IV-C-6 POWER DISTRIBUTION - J. PAWLOWSKI, AVIONICS SYSTEMS ENGINEERING DIVISION The microwave antenna electrical power distribution system is designed to bring large quantities of electrical power from the rotary joint interface to the microwave generators. The sizing model used in this study calls for a 10 db 10-step truncated Gaussian taper with klystrons used as microwave generators. The klystrons require a 1.25 amp, 40K volt input, and are located in the suoarrays which make up the antenna. Their density within a subarray is determined by the taper. A block diagram of the electrical power distribution system is shown in Figure IV-C-6-1. Power is distributed from the rotary joint interface to switch gears which are located on the axis of the microwave antenna. Then power is distributed from the switch gears to a subarray distribution point from where it is distributed to individual klystrons located in the subarray. IV-C-6-1 ASSUMPTIONS A lateral power flow distribution system was selected since this method was demonstrated to result in less weight than the other methods investigated in "Microwave Power Transmission Studies" (NASA CR-134886, December 1975) which was prepared by Raytheon for Lewis Research Center (Contract NAS 3-17835). A representative lateral power flow distribution system is shown in Figure IV-C-6-2. An operating temperature of 227°C was chosen because it was considered to be "worse case" according to the Raytheon report. Aluminum wire was selected as a conductor, and wire size was calculated from the formula
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