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Message: <blockquote data-quote="Channel Hopper" data-source="post: 796809" data-attributes="member: 175144">Can't recall that discussion in full, but no the f/d ratio does change (slightly) as a result of the increased diameter.If you look at the General Dynamics -  ex Prodelin prime focus range - 3.7m and 4.5m antennas, they use the same mouldings, the 4.5 is the same antenna with extension panels, but the f/d ratio changes from 0.37 to 0.3.Somebody with better maths than me would be able to calculate the change with parabolic formulae.</blockquote>