Experimental Evaluation of the QKH 2244 The preparation for a proposed demonstration of beamed microwave power transmission aboard the space shuttle, sponsored by NASA and its Center for Space Power at Texas A&M University, included the procurement of such a radiation cooled magnetron, designated the QKH 2244. The QKH 2244 magnetron is shown in Figures 8 and 9. Figure 10 shows the QKH 2244 attached to a section of waveguide. The QKH 2244 is basically a microwave oven magnetron that has been fitted with a fin to cool the operating magnetron in a vacuum or space environment. The particular microwave oven magnetron chosen as the tube portion of the QKH 2244 was the Hitachi 2M170. The tube was stripped of its external hardware and magnets before adding the radiator. Although the microwave oven magnetron converts DC power to microwave power with high efficiencies of 60% to 70%, the remaining part of the DC input power appears in the form of heat and must be disposed of.
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