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Re: PrimeStar Dish



Bill,

An offset fed dish will not work as a center fed dish. The offset fed dish
has the exact same curvature of a center fed with the difference that a
different part of the dish is cut off. Imagine taking a 3 foot center fed
dish and cutting half of the dish off so that it looks like a half moon.
This dish would still work with less gain and it would be an offset fed
dish. If you instead cut a ring all around it, the gain still drops but you
have a center fed dish. In both cases the focal point stays in the same spot
with respect to the curvature.

Pieter
N4IP


----- Original Message -----
From: "Bill Hurlock" <bill@hurlock.net>
To: <amsat-bb@AMSAT.Org>
Sent: Tuesday, May 22, 2001 2:11 PM
Subject: [amsat-bb] PrimeStar Dish


> If I where to make the Primestar dish a center feed dish would it work?
> Wasn't sure if the dish is formed specifically for offset feed point or
> not. I was thinking of just putting a transystem at focus right in front
> of dish.
>
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