[asac] ACA design and imaging study

[Darrel Emerson]

Correction:
  In my point (b), I should have begun:

 "(b) Remember that in combining big dishes with small dishes, you only
get the field of view of whichever antenna has the smallest beam, rather
than the (perhaps at first sight intuitive) geometric mean of the
antenna half-power beamwidths. ..."

   Sorry about missing that typo.  Doubtless there are others.

			Cheers,
				Darrel.