Then XM Radio powered down "Rock" and "Roll." The older satellites remain in orbit and can serve as backups, if necessary.
XM Radio's ground station transmits a signal to its two active GEO satellites, which bounce the signals back down to radio receivers on the ground.
Each satellite radio receiver uses a small, car-phone-sized antenna to receive the XM signal.
In urban areas, where buildings can block out the satellite signal, XM's broadcasting system is supplemented by ground transmitters. XM began delivering chipsets to its XM radio manufacturing partners in October 2000.Part of the reason for this is due to differences in hardware and software.XM Radio uses two Boeing HS 702 satellites, appropriately nicknamed "Rock" and "Roll," and two BSS 702 satellites it calls "Rhythm" and "Blues," placed in parallel geostationary orbit, two at 85 degrees west longitude and the other two at 115 degrees west longitude. View album art, create your own music channel with Tune Mix, and never miss a moment with 30 minutes of pause and rewind.
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