Abstract
To support the utilization of LAPAN satellites in orbit, it’s needed a reliable receiver antenna system at the Ground Station. This antenna system performance is largely determined by the accuracy of its motor beside the RF Front system (LNA, Feed, Cable dan Receiver) used to track the satellite which is moving very fast in low orbit. The movement of satellites in low orbit is about 630 km around 7.5 km/sec. It requires a driving force motor with high accuracy antenna for satellite tracking in light of obtaining the antenna always in the of line of sight to satellite, so that not experiencing any signal losses.
 (In order) To obtain a reliable antenna system with a better accuracy, the utilization of the Hybrid stepper motor 2 phase design become compulsory. This standard stepper motor has accuracy of 1.8/step and by adding a gear ratio of 100:1 so that the antenna accuracy will increases to 0.018/step. Detailed design and implementation of the stepper motor system accuracy will be elaborated in this paper.
 Key words: Stepper motor hybrid, Low earth orbit, Satellite tracking antena
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