[Laser] street light EME

[Art]

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.

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.

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 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.


>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.