Figure V-3.- Partial construction of column/cable configuration. Antenna construction takes place in parallel with the collector construction. The antenna construction facilities are attached to the appropriate column fabrication facilities. The antenna subarray support structure provides a construction framework for buildup of the concentric ring primary structure. As the concentric rings are completed, installation of the prefabricated antenna subarrays is performed. The antenna power distribution and phase control systems are connected. System checkout is completed and construction equipment is removed. An alternative to the column/cable is the truss configuration. The truss configuration was conceived as an aid to on-orbit construction. With the regular geometry of the truss configuration, a construction base concept as shown in figure V-5 is possible. A large space frame supports the equipment necessary for completion of the collector array. Materials are received and distributed, trusses are manufactured with automatic machines, reflectors
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