setting feed horn - again

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oldsatfun

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May 29, 2006
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I have to adjust the feedhorn and the scalar ring of a Zinwell lnbf.
Has the focal point to be 1/4" inside the mouth of the feedhorn, or this is correct only for a Chaparral feedhorn ?
In other words, every lnbf/feedhorn is different or 1/4 inch inside the mouth of the feedhorn is always correct ?

My dish is a Fortec Star FS6D, modified to perfectly fit a Jaeger 1224 EL (dual axis HH).
 
The focal point for different feedhorns should be similar, but remember they are adjustable for a reason. Your calculations are only a close estimate. It's still best to fine tune it.
 
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