elevation joint mechanisms. Figure 3.2-22 through 3.2-32 give the detail sizes and assumptions made for each item in Fig. 3.2-21. An investigation was made to consider the use of a Linear Induction Motor (LIM) for the rotary joint actuation in lieu of a motorized gear drive. Figure 3.2-33 compares the weight of the motorized gear drive with a large (4000 lb)LIM used on the TACRV (Grumman contract to the Department of Transportation) and a multiple step motor concept. The antenna requirements of low speed and high torque make the multiple step motor a contender as the drive for the antenna.
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