Thursday, February 9, 2012

The Amazing Technology Of Consumer Satellite TV

February 3, 2010 by  
Filed under News & Reviews

Scientific types may want to turn away. This is a very short, yet interesting, explanation of how does satellite TV work. Even though it has become very popular in the last few years, satellite TV has been around for a long time. The first satellite for TV was put into orbit in\’62.

Back then people who wanted satellite for their televisions had to use a nine foot dish that they put in their back yards. They were really big, ugly, and gave an incredible variety of channels from other countries that made them totally worth the effort. Some people still have those dishes in their back yards. When somebody wants to get channels from a different country they call the neighbors to help them move the dish a tad. There were remotes included with the dishes but those were lost years ago.

The really great thing about these dishes, besides the fact that it was a great excuse not to mow half the back yard, was that you could get programs from other countries. For instance, someone in California could get programming from Canada. Or, when the satellites shifted you could get programs from other countries depending on which satellite you landed on.

Once the satellites became more popular, providers started shooting satellites with transponders up regularly. These geostationary satellites orbit at the same speed as the earth so they don\’t seem to be moving. This made reception even better and it was lots easier to find channels and countries because the satellites were identified. As people became more knowledgeable about where satellites were located they started creating their own programming guides. Those have now been replaced with the onscreen guides provided by the satellites.

Well, nine foot dishes just have never really caught on as a yard ornament in cities and they wanted satellite television also. So, satellite providers came up with little\’\” dishes that could be put just about anywhere on a house with a clear southern exposure and started beaming programs from all of the satellites to the dishes. No more calling the neighbors to move the dish, just a little dish stuck on the side of a building that was easy to move and 500 or so channels to choose from.

Cities had a problem with the little dishes because hardly anybody has an unblocked south view. That\’s when they came up with \”spot beams.\” So, the satellites shoot a signal to the spot beam, that shoots a signal to the dish, that shoots a signal to a television. Okay, it\’s way more scientific than that, but this is the short version, and you get the picture.

The system runs on radio signals that are sent digitally encoded. The guys figured out that they could send more channels through the same bandwidth using this strategies. This is why over five hundred channels are available at any time, twenty-four hours a day. Improvements and advancements continue to be made that are making the dishes smaller and more powerful. It\’s actually amazing how the whole system works.

So, for unscientific types that were wondering how does satellite TV work, there you have it. A really complex system that works really well.

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