Originally Posted by
mtv
FD can vary greatly, depending on the diameter and depth of the parabola.
As mentioned, look at the specs of the dish manufacturers to give you an indication.
Some designs can even be specific to a particular feedhorn etc.
There's a plethora of information available on the web.
No offense intended, but if you need to ask these types of questions in a public forum, suggests you have very little knowledge and understanding of parabolas, which in turn will limit your chances of manufacturing success.
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