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azimuth rotation. The stepper motor is driven by an Axis Technology driver, which is in turn controlled by a Personal Computer. The choice of a PC was a convenience for the prototype -- in a production design, and small micro-computer would suffice. Figure 6e shows the azimuth drive.

Figure 6e Azimuth Drive Detail

Elevation Drive: The elevation drive (Figure 6d) uses the same type of stepper motor, belt and drive gear as described above for the azimuth drive. As shown in the Figure, the drive motor is attached to the Azimuth Platform. Each end of the elevation drive belt is secured to the mirror support ring. One step of the stepper motor provides approximately 0.02 deg of rotation. Guides similar to the azimuth drive guides are provided to support free spans of the drive belt. Figure 6f shows the elevation drive unit.

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November 24, 2002

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