At 08:55 AM 3/23/01 -0500, you wrote:
>This brings to mind a military system I heard about, but could never find any
>info on.  Supposedly, someone has developed a communication system based on
>wavelength that prevents reception after a certain distance.  I can't picture
>the physics of this in my brain.
>
>Has anyone out there any knowledge of this?

There's sat-sat com links at 60 GHz, because the atmosphere is basically
"black" at that freq.

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