Building Automation > Sat and earth systems

The widespread television users through telecommunications networks can use different methods of transmission in different parts of the network. According to the method of transmission used in the section of network that reaches the user, the television has been: in the terrestrial TV transmission method uses radio waves emitted from transmitters placed on the land surface, in the satellite television transmission method uses waves emitted by radio television if the method of transmission to satellite television, similar to terrestrial television and unlike cable television, offers seamless coverage of the geographic areas served. It means that admissible in any point of the geographic areas served also on the move within these areas. It needs to forcefully, unlike terrestrial television, an antenna of substantial size.
While the terrestrial television and cable television serves most areas does not exceed the nations, satellite television normally serves continental regions instead. With satellite television, people can receive television stations from other countries.
Satellite television allows a perfect reception in mountainous areas, areas where terrestrial television has difficulties to provide a perfect reception, but with digital terrestrial television the difficulties are much reduced. Unlike terrestrial television, between the antenna and transmitter there must be some type of obstacle. It is not possible to receive satellite television by placing the antenna inside buildings, as is possible to do with terrestrial television.