SMS (frequency band)
The SMS tape is called Satellite Media Services or Satellite Message Services and, loosely translated, means something like: satellite media tape or satellite message tape . It is a frequency range of the Ku band .
The frequency range was assigned to communications satellites at the end of the 1970s and was supposed to be used primarily for the transmission of radio broadcasts from OB vans to the broadcasting center and from broadcasting centers to each other, as well as for feeding them to cable networks.
However, from the late 1980s onwards, the SMS band was also used by telecommunications satellites, which, as television satellites, broadcast their programs directly to viewers. See: DFS-Kopernikus .
Frequencies of the SMS band
Downlink: 12.5 - 12.75 GHz.
As the uplink frequency range, the SMS band originally shared the range between 14.0 and 14.5 GHz together with the FSS band. This is still the case today with many communications satellites.
This was not possible with satellite systems with many co-positioned satellites. Therefore z. B. in the Astra satellite system, the uplink is carried out between 13.75 and 14.0 GHz.
"Horizontal" and "vertical" are prescribed as polarization directions .