[UFO Chicago] Wirelessness in Chicago

[Nate Riffe]

Just now Nick Moffitt made 15 LEDs in my apartment flash with this:
> begin  Nate Riffe  quotation:
> > The best way to work within these limitations is to connect the
> > endpoints of point-to-point links via clear line-of-sight paths
> > using highly directional antennas.  That way, the only factor is
> > free space loss, which is the natural fading of a signal the further
> > you are from its source.
> 
> 	Mind your fresnel zones!  

Bless you, Nick!

The fresnel zone is the egg-shaped area around the line-of-sight.  It
too, should be free of obstructions in order to have a _clear_
line-of-sight.  An obstruction in this zone introduces what is called a
"knife-edge diffraction" which is different from either attenuation or
reflection, but I am not yet familiar with the details of this
phenomenon.

-Nate

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pub  1024D/05A058E0 2002-03-07 Nate Riffe (06-Mar-2002) <inkblot@movealong.org>
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