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Message: <blockquote data-quote="Channel Hopper" data-source="post: 1004170" data-attributes="member: 175144">A parabolic equation determines the overall point at which all the reflected waves arrive at the focal point, ie the feed horn.For any frequency there is no point in creating a dish that has waves that cancel others out, nor ending up with a shape that makes the scalar feed expensive to produce to the point where it is uneconomical to 'patch'.Stringing a dish is all about checking for transit damage, and how well something in the field has lasted. Once you are there you need to verify the design really is what you need for the specific frequencies you are after and how much money you need to throw at the system without replacing the key components.</blockquote>