Fig. 13. Single-pass satellite construction base (SCB). need to be about 125°C for high efficiency and reliable operation. Two concepts, shown in Figs. 11 and 12, have been developed to satisfy these and other SPS requirements. The concept in Fig. 11 solves the thermal problem by decreasing the power density on the antenna, resulting in an antenna which is 1.4 km in diameter compared to 1 km for the reference concept which uses klystrons. Power distribution and control is still a serious problem for this concept. Another concept, shown in Fig. 12, solves the power distribution problem by having the solid-state amplifiers back-to-back with the solar array. The thermal problem is solved by the very low power density. The sun is reflected onto the solar array using large primary and secondary mirrors. The primary mirror is continuously oriented at the sun while the transmitting antenna (and attached secondary mirrors) are rotated to continually point to earth. Because of their unique requirements, considerable effort needs to be placed on the solid state concepts to achieve designs with data comparable to the reference concept. SPS construction SPS construction studies considered satellite and ground receiving facility construction. Satellite construction trade studies compared a serpentine approach (where one bay is constructed at a time) to a facility that simultaneously constructs all bays. As a result of this study, the single pass facility was selected for further definition. This facility is shown in Fig. 13. This figure shows the locations of the beam fabricators, the solar array installation facilities, and the reflector installation facilities. Details were developed for these facilities and the microwave antenna facility. An end-to-end analysis of construction of the ground receiving facility was conducted. The overall sequence is shown in Fig. 14. The resulting facility layout is shown in Fig. 15.
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