Aussat Ku Band Space Antenna Subsystem,
ROME AIR DEVELOPMENT CENTER GRIFFISS AFB NY
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The Aussat antenna was designed for the first generation of satellites to be used in the Australian national satellite communications system. The wide range of domestic services to be provided by this system includes direct broadcast, high quality television relays between major cities, digital data transmission, voice applications, and centralized air traffic control services. To meet the stringent requirements imposed by this system, and compatibility with the established Hughes HS 376 bus, an innovative Ku band antenna subsystem has been designed, with ten independent beams for communications and separate beams for command and beacon tracking. The antenna farm consists of three shared aperture pairs, each aperture being reused via polarization diversity, resulting in six offset single reflector systems. There are nine independent feed systems, of which two serve both transmit and receive functions by means of diplexers. The transmitted EIRP is 47 dBW for homestead and communities broadcasting satellite services and 36 dBW for fixed satellite services.