On Jan 27, 3:07*pm, Billy Burpelson wrote:
craigm wrote:
Billy Burpelson wrote:

Billy Burpelson wrote:

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.
craigm wrote:

Your error is assuming that echo is modified by the incident wave. The
waves pass by each other without interacting.
You seem to be contradicting yourself here. Above, you say they will
"pass by each other without interacting". Below, you say "anywhere they
'overlap' you *will* see interference". [emphasis added].

When you try to observe the waves, using any method, you get the sum of
the two signals. So anywhere they 'overlap' you will see interference.
This is superposition.
I agree -- *and if you read what I said above (or tried to say) was
addressing the overlap, which due to superposition, will either
constructively or destructively add; in either case, the 'overlap'
portion of the echo (leading edge) -will- be modified *(or degraded or
interfered with, however you want to look at it) by the trailing edge of
the incident signal, and that portion of the echo, when received on
earth, will be perceived as such.

Aren't we really saying the same thing???

No it is not the same. The waves do not interact with each other. It is the
ability to observe them that is the problem. Where they overlap you are
seeing the sum of two independent waves. *When the wave moves beyond the
overlap, it has not been changed. Outside of the area of the overlap, there
is no evidence of the prior overlapping.

Sorry, I respectfully suggest you might be incorrect here. In your
second paragraph, you say "So anywhere they 'overlap' you will see
interference.This is superposition". I agree with that.

I think all of us agree that because of the timing of the signal, the
last part of the incident wave will 'overlap' the leading edge of the
echo, just starting to head back to earth. Per YOUR statement above,
they are overlapping and thus will 'interfere'. (and by 'interfere', I
mean your 'super positioning' will cause the leading edge of the echo to
be 'distorted', either because of constructive or destructive addition.
This distorted front edge of the echo will continue on to earth along
with the un-molested last part of the echo. Once the overlap/super
positioning has created the distortion (or interference or whatever you
want to call it), it will stay there. How can you 'UN-ring' a bell that
has been rung?- Hide quoted text -

- Show quoted text -

BP - Seems Like IAPIAT - You Would Have To Be . . .
On The Surface of the Moon to Experience this 'Overlap'.

Down here on Earth you simple get two separate Signals
that come from two different Sources along two separate
Paths to your Earth bound Radio {Location}.

lets talk about reality not iapiat ~ RHF