[Laser] Re: Lunar Eclipse

[Tim Toast]

>All the alternators  are mandatory synchronic because
their >electrical properties.
>They work like  adjustable power generators (E>U) or
>synchronic motors (E<U) 
>but their  rotation speed defines strictetly their
produced >frequency and a 
>shift in  frequency a one to the others is impossible.
>

If all the grid network alternators are synchronized (and
must be to contribute), then there can be only one
frequency generated throughout the whole network (which
drifts slowly). So there is only one line we are looking
for (and its harmonics). This means no matter where you
are, in a given network, you will always see the same
'signature' of the slowly drifting power frequency? And the
only other lines would then be from the other power grids
that are not interconnected with yours. That certainly
simplifies things a bit. 

If the 50hz and 60hz cooperating groups could take an FFT
of their own power frequency signature during an eclipse or
other moon phase, it might be useful for the other groups
to see what they are looking for during the time, as they
later analyze their data. - although the signature
generally shows up on the others lunar data, it would be
nice to have a separate low-noise time-stamped recording of
it. 

I was wondering if this signature could be used to shift
the center frequency of an FFT program in order to
'straighten out' the wandering line. In other words to
convert the drifting frequency into a stable frequency
either during FFT or by pre or post processing it with the
signature. Since you would know exactly what frequency the
other power grid is on at any time during the data.
frequency deconvolution?
http://cat.inist.fr/?aModele=afficheN&cpsidt=1603018

I assume the waveshape of the modulated light a typical
street light emits is very close to a sinewave. But it
would be interesting to see any differences in the several
types of streetlights - waveshapes and FFT displays of
harmonics. Maybe someone has a good view of several types
from their qth and can record and analyze them without
having to take a field trip. 


>> I am not suggesting that this guess is valid.  But if it
is "in the ball
>> park" ( to use the American idom from baseball ) it may
be the effects are
>> as important as synchronicity and travel times from
curved sources and
>> curved reflectors.  If you overlap the effects, it may
be more difficult
>> than was prevously assumed.
>
>One thing to take into account, many HID lamps (Sodium,
>Mercury and
>metal halide) now use electronic ballast, these devices
are >switching power
>supplies and are designed to switch based on the best
>operating frequency.




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