reference signal from the ground utilizes 2-tone modulation with a suppressed carrier near the power beam frequency, to effect conjugation (i.e., electronic fine beam steering) in an efficient manner. Correction for some systematic propagation errors is provided through multiple pilot beam transmitting antennas. Antenna Power Distribution - The power distribution system provides power transmission, conditioning, control, and storage for all elements of the microwave transmitting antenna. Figure B-12 shows a schematic diagram of this system. The antenna is divided into 228 power control sectors, each providing power to approximately 420 klystrons. Two of the kylstrons’ depressed collectors "A" and "B" which require the majority of supplied power are provided with power directly from the power generation system to avoid the dc/dc conversion losses. All other kylstron element power requirements are provided by conditioned power from the dc/dc converter. System disconnects are provided for isolation of equipment for repair and maintenance. A nickel hydrogen battery system provides 12.186 megawatt hours of energy storage for klystron cathode heater power during solar occultations. Up to two hours capacity is provided. DC/DC Converter and DC/RF Generators - Each dc/dc converter (figure B-13) provides power to approximately 0.5% of the total number of antenna klystrons. The klystron with five depressed collectors has a calculated tube efficiency of 85%. Figure B-14 shows a sketch of the reference 80 kw klystron unit. The selected design is a continuous wave (CW) amplifier operating at 42 KV. It uses a compact, efficient (82-85%) solenoid wound-on-body design. 2 To achieve long life, a cathode loading of 0.15 amps/cm was chosen. Figure B-15 shows a drawing of the integrated klystron module. The figure shows the klystron mounted on the back of the slotted waveguide antenna array. The passive cooling system can be seen. Not illustrated here is the phase control system required to insure that the radiation from the modules will be in phase at the rectenna. This system will tie the modules within a subarray together with waveguide and all the subarrays together with coaxial cable or an equivalent transmission link. Each transmitting antenna contains 101,552 of the 70 kw amplifiers and operates with a gain of 83-85 db.
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