[Laser] street light EME

[J Forster]

Art wrote:

> I think the only way to confirm that you're hearing it off the moon
> is to set the receiver up on a fixed mount and let the Earth movement
> sweep the receiver across the face of the Moon. If the signal peaks
> in amplitude when the Moon is in the field of view, then I'd say you
> heard it off the Moon.

No. You could do a double beam experiment. On and off the Moon.

> This would require a relatively narrow field of view receiver and the
> ability to capture and save 2 hours of digital recordings, for post processing.

Not necessarily. Put the FOV on the Moon. Do a spectral scan. Move it off and scan
again. Compare the components.

> My guess is that a PMT would not be usable for this as it would
> saturate and get 'flashed' and be useless due to high noise
> after  the tube got flashed. But, a photodiode would have no such
> issue, despite the lower sensitivity.

I NEVER SAID I used a PMT on the Moon. Anyway, photometers have filters and
apertures. My FOV was <1 arc second.

> I have a question about DSP though...... IF the 60 and 50 HZ noise
> sources are out of phase with each other, are they detectable or do
> they just end up cancelling each other out??? I would think the 50/60
> Hz off the Moon would be very widely shifted with respect to phase.

There is no reason to believe the 50 and 60 Hz grids are synchronized although each
holds it's average frequency long term to keep time properly.

> >I tried this experiment in about 1971 or 2 using a Boller & Chivens 24"
> >telescope, PMT photometer, and a Tektronic 535A scope with Nelson Ross
> >spectrum analyzer plug-in. I was not looking at the moon, but at the
> >sky. There was significant 120 Hz and various harmonics. My point is
> >that make sure your signal is actually coming from the Moon, not your
> >sky. Yes, I get it with the 50-60 Hz bit.
>
> _