k. Fabricate antenna primary structure. 1. Fabricate antenna secondary structure. m. Install antenna subarrays. n. Install antenna power distribution system. o. Install antenna phasing system. p. Align antenna. q. Checkout system operation. The sequence or phasing of construction steps depends on the configuration of SPS subsystems and the construction approach. Such items as whether the structure is functional when partially completed; whether the configuration is solar oriented or "POP"; orientation during construction; and relationship of the antenna to the solar array during buildup are other significant factors. 4. Types of Construction Processes There are numerous processes or operations that will be necessary in the construction of the SPS. Many are somewhat independent of the construction approach or detail subsystem configuration. The following list provides a reference to the types of processes or operations that must be blended into an overall construction approach: a. Form long structural members. b. Stiffen structural members. c. Join cross members to long members. d. Join assembled structural members into larger truss assembly. e. Attach active elements or modules to structure. f. Align active elements or modules. g. Join current carrying elements of power distribution network. h. Checkout circuits. i. Apply thermal control coatings or finish. j. Deploy preassembled elements such as structural members, solar cell blankets or antenna subarrays.
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