Re: New 30THz video


militaryoperator
 

Hi Folks
Bob, G4APV, and I are grateful to Peter, G3PHO, for putting together a video of our activities on 30THz over the past two months. It can be viewed here
I hope you find it of interest.
73
Barry, G8AGN

I'm not getting it. Is it an actual "signal"? or just a version of a light/heat source being received  by a photocell. 
I must have missed the first days class. 
The Germans in WW2 had a voice comms unit using light. Lichtsprechgerät 80/80
Ben 

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