The Intelsat 4 communications satellite has two spot beam antennas which are pointed to selected land masses by gimbaled positioners. The positioners employ drive motors with electromagnetic brakes and jackscrews that are self-caging during the launch. The positioner uses dry lubricants for ball bearings, spur gears, screw and nut, and various journal bearings. A coefficient of friction of approximately 0.05 was demonstrated in vacuum operation. Success of the positioner was demonstrated on the first Intelsat 4 placed in orbit in January 1971. The developmental problems that were encountered and their solutions are discussed.


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    Titel :

    The Intelsat 4 antenna positioner


    Beteiligte:
    Glassow, F. A. (Autor:in)


    Erscheinungsdatum :

    1972-06-01


    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Keine Angabe


    Sprache :

    Englisch


    Schlagwörter :



    Intelsat

    Sachdev, D. K. | AIAA | 2009


    INTELSAT VIII

    Neyret, P. / Nadkarni, P. / Rush, T. et al. | AIAA | 1994


    INTELSAT 4

    NTRS | 1974


    The Intelsat Arrangements

    RAUSCHENBACH, GUS | AIAA | 1975