1976 JSC Evaluation Of SPS Vol2

TABLE IV-APP-1 (Cont'd) TRANSMITTING ANTENNA ATTITUDE CONTROL BY ROTARY JOINT WITH TWO AXES OF ROTATION. SSPS CONTROL IS REACTION JETS WITH ARGON PROPELLENT PREFERRED (15-50 X 103 KG/YEAR); OVERALL POINTING ACCURACY IS 1° TO THE SUN. ATTITUDE CONTROL AND STABILIZATION MAJOR STRUCTURES TRANSMITTING ANTENNA HAS RECTANGULAR GRID STRUCTURAL LAYERS USING TRIANGULAR GIRDERS MADE OF GRAPHITE EPOXY WITH THERMAL COATING; PRIMARY STRUCTURAL GRID IS 108 X 108 X 35 M AND SECONDARY GRID IS 18 X 18aX 5 M; TOTAL WEIGHT IS 0.14 X 10° KG. POWER GENERATION STRUCTURE DESIGN IS NOT DISCUSSED; WEIGHT IS 2.14 X 106 KG. TRANSMITTING ANTENNA - NOT DESCRIBED. FACET CONTROL + 5°, SERVO ACTUATORS - HUB MOUNTED- SENSOR CONTROLLED FROM CENTRAL CAVITY. TRANSMITTING ANTENNA WEIGHT 0.76 X 10° KG (INCLUDE R. JOINT). RECTANGULAR, FOLD-OUT BEAM t STRUCTURE-ALUMINUM - CAVITY SUPPORT ABOVE CONCENTRATORS. CONCENTRATOR STRUCTURE FORMED ON ORBIT OF FLAT STOCK ALUMINUM . ON ROLLS. CONCENTRATOR REFLECTIVE SURFACE OF ALUMINIZED KAPTON. CONCENTRATOR MASS IS .29 KG/M2 25 M DIA BY 25 M LENGTH MAXIMUM LEO PAYLOAD SIZE. (2) REACTION JETS SHOULD BE USED ONLY AS BACKUP. MG. LOOP CONTROL AND SRAV. GRAD. PRIMARY. ADL/RAYTHEON /GAEC BOEING

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