Communications transponder performance for Japanese Communications Satellite-2 and prospects for future systems |
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Authors: | T Okamoto E Suzuki Y Nagai Y Kasuga |
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Institution: | National Space Development Agency of Japan (NASDA), 2-4-1, Hamamatsu-cho, Minato-ku, Tokyo 105, Japan;Telecommunications Satellite Corporation of Japan (Telesat Japan), 2-12-18, Daimon, Shiba, Minato-ku, Tokyo 105, Japan;Nippon Telegraph and Telephone Public Corporation (NTT), 1-1-6, Uchisaiwai-cho, Chiyoda-ku, Tokyo 100, Japan;NEC Corporation, 4035 Ikebe-cho, Midori-ku, Yokohama 226, Japan |
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Abstract: | Communications transponder for the Japanese Communications Satellite-2 (CS-2a and 2b) to be launched into a geostationary orbit by N-II launch vehicle in February and August, 1983, has been developed. The transponder is provided with six-channel K-band () transponder including beacon transmitter, which operates in the highest frequency ranges ever utilized on an operational communications satellite, and two-channel C-band () transponder. Receiver front end of the K-band transponder consists of a direct mixer followed by a 1.8 GHz IF amplifier and provides 8 dB noise figure. 20 GHz output power is 4 W by final amplification at 5-W TWTA. C-band transponder provides 4 dB noise figure and 4.3-W output power. Key factors for future high capacity transponder are also presented. |
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