Satellite radio is one of the biggest enhancements in broadcasting since the roll-out of FM. Satellite radio transmission can easily be broadcasted further than 35,000 kilometers (22,000 miles) with complete clarity and high quality sound. You will never get static interferences whilst listening to over 100 radio stations. The idea driving satellite radio came out in 1992, once the United States Federal Communications Commission granted a spectrum of the S band (the 2.3 GHz frequency) for Digital Sound Radio Service. The license to broadcast in that band was allocated to Sirius Satellite Radio and XM Satellite Radio in 1997. Now there are three firms which offer satellite radio Sirius and XM in Northern America and WorldSpace in Asia, Europe and Africa.
These firms offer distinct broadcasting methods, since the radio transmission of each is actually proprietary. That implies that you'll have to buy different equipment based on your own subscription to one of these companies. Nonetheless, you will find 3 components common to all satellite radio services: the satellites, the ground repeaters and the radio receivers. Different satellite radio companies broadcast the radio transmission in different ways. For instance, XM satellite radio makes use of geostationary satellites which have orbits which are synchronized with the motion of Planet. These satellites are located over the equator. To be able to enable subscribers to get crystal-clear signals in spite of obstacles such as structures, mountains or bridges, XM satellite radio service has put in a network of repeater antennas that get the radio signal through the satellites and retransmit it to the clients receiver Sirius, on the other hand, makes use of satellites which have special elliptical orbits around Planet. This type of orbit enable satellites to get higher in the heavens compared to geostationary satellites and this prevents loss of transmission. This is the reason why Sirius has less terrestrial repeaters than XM.
Satellite radio providers have got digital broadcast centers where a huge amount of music in digital format as well as CD format is kept. Radio programmers have the task of selecting which song has to be played at which time. There are lots of studios maintained by digital radio companies in which artists perform live. All songs and material will be sent to the satellites in digital format so that the transmission consists of very high quality sound. The transmission is actually encoded by the satellite and also then retransmitted to the repeaters antennas, which in turn transmit it to the radio receiver that decodes it and plays the sound. The entire process is very quick and reliable. Satellite radio would not be possible without digital compression. Digital compression is actually a method that uses advanced algorithms to shrink as much material as possible for the available bandwidth. When you get a subscription with a satellite radio provider you'll need the appropriate radio equipment. Conventional radios cannot decode the signal obtained from satellites so you'll need special equipment.
The popularity of satellite radio has exploded because of numerous technical advancements which allowed manufacturers to offer the receivers at extremely appealing prices. The fact that satellite radio is actually commercial free for many of its channels is also a significant marketing issue.
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