Focal Point Length Calculator

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Thanks to my friend PotroLoco for this I have used it and it works great for offset dishes . Here is the attachment

I may be missing something, but I don't think that there is any way that this can work for offset dishes. This is a calculator for prime focus dishes.
 
How much does the Freq. affect the focal length? What I mean is, for Ku band you are using a range of frequencies, how do you determine the proper frequency to input into the calculator? Take the center freq?

Edit: I think I answered that myself. I downloaded the Parabola Calculator 2.0 and punched in a few different frequencies and it did not affect the focal point but it did affect the efficiency or more the gain of the dish.
 
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