Communications transponder performance for Japanese Communications Satellite-2 and prospects for future systems
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 (30/20 GHz) transponder including beacon transmitter, which operates in the highest frequency ranges ever utilized on an operational communications satellite, and two-channel C-band (6/4 GHz) 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. The 20 GHz output power is 4 watts by final amplification at 5-watt TWTA. The C-band transponder provides 4 dB noise figure and 4.3-watt output power. Key factors for future high capacity transponder are also presented.
- Publication:
-
Paris International Astronautical Federation Congress
- Pub Date:
- September 1982
- Bibcode:
- 1982pari.iafc.....O
- Keywords:
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- C Band;
- Domestic Satellite Communications Systems;
- Extremely High Frequencies;
- Japanese Spacecraft;
- Transponders;
- Frequency Division Multiplexing;
- Japanese Space Program;
- Radio Beacons;
- Spacecraft Performance;
- Transmitter Receivers;
- Communications and Radar