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Why is the high-gain antenna fixed on the spacecraft rather than on a gimbaled arm?

April 26, 2017antenna arm fixed gimbaled high-gain spacecraft

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Why is the high-gain antenna fixed on the spacecraft rather than on a gimbaled arm?

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Early in the spacecraft design phase, a decision was made to mount the antenna directly on the spacecraft. There were two reasons: it reduced the mission design and construction cost, and it reduced risk of failure of the arm to extend the antenna after launch.