On Aug 10, 12:56 pm, d...@92.usenet.us.com wrote:
> The parabolic reflectors scale in size. If you simply enlarge the
> template, your curve will be larger, and the focal point of the parabola
> will be farther out, scaled up on the drawing of the support part.

Just a thought, one could take a hard rubber beach ball and cut it
half, then cover the inside with aluminum foil. It would be more
forgiving in feed horn placement (just aim the whole dish for best
signal).