The introduction of satellite radio has been one of the biggest
innovations in recent FM broadcasting history. This radio signal can be
heard at a distances of thirty five thousand kilometers and beyond.
That is more that twenty two miles with a clear reception, no static
and more than one hundred stations to listen to. The inception of this
concept was 1992 when the Federal Communications Commissions gave up
the S band on the radio wave spectrum (2.3 GHz) to Digital Audio Radio
Service. The companies that were initially given a license to broadcast
on this spectrum were XM Satellite Radio and Sirius Satellite Radio.
Currently, there are three satellite radio services broadcasting around
the world: XM and Sirius in North America and WorldSpace in Europe,
Asia and Africa.
The three satellite radio companies each have a different system for
broadcasting their signals. This means that a customer would end up
buying specific equipment depending on what company they subscribe to.
There are three parts to a satellite radio system: the ground
repeaters, the satellites and the radio receivers. The XM satellite
radio has satellites that are geographically located above the equator
at all times. To combat the issue of obstacles such as hills, bridges
and buildings, the XM radio service has a network of repeaters. These
are antennas that get the signal from the satellites and transmit it to
the subscriber’s radio. The Sirrus radio service is set up a little
differently. The satellites are elliptical in structure and they orbit
the Earth. Because these satellites are on a higher level, the signal
is usually clear and there is no need to have quite as many repeaters.
The satellite radio programmers are able to choose what music or
program to fill air time. Many use CD’s or have musicians come in to
perform live. This sound is transmitted via a digital format. The
signal is encoded by the satellite and then sent to the repeater
antennae. The repeater moves it along to the subscriber’s radio which
decodes the signal and plays the sound. Satellite radio also utilizes
digital compression which is a method of reducing a set amount of
information into a bandwidth using complex algorithms. If you are a
subscriber, you will have to purchase the correct equipment to get the
signal.
The amount of people who subscribe to satellite radio has grown due to
the improvements made to the technology. The appeal of the radio
station has always been the fact that the radio doesn’t depend on
advertising to pay the bills, therefore the programs available are
commercial free.
