> >BUT!  What if the radiator isn't isotrpoic, but has "gain" in a
particular direction?
>
> Inverse square still holds, because the area painted will still be
proportional to the square of the radius.

This assumes (As I noted) that the radiation is effectively just confined to
a spherical subset and is effectively a point source at point of origin. If
the radiator is a non point source that collimates the wave IMO you get non
inverse-square results. Examples might be phased array type systems.

B, IMBW :-)  (as Carl Sagan was fond of saying).



            Russell McMahon

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