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Locating focal point on offset dish?

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Christopher Becke

Mar 22nd, 2006 at 3:10pm  
I'm a Physics teacher and am in possession of two old oval DirecTV dishes (24x18 and 19.5x18 in).  Neither has the receiver attached, so I don't quite know where the focal points are.

Is there a convenient way of determining the focal point?  I'm not looking to receive satellite signals, instead, I'm looking to do some sound experiments.

Any help would be appreciated.  (feel free to email me)

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USN - Retired
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Posts: 837
Kentucky (USA)
Reply #1 - Mar 22nd, 2006 at 7:58pm  
The offset to which you refer, is that of the LNB (the receiver). For your purposes, the geometric center of the ellipse is what you're looking for

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