| Satellite Digital Audio Radio Service
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| | nearly hundreds of kilometers without
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| (SDARS):SDAR is a satellite-based
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| | ever having to change the radio station!
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| direct-broadcast radio service in which
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| | Not
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| digitally encoded audio entertainment
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| | only would you never hear static
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| material is broadcast to
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| | interfering with your favorite tunes, but
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| Earth-based receivers, either directly
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| | also the
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| from an orbiting satellite, or from the
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| | music would be interrupted by few or no
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| satellite to
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| | commercials.Satellite radio companies are
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| the receiver via a repeater station
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| | comparing
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| (This is a special case in which the
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| | the significance of their service to the
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| receiver is in a
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| | impact that cable TV had on
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| shielded location). SDARS is a radio
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| | television 30 years ago. Listeners won't
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| communication service through which audio
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| | be able to pick up local stations using
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| programming is digitally transmitted by
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| | satellite radio services, but they will
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| one or more space stations directly to
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| | have access to hundreds of stations
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| fixed, mobile, and/or portable stations,
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| | offering a
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| and which may involve complementary
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| | variety of music genres. Each company
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| repeating terrestrial transmitters,
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| | has a different plan for its broadcasting
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| telemetry, tracking and control
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| | system, but the systems do share
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| facilities.
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| | similarities.XM Satellite Radio, Sirius
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| Through SDARS compact-disc quality audio
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| | Satellite
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| is available because of digital
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| | Radio and WorldSpace satellite
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| transmition
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| | individually provides digital-audio
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| is employed.History of Satellite
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| | radio services (SDARS), with
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| Radio:Satellite radio is an idea over a
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| | commercial-free programming,
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| decade long. In 1992, the U.S.
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| | digital-audio quality, and
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| Federal Communications Commission (FCC)
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| | countrywide coverage. Each company
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| allocated a spectrum in the
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| | offers nearly 100 channels of digital
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| "S" band (2.3 GHz) for nationwide
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| | music and
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| broadcasting of satellite-based
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| | talk radio (many of them commercial-free
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| Digital Audio Radio Service (DARS). Only
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| | or with a reduced number of commercials)
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| four companies applied for a
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| | that can be received from coast to coast
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| license to broadcast over that band. The
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| | with no service interruption. Each
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| FCC gave licenses
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| | offering number of music channels, these
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| to two of these companies in 1997. CD
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| | services clearly provides programming
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| Radio (now Sirius Satellite Radio) and
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| | options
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| American Mobile Radio (now XM Satellite
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| | not available through traditional
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| Radio) paid more than $80 million each
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| | radio.One of the main feature of SDARS is
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| to use space in the S-band for digital
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| | SDARS provides almost Commercial free (or
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| satellite transmission. The first
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| | Commercials are restricted) programs. And
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| satellite based radio launched by XM on
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| | also it provides news, weather forecasts,
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| Sep 25, 2001, then followed by Sirius on
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| | and sports apart from
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| July 1, 2002. At this time, there are
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| | entertainment-based programs The primary
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| three space-based radio broadcasters:
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| | application for this service is constant
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| Sirius Satellite RadioXM Satellite
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| | coast-to-coast coverage of radio for
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| RadioWorldSpace Satellite Radio
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| | cars. We have all experienced the problem
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| Importance and significance of Satellite
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| | of trying to listen to radio on a long
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| radio:We all have our favorite radio
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| | trip. Both AM and FM stations fade in and
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| stations that we preset into our car
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| | out as we drive into and out of their
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| radios, flipping between them as we
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| | coverage
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| drive to and from work, on errands
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| | area. Portable full satellite radio
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| and around town. But when you travel too
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| | service available now a days for
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| far away from the source station, the
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| | the car, home stereo and personal radio
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| signal breaks up and fades into static.
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| | environments. Car manufacturers have been
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| Most radio signals can only travel about
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| | installing satellite radio receivers in
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| 30
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| | some models for a few years now, and
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| or 40 miles from their source. On long
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| | several models of portable satellite
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| trips that find you passing through
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| | radio receivers are available from a
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| different cities, you might have to
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| | variety of
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| change radio stations every hour or so as
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| | electronics companies.Signal reception
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| the signals fade in
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| | is generally poor as well as variable in
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| and out. Now, imagine a radio station
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| | the cases of AM or FM. With the SDARS
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| that can broadcast its signal from more
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| | systems, radio coverage throughout the 48
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| than 22,000 miles (35,000 km) away and
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| | continental states is solid and
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| then come through on your car radio with
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| | continuous.
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| complete clarity. One could drive
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|
