Satellite Radio System

The idea of having satellite radios has been around for over the last ten years. The major steps towards realizing this idea was taken in 1992 when the United States FCC (Federal Communications Commission) set aside a part of the “S” band (2.3GHz) to be used for satellite based broadcasting. The broadcast was to be available nationwide through the DARS (Digital Audio Radio Services). At that time, only four firms showed interest in broadcasting at that band. In 1997, the FCC licensed two of these companies to start broadcasting. These companies were American Mobile Radio and CD Radio. Later on, they came to be known as XM Satellite Radio and Sirius Satellite Radio respectively. Both companies paid over $80 million each to acquire the licenses for satellite broadcasting.
Today, there are two active satellite radio stations: Sirius XM Radio and WorldSpace
There has been much debate on the significance of satellite radios. Companies providing satellite radio broadcast compare their significance to how cable TV impacted television viewing over three decades ago. While satellite radio listeners cannot listen to local stations, they are provided with hundred of stations specialized in varied music genres. While each satellite radio company has a different broadcasting system, they have a number of similarities. There are three main components that these stations share: satellites, ground repeaters and radio receivers.
Just like satellite television, you have to purchase a receiver before you can get to enjoy satellite radio. Moreover, you also have to buy a listening package that will give you access to a number of channels. There are three main satellite radio companies at the moment. Theses are XM Radio, Sirius Radio and WorldSpace. XM and Sirius have been merged  to be a single station although their services are not yet fully integrated  mainly due to their differences in software and hardware.
Before you receive your broadcast,   a signal will be transmitted from the satellite radio's ground station to active satellite in the atmosphere. The satellite will bounce back the signals in digital form to radio receivers on earth . The receivers will receive and unscramble the signals, which usually have over 170 channels of  digital audio.  The signal does not only contain the encoded sound, there is  also information  about the broadcast. On your satellite radio, you will be able to see the artiste, song title, and music genre. This is one of the advantages  that satellite radio has over conventional ground radio.
In some areas where the satellite signals could be blocked by tall buildings, the satellite companies  use ground transmitters to supplement their broadcasting systems. You must have a satellite radio receiver to enjoy satellite radio. The receivers usually have a small antenna for receiving the signal.
Today, satellite radio receivers have become very popular. Some automobile manufactures  also fit their cars with the receivers. These is an added value to the consumer as he can enjoy whichever genre of music he wants anywhere and at anytime he wishes.