Satellites Frequency Allocations

TABLE 16.22 Partial List of Satellite Frequency Allocations, Frequencies in Gigahertz... 

Table 16.22 contains a partial list of frequency allocations for satellite communications. The World Administrative Radio Conference, WARC-92 allocated L-band frequencies for LEO personal communications services and for LEO small sateUite data relay. The World Radiocommunication Conference, WRC-95,... 

High-power direct broadcast satellites (DBS) or direct-to-home (DTH) satellites operate atKu-band. In the U.S., satellites operating in the broadcast sateUite service (BSS) with downlink frequencies of 12.2-12.7 GHz, deliver TV directly to home receivers having parabolic dish antennas as small as 46 cm (18 in) in diameter. DBS with digital modulation and compressed video is providing more than 150 National Television Systems Committee (NTSC) TV channels from a single orbital location having an allocation of 32 transponder channels, each with 24-MHz bandwidth. 

Beam and polarization isolation Frequency reuse allocates the same bands to several independent satellite transponder channels. The only way these signals can be kept separate is to isolate the antenna response for one reuse channel in the direction or polarization of another. The beam isolation is the coupling factor for each interfering path and is always measured at the receiving site, that is, the satellite for the uplink and the Earth terminal for the downlink. 

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