[Laser] street light EME

[youngjs at aol.com]

Would it not be 300hz/360hz because lights are wired to different 
phases of the 3 phase distribution system?

de john - KA5NQK




-----Original Message-----
From: Tim Toast <toasty256 at yahoo.com>
To: laser mailinglist <laser at mailman.qth.net>
Sent: Sat, 21 Jul 2007 8:10 am
Subject: [Laser] street light EME



Hello all
i just wanted to remind everyone with a telescope or other
large optics with PGP RX's or other receivers mounted to
it, to try pointing it at the dark side of the moon this
weekend during the first quarter moon phase. Just for fun
of course. Dont expect to hear much, but if you have some
of the DSP software, try listening for the 50hz (100hz) or
60hz (120hz) buzz from countries on the alternate power
frequencies.
If you have narrow band filters for the sodium street light
wavelengths (in the 550nm to 625nm range) that would
definitely help. But even if you dont i'd still try it
anyway, if for nothing else, practice for this winter and
next year :) A million street lights cant be wrong...

During the first quarter phase, the moon will drift away
from where you're pointing if the telescope isn't driven,
but it drifts off the dark side into space, so you don't
have to worry as much about getting the lit portion of the
moon in the field - where as in the last quarter phase,
things will be reversed and the lit portion of the moon
will drift INTO your field of view with non-driven scopes.
I guess you will be limited by the size of your photo
detectors as to how much of the dark side (earth shine
side) will fill the detectors FOV. With equatorial driven
scopes you can get the maximum amount of earth-shine area
and not worry too much about blinding the detector. But
with un-driven scopes, you might be better off with lower
magnifications so you wont have to move the scope too often
while tracking it. If you can track the moon for an hour or
more, use the highest res settings on your DSP software
(say 120 second/dots with Argo for instance) listening as
hard as you possibly can near either 100 Hz or 120 hz
depending on which country you are in.
Also go get yourself a copy of 'Home Planet' software, it's
free and shows a view of the earth from the moon in real
time so you can see which parts of the earth are visible
from the moon at any point in time. -you can also go
backward or forward to any date and time (see the next
lunar eclipses in late August of this year and february
next year).
I went back to see how things looked at the time Yves F1AVY
was seeing 120 hz buzz from his location in France during
an eclipse. It looks like most of the buzz was coming from
south America, although the moon was rising on the east
coast of the USA too and so that also contributed to the
total signal i'm sure - New York and Manhattan are probably
among the brightest 120hz sources on earth. In addition,
Saudi Arabia is also on 60hz power, so it may have also
contributed some. The moon rose fully eclipsed from my
location in Alabama that night, i remember it well.
So anyway, it's worth a try if you're set up for it. Here
is a link to Yves' pdf file on his experiment if it is
still posted there:
http://partner.oodrive.com/easyshare/wjshacc?action=view&key=vDpeJh33NYFU&isi=
109692&ci=50044&wid=29

or try this one:
http://tinyurl.com/24729z

several people have the file so if all else fails ask one
of us for it via direct email.

links to Yves posts on this topic:
http://mailman.qth.net/pipermail/laser/2007-June/001856.html
and
http://mailman.qth.net/pipermail/laser/2007-June/001858.html





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