Abstract
This paper describes the Despin Drive Assembly and associated control electronics employed for despinning and positioning the reflector of the HELIOS High Gain Antenna so that the pencil beam is pointed in the required direction, that means towards the earth. Further the development of the system, with particular emphasis of the critical problems that arose and their solution, and the post-launch experience with the HELIOS-A/B space craft, launched in December 1974 and January 1976 respectively, are discussed.
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