On Jan 22, 9:47 am, David wrote:
dxAce wrote:

David wrote:

and just assumed it was the signal taking two paths around the world
when we heard the echo. This moon bounce is much more plausible I think.

Nah, the long path echo probability is much more plausible.

dxAce
Michigan
USA

Drake R7, R8, R8A and R8B
70' and 200' wires

And as always, don't do business with the Huntington Investment Company, in
particular a fellow named Joseph Klein.

The delay, even via long circumnavigation, is too short to account for
some echoes I've heard. I especially remember such an echo when
listening to the Caribbean in Texas in the morning.

There is something know as "Long Delayed Echo" where it appears that
signals
get trapped in a duct like event in the ionosphere and make several
round the world
trips. At HF very few signals have the power to be detectable via moon
bounce.
Think about it, 2.5MW aimed at the moon with a electronic steerable
antenna.

There are some guys in Oz (Australia) that are detecting US UHF TV
carriers via moon
bounce. Super high gain antennas with very good front end, at the
antenna, amps.

Some LDE stufff.
http://www.df5ai.net/Material/articles5.html
http://www.df5ai.net/ArticlesDL/LEchoes%28E%29.pdf

When I was a kid, about 5,, my parents where making a trip to eastern
Kentucky to visit their parents. My folks could tot stomach "Hill
Billy" music
so mom was always tuning the MW radio looking for something to listen
to.
This was late on a spring Friday afternoon. She tuned in a station
that had
a pronounced echo. The delay was significant enough for my parents to
talk
about it. The main signal was strong but the echo had the common sky
wave
comb filter effect. After maybe ten minutes the echo just fluttered
away leaving
a strong signal that we listened to for the next hour and a half. It
could have been
something in the station patched wrong like a direct and delayed audio
path via
a tape deck. But it has been too many years and my parents, no in
their late
80's, no longer remember the event. I wish I had a recording of it.
The delay was
longer then a syllable, but shorter then a word like 'butter" The echo
would come
in at the second "T". It shifted around somewhat in the delay as well.
51 years
is a long time and while I don't trust many of my memories from that
time, I do
trust this one because it was so odd. Dad was a mechanical engineer
and had
more then a passing knowledge of and interest in electronics. That
event is
etched in my mind. It was the first time my dad didn't have a answer.

Moon bounce of the NAVSPASUR:
http://www.itr-datanet.com/%7Epe1itr/navspasur.html

Moon bounce of US UHF TV stations:
http://www.geocities.com/toddemslie/moonbounce_DXTV.html

Terry