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The focal length is calculated as follows: f = D x D / 16 x C, where D is the diameter of the dish and "C" is the depth of the dish.

You want to position your LNB so that the focal length distance extends into the LNB's throat about 1/4".

i can't find any label or imprint on the dish itself. there are 4 holes where the orignal legs for the lnb were attached. i have 1/2 " emt conduit to fabricate legs with. my 6' dish with the dmx741 is 26". i am using a dmx741 on this dish also. any ideas? charlie

There is a way to figure the focal length of a parabola dish. I am not a math whiz, but found the information to do so with a Google search when I restored my old Winegard C-band dish. It was pretty easy to do. Try a google search for "focal length of parabola".

Here is a link to one search result that looks pretty good to me: Determining the focal length of a parabolic dish

Here is a link to one search result that looks pretty good to me: Determining the focal length of a parabolic dish

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Why not just draw a string tight across the dish from edge to edge, tie it off on the back side somewhere. Then measure from the string to the face of the dish in the center. Post that value in here and lets see how many different answers come back. We already know the other dimension of 8ft diameter.

Did you extend the legs like I did when I goofed?

1"x1/8" flat stock is cheap enough at the hardware.

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