FUTURE EFFORT During the next year, major emphasis will be placed on detailed definition of solid state concepts. Emphasis in transportation studies will be given to the HLLV, since this element is a major technology and program cost driver. It is also anticipated that key areas of SPS technology effort will be initiated. This effort will include development of a prototype GaAs solar cell and key technologies related to the microwave system, such as solid-state power amplifiers and phase control. REFERENCES 1. Satellite Power Systems (SPS) Concept Definition Study (Exhibits A and B) Final Report, Contract NAS8-32475, DPD 541, MA-04, Rockwell International Satellite Systems Division, SD 78-AP-0023-1 to -7, April 1978 2. Satellite Power Systems (SPS) Concept Definition Study (Exhibit C) Final Report, Contract NASS- 32475, DPD 558, DR MA-04, Rockwell International Satellite Systems Division, SD 79-0010-1 to -7, March 1979
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