Satellite Television - How does it work?

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Ever wondered why we have satellite television? I know I have, particularly when we already have terrestrial or broadcast television available. They both seem very similar, the only difference being that with satellite you get lots more choice of channel. Of course there is cable television too, a fierce competitor for both services, but in this article I am going to stick to satellite television.

Sattelite television really becomes important in areas where it is not possible to install cable and the broadcast television reception is poor. Both systems use radio wave signals to transmit and the waves travel in straight lines. That means for broadcast television, which is transmitted and received via land-based antenna, that the natural curvature of the earth will eventually break the signals' line of sight. It also means that other land based signals and obstructions are likely to interfere with the TV signal and cause some distortion.

Using satellites to transmit the signals solves the problem. Stationed more than 22,000 miles above Earth they revolve around this planet once every 24hrs, which is the same time as it takes the Earth to make one full rotation. Therefore the satellite always stays above the same spot on the ground and is said to be in geostationary orbit. Because the satellite is high in the sky the transmission of the waves 'hits' large numbers of customers and people that are in normally inaccessible places are able to receive television. The satellites not only transmit direct to Earth, but they are also linked to each other, making a network to distribute to the largest possible numbers. It also means that once you have set your TV satellite dish in the best position to receive a signal, you shouldn't ever have to move it again.

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When satellite television was first introduced the dishes required to receive the signal were very expensive and people were able to set them up to receive programmes that were not really intended for everybody to see. Nowadays people tend to subscribe to a 'Direct Broadcast Satellite' (DBS) provider such as DirecTV or Dish Network in the US and Sky in the UK. These providers are able to select programs and broadcast them to people as set packages, for example the 'Family', 'Sports' or 'Movie' packages. Cost will depend on which one you choose to buy.

To enable the whole system to make money for the organisations involved in the provision of satellite television, three techniques are commonly employed:

* Advertising

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Organisations pay the network to broadcast adverts. We all hate it but it does pay for our entertainment, or part of it at least.

* Subscriptions

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Users pay a monthly fee to receive a channel or group of channels. In actual fact you pay for the means to decrypt the signal that you receive. There is no way to stop anyone from receiving a signal transmitted from a satellite so they encrypt the signal to make it impossible to view without

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