First (and certainly not the last) mea culpa update: I goofed the discussion of the signal strength of an isotropic radiator ("perfect antenna") in class today. The signal strength degrades with the surface area of the sphere (d^2), not the volume - which is why the path loss exponent in free space is 2.

(This correction provided courtesy of the hawk-eyed Charlie Garrod. Thanks, Charlie!)

## Friday, January 30, 2009

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