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Message: <blockquote data-quote="a33" data-source="post: 1069092" data-attributes="member: 332642">So, for the calculation:Mark the top and bottom of the working area of the dish. Same for left and right of the dish; so that the 4 points form a perfect diamond.Use the points to measure hight and width.To calculate focal distance: also mark exact middle point of the dish. Measure dish depth at the middle, towards the working area dish face, very precise. Be sure to compensate for the hight of the rim!With these three measures the dish specs can be calculated.To be able to compare calculation outcomes with reality, also measure top string and bottom string, that is distance(s) from top (and bottom) to about 3,5 cm before the middle of the LNB-holder.greetz,A33</blockquote>