Focal distance

[RT-Cat]

I know the formula for focal distance on a prime focus dish, but can anyone steer me in the direction of info on how to calculate it for an offset dish. Last time I saw one it looked like you needed to know advance calculus to get the answer. Any simple way to figure it out?

 

[Pixl]

One way without having to compute it is to try to look up the technical data from the dish manufacturer.
Lets say you have a Prodlin 1.2m dish. You could look here.
http://satcomnow.com/satcom/pdf/1123geo.pdf

 

[FaT Air]

Parabola Calculator version 2.0 includes Wifi calculations for centered or offset feedhorn dishes.

 

[RT-Cat]

Thanks guys. Both look very useful.
I have info on dish install experience today in the Shack.

RT.