Focal Length of C & KU band dishes.

SENTHIL KUMAR

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Focal length of the prime focus dish. ( c - band )


Focal length is one of the important number in prime focus dish.

This indicate which is the correct position to fit your LNB on scalar ring.


Calculation. ( Examble : 6 feet prime focus dish )

Diameter = 180 cm. ( D )

Depth = 30 cm ( d )

so, Focal length ( F ) = D*D / 16*d

F = 180*180 / 16*30 = 67.5 cm.

So LNB is fixed 67.5 cm distance from the centre of the dish.


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Focal length of Offset dish ( KU BAND )



Focal length = ( w*w*w ) / ( 16*D*H )

W = width of dish ( 600 mm )

D = depth of dish ( 50 mm )

H = height of dish ( 700 mm )


Apply the values in formula.

Focal length = ( 600*600*600 ) / ( 16*50*700 ) = 385.7 mm.

we convert it into centimeter = 38.57 cm.


So focal length of offset dish - 38.57 cm


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RE: Focul Length of C & KU band dishes.

informative share :clap
 
In case of Ku band (offset dish) the focal point is 38.57. What does that mean? 38.57 away from what? Kindly elaborate as to where can we fix the lnb
 
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