the Two Periods of 'Silence' between the Earth Pulse and
the Lunar Reflection.

EP .= = = = * _ _ _ _ * 5s
LR ._ _ _ _ * -- -- -- -- * 5s

"." Start of the Time Sync for 5 Second Signal Cycle
"=" Earth Pluse Time
"_" Non-Signal Time
"--" Lunar Reflection Time

A 2 Second Earth Pulse with a 2.5 Second Lunar Reflection
Delay creates a One-Half (1/2) Second Period of Silence
between the two Signals.

~ RHF
*.

- Roy, I think you might still might be missing the point here.
- Yes, the ROUND-TRIP delay is 2.5 seconds;
- one-way is ~1.25 seconds.
-
- So, if you send a 2 second long pulse -to- the moon, it will
- arrive in 1.25 seconds and thus the reflected signal will start
- back at time 1.25 seconds; but there is still the remaining
- .75 second of the original terrestrial pulse still winging its way
- to the moon.
-
- Thus my original question: Will the beginning of the echo
- (at time 1.25 sec) QRM the last .75 second of the original
- transmitted pulse still on the way?
-
- Inquiring minds want to know...

IMHO - To the Radio receiving the Two Separate Signals
the Answer would be a : "NO" ~ RHF

The receiving Radio is Earth 'based' -and- The Two Signals
come by 'different' Paths to it :

1 - First comes the 2-Second Earth Pulse*
* The Earth Pulse has a 'Short Path' via Inner Atmosphere SkyWave.
- - - followed by a 1/2 Second of Silence.

2 - Second comes the 2-Second Lunar Reflection**
**The Lunar Reflection has a 'Long Path via the Trans-Atmosphere
Earth-to-Moon-to-Earth (EME) One-Big-Bounce.
- - - followed by a 1/2 Second of Silence.

NOTE - The Two Signal 'arrive' at the Antenna of the receiving
Radio at "Separate" Times in a recuring 5-Second Cycle.