Discussion
What advantage does a Cassegrain give a receiving earth station?
Answer: D
Feed line loss ahead of the amplifier adds directly to the system noise temperature, so placing the amplifier at the vertex where the run is a few centimetres rather than at the focus is worth a great deal of sensitivity. The subreflector contributes no gain and in fact adds blockage of its own, and while small beam movements by subreflector tilt are possible they are a secondary benefit. Noise temperature considerations dominate the design of any receiving station.
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