DCAN 14: Siting and Design of Radio Telecommunication Equipment
Satellite Television Broadcasting
2.21 Several broadcasters transmit signals from the UK and other countries. Television signals are beamed to a number of satellites from a satellite earth station and then direct to home from the satellite, to individual receiving antennas, the more common ones known as satellite dishes. Antennas have to be in direct line-of-sight of the geo-stationary satellite, and almost always have to be mounted outdoors. The satellites for the various services are in different orbital positions, and have to be received by separate antennas, unless steerable or other specialist antennas are used.
2.22 The location of a satellite dish on a building will therefore depend on the direction of the Satellite. The size of the dish will depend on the technology used, the strength of the signal and the possibility of interference from transmissions from other satellites that may be located nearby. In many cases, dishes of 60cm in size or less can be used, but a larger dish may also be necessary where:
- it supplies programmes to more than one television;
- it receives national or international programmes;
- it caters for broadband communication; or
- geographical position dictates the need for a larger dish.
New developments in antenna technology are introducing to the market new kinds of antennas with different visual characteristics.
2.23 Antennas for reception of digital satellite broadcasting signals are generally much smaller and discrete than their analogue predecessors.