Figure 7. Subarray Assembly Figure 8. Solid-State Combiner Radiator Module Figure 9. Antenna Module Voltage Crossover (Without de Converters) subarray. The main features of the combiner radiator module are illustrated in Figure 8. The modules would be integrated into any antenna panel of 8 modules. Each module radiates about 30 watts of linearly polarized RF power. This concept is a more direct substitution for klystrons and can be adapted to the SPS configurations shown in Figures 1 and 3. Antenna module cable weight is very sensitive to the amplifier voltage up to about 500 Vdc. It was determined that at a voltage of about 500 Vdc this impact is negligible. Antenna module voltage cross-over (without de converters) is shown in Figure 9; (i.e., the voltage level at which power transmission would have to be delivered and utilized without de converters). The specific mass of the de converter is shown as a parameter. Westinghouse Electric Corp. (Advanced Energy Systems Division, Pittsburgh, PA) performed a subcontracted study for Rockwell and concluded that the SPS 1990 goals for high-voltage de converters (specific weight goal of 0.197 kg/kW and efficiency goal of 96% for klystrons and 0.271 kg/kW and 92% for solid state) appear to be reasonable.^ High-voltage transmission is desirable because of the large solar array and corresponding conductor masses (with exception of sandwich solid-state concept). High efficiency and lightweight de converters become very important to the SPS (both the satellite and orbit transfer vehicle). ^Satellite Power System Power Distribution Study. Westinghouse Electric Corp., M9L8GDS-897407D (March 10, 1980).
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