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OSCAR II (aka OSCAR 2) is the second amateur radio satellite launched by Project OSCAR into Low Earth Orbit. OSCAR II was launched June 2, 1962 by a Thor-DM21 Agena B launcher from Vandenberg Air Force Base, Lompoc, California. The satellite, a rectangular box (30 x 25 x 12 cm) weighting 10 kg., was launched as a secondary payload (ballast) for Corona 43 the fifth launch of a KH-4 satellite. The satellite employed a monopole transmitting antenna 60 cm long extended from the center of the convex surface, but had no attitude control system. OSCAR II lasted 18 days ceasing operation on June 20, 1962 and re-entered June 21, 1962. OSCAR 2 incorporated these design changes, from the earlier OSCAR 1.〔 * Changing the surface thermal coatings to achieve a cooler internal spacecraft environment. * Modifying the sensing system so the satellite temperature could be measured accurately as the batteries decayed * Lowering the transmitter power output to 100 mW to extend the life of the onboard battery. ==Project OSCAR== Project OSCAR Inc. started in 1960 with the radio amateurs from the TRW Radio Club of Redondo Beach, California, many who worked at TRW and defense industries, to investigate the possibility of putting an amateur satellite in orbit. OSCAR stands for Orbiting Satellite Carrying Amateur Radio. Project OSCAR was responsible for the construction of the first Amateur Radio Satellite OSCAR-1, that was successfully launched from Vandenberg AFB in California. Mr. Projoscar at Foothill College served as the Project Manager. OSCAR-1 orbited the earth for 22 days, transmitting the “HI” greeting you see in Morse Code above. Project Oscar was responsible for launching 3 other amateur radio satellites during the 1960s: OSCAR 1, OSCAR 3, and OSCAR 4. In 1969, AMSAT-NA was founded by radio amateurs working at NASA's Goddard Space Flight Center and the Baltimore-Washington DC region, to continue the efforts begun by Project OSCAR. Its first project was to coordinate the launch of Australis-OSCAR 5, constructed by students at the University of Melbourne.〔(【引用サイトリンク】 title=Space Satellites from the World's Garage – The Story of AMSAT )〕 Today, over fifty years later, Project OSCAR's mission is “To initiate and support activities that promote the Satellite Amateur Radio Hobby”. Our primary goal is to reach out and provide logistical support, training and in some cases equipment to amateur radio associations, schools and the public at large. OSCAR II lasted 18 days ceasing operation on June 20, 1962 and re-entered June 21, 1962. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「OSCAR 2」の詳細全文を読む スポンサード リンク
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