1.2.2.3 Power Interface and Distribution (Orbital) a. Lateral power flow for minimum weight, b. Recycling switchgear (crowbar) needed for protection against tube arcing. c. Power source and slip rings to be sectored into a minimum of eight independent units to permit a practical switchgear design by limiting maximum short circuit current. d. Cost and weight can be scaled by the square root of input power for system tradeoff studies. e. Magnetic interaction effects are negligible in attitude control system design. For the amplitron: f. Constant current regulation at the converter to maximize power output and minimize phase shift variations with voltage changes. g. Cascade configuration because of low gain characteristic. h. Power source voltage should be 20 kVdc. For the klystron: i. Unregulated operation to maximize power output. j . Parallel operation to minimize failure effects and simplify compensation for phase shift variations with voltage changes. k. Power source voltage should be 40 kVdc. 1.2.2.4 Transmitting Antenna a. The transmitting antenna will be a circular, planar, active phased array on the order of 1 km in diameter. b. Antenna illumination will be truncated Gaussian with tapers of 5 dB to 10 dB, which can be quantized into about five regions of uniform power. c. The antenna will be sectored into subarrays of nominal dimensions 18M x 18M.
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