A number of trade studies on this system have been conducted as listed below: (1) AC vs. DC Transmission - DC transmission at 40 kV is preferred based on power conductor and conditioning equipment mass considerations. (2) Central vs. Decentralized Regulation and Control - centralized system preferred for providing regulated power to the transmit!ng antenna; decentralized system for solar array power control. (3) Flat (sheet) Conductor vs. Round Cable - flat (sheet) conductor preferred based on mass considerations. (4) Conductor Material (Copper, Aluminum or Silver) - aluminum preferred based on thermal control and mass considerations. (5) Use of Structure for Current Return Path vs. Dedicated Conductor - dedicated conductor preferred as a less complex approach. Even though the above preferences are indicated at this time, continued analysis and optimization may result in changes.
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