Digital Audio Radio Service
The most popular type of DARS in the U.S. and Canada is SDARS: Satellite Digital Audio Radio Service, operated by XM Radio and Sirius. XM and Sirius both operate in the 2.3-GHz S band, from 2320 to 2345 MHz.
In areas with weak signals, such as downtown areas with tall buildings or parking garages which block satellite signals, Terrestrial repeaters are installed to re-broadcast the signal to ensure continuous coverage.
Increasing the spectrum available for more services would be difficult, since unlike C-band and Ku band services, which allow over 200 locations for satellites, S-band satellites must be spaced too far apart for current technology. Existing vehicle antennas would not allow reception of two different stations on the same frequency, though new technology, requiring different receivers, might be possible.
 See also
- Digital Audio
- Digital radio
- The Digital Audio Broadcasting (DAB) system, a.k.a. Eureka
- Direct broadcast satellite
- Satellite radio
- Sirius Satellite Radio
- XM Radio
- Bruce Elbert, "Satellite Radio – Accomplishments, Opportunities and Risks," SatMagazine.com, March 2005, http://www.applicationstrategy.com/satellite_radio_ATSI.htm, Retrieved on 2008/05/07.
- http://www.1worldspace.com/1/corporate/ Worldspace Corporate Information
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