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History
Worldnet broadcasts over East Asia, Europe and Africa.
Terrestrial Vs. Satellite
Satellite radio traces back to the early 1990s with the start of Digital Audio Radio Service. The Federal Communications Commission approved the creation of a special "S" band broadcasting channel that would allow commercial users to use up to 2.3 gigahertz of broadcasting power along the radio wave spectrum. The first companies to receive approval for broadcasting in 1997 were Sirius and XM. XM's first broadcast was in September 2001, and Sirius began broadcasting under the name CD Radio in July 2002.To understand how satellite radio works, you should have a little understanding of terrestrial radio. Terrestrial radio broadcasts come from a ground-based station. They are sent over the radio wave spectrum but must share it with other broadcasts. Since the spectrum can be limited, most terrestrial broadcasts can be heard for only a few hundred miles, provided there are no interrupting objects like hills, tall buildings, mountains, bridges or interference from aircraft.
With satellite radio, this broadcast is virtually uninterrupted. As mentioned earlier, there are only a few companies using satellites, allowing for almost no interference. You could essentially listen to the same station from Los Angeles to Bangor, Maine. The only interruption would come if you entered a tunnel, were caught in some weather systems or encountered an unusually large land object.
Broadcast Setup
The XM radio company paid more than $80 million for the rights to broadcast from space. To make the most of its money, XM uses a combination of ground systems and space systems to keep the music going anywhere in the country. A ground station based in Washington, D.C., sends the digital signals for XM's 100-plus channels to its two satellites in space. The first satellite is named Rock; the other is named Roll.
Those satellites then broadcast the music back to earth, where your XM receiver can replay the songs. To help out in urban areas, where tall buildings might interfere, XM uses terrestrial repeaters that strengthen the satellite broadcast on the ground.
Car Setup
Setting up a satellite radio in your car is almost easier than installing a traditional radio. The satellite antenna is much smaller and doesn't have to be placed on the edge of your hood or trunk. As long as there are no obstructions, the antenna can be placed anywhere on the exterior of your car, with the wire running to the dash-mounted radio. You would then plug the radio's power source into your car's cigarette lighter.
Equipment Cost and Subscription Fees
Satellite radio does not come free. XM and Sirius require monthly subscription fees that are usually less than $20, depending on the programs you want. Satellite radio systems for your vehicle can be bought for less than $100. For more portable systems that can be used in the home or on the go, you may have to pay up to $300.
