Discussion
Why does a longer focal length reflector tolerate more feed displacement?
Answer: A
With a shallow dish, the geometry is closer to that of a thin optical lens, so the aberration introduced per unit of feed offset is smaller and more beamwidths of scan are available. The penalties are a physically longer structure and a feed that must have a narrower pattern. Illumination evenness, blockage and manufacturing ease all change too but do not explain the scan tolerance. The focal length to diameter ratio is one of the first choices made in any reflector design and it decides several things at once.
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