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Satellite radio question

  1. Jul 31, 2006 #1
    this may be kind of dumb question but...

    How do XM and Sirius broadcast so many stations? Isn't evey broadcaster given one frequency.
     
  2. jcsd
  3. Jul 31, 2006 #2
    nobody has an answer?
     
  4. Jul 31, 2006 #3

    chroot

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    The technology used for microwave satellite digital data transmission is quite a bit different from that used for plain old analog FM radio.

    Both satellite radio systems (XM and Sirius) actually use approximately 12 MHz of bandwidth to transmit a 7.5 Mbps digital stream. The entire stream, comprising 100+ channels of audio, is recovered by every receiver. The different audio chnanels are encoded at different bit rates, depending up the fidelity necessary for acceptable sound reproduction.

    http://www.elecdesign.com/Articles/Print.cfm?AD=1&ArticleID=5603

    - Warren
     
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