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Satellite TV in Australia |
Article Submitted by: Mel C
Thursday, 18 March 2010
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Most people who watch satellite TV never think of where that signal has come from. Certainly it is beamed in from far away on earth, but first it must go right to outer space where it is collected by a satellite before being beamed back to earth. Satellite TV is a much more feasible option for television in a country with vast distance and scarce settlements such as Australia or most of Australia. Imagine laying television cables throughout the whole of Australia or any other country where there are few homes for it to go to. The cost to them would be prohibitive. And in those areas where steep mountains and impenetrable gorges are the normal landscape, laying cables for television would be next to impossible. Thankfully, satellite TV is a means of beaming television programmes into nearly every home without any need for laying cables. It uses an orbiting satellite high above the earths surface to relay the television signal from a transmitting antenna or satellite dish at an uplink facility. Such satellite dishes for satellite TV need to be very large around 9 to 12 feet in diameter. This increases their accuracy and makes the signal much stronger as they are pointed towards the orbiting satellite. The orbiting satellite has transponder on board that is used to receive the signal from earth. After it receives the signal it transmits it back to earth at a different frequency, to what is known as the downlink facility using a parabolic dish. Using a different frequency band avoids interference with the incoming signal. This signal that is received by the downlink is quite weak, but is then reflected into the centre of the dish to what is called the feedhorn, through which the signal is then sent to a device called a low-noise block downconvertor (LNB) for strengthening the signal. So the next time you watch satellite TV remember that the signal has been to outer space and back. Article Source: http://www.ArticleBlast.com |
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