now we track or focus to sun
this was the reflection points from the dish to focal point ( LNB) of five mirrors
then fine tuned to get all points concentrated to one point
now i found that one of the center mirrior is out of focus angle
so that my dish is not well curved to focus at center of the lnb , look at image 3 , that 5 mirrior points are concentrated at one point rather then the center , but one mirrior is compleatly out of feed point , so , this shous , that this dish is nat a perfect illumination , so my lnb positioned should be altered , (
although this dish works good ,
but if we make alter the focal point at center , then picking up the signals will be exlent, if we make it ,
this was simple but , not accurate 100 % ,
now vikram you try your 4 feet dish with this type of illumination at prime focus , see that all points are met at certain point , where the feddhorn can pick the signals
thanks