How Do XM and Sirius Satellite Radios Broadcast Multiple Stations?

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linux kid
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this may be kind of dumb question but...

How do XM and Sirius broadcast so many stations? Isn't evey broadcaster given one frequency.
 

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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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