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Satellites in Space


TV broadcast satellites are placed in orbit directly above the equator at a height of around 36000km. They travel through space at the same speed the earth’s rotation – so to us on the ground the satellite appears to be stationary. This is known as a geo-synchronous (or geo-stationary) orbit.


Ground controllers fire on-board jet thrusters occassionally to keep the satellite in the specified position in space. This is the major factor in determining the ‘life’ of a satellite, as onboard fuel does eventually run out.


In Europe the orbital location of a satellite on the Clark Belt is given by the number of degrees to the East or West of due South (for example: Astra 1 = 19.2掳E Bobby Doerr Red Sox Jersey , Hispasat = 30掳W). This is the Azimuth.


The Clarke Belt


The idea of geo-stationary satellites was first suggested by Arthur C Clarke in an article written for Wirless World magazine in October 1946.
The region in space occupied by these satellites is commonly referred to as ‘The Clarke Belt’


Getting signals to and from the Satellite


Television and radio programme signals are sent from the various originating studios to an Earth up-link station. From there the gathered ‘bouquet’ of programmes is transmitted into space using a dish aimed at the orbiting spacecraft. This is known as the ‘up-link’. The frequency is about 14GHz (in Europe)


The satellite receives these signals, amplifies them and transmits them back towards earth on a different frequency. This work is done by a transponder. This ‘down-link’ operates at about 11GHz (in Europe) David Ortiz Red Sox Jersey , in the so-called Ku microwave band).


A group of satellites in the same orbital position (such as Eutelsat’s ‘Hotbird’) may have a combined total of more than 70 transponders. A transponder rebroadcasts 1 analogue TV channel or as many as 14 digital TV channels (this depends on the digital compression techniques used:- lower compression = less channels = better pictures).


This kind of broadcasting is known as DTH (Direct-to-Home broadcasting).


Each satellite has a massive array of solar cells. Some satellites are cube-shaped and have huge wing-like solar cell arrays extending from the main body, while others are cylindrical and