Mobitex is a paging airlink. United Wireless & Velocita Wireless are paging carriers.
Paging has relatively low data overhead. Even a 12.5 kHz channel w/ only a 6 dB C/I ratio can theoretically achieve 35 kbps throughput -- enough to quickly deliver a lot of paging messages. As such, paging carriers oft deploy just a few tall "sticks" per market w/ one channel per site.
Long story short, paging carriers use very little spectrum. Sprint Nextel still has the lion's share of SMR 900 MHz licenses.
Try this example. Run a Market Based query at the FCC ULS.
http://wireless2.fcc.gov/UlsApp/UlsS...archMarket.jsp
For Market Type, select MTA. For Market, select MTA001. For Radio Service Code, select YD.
In this example, nearly all of the SMR 900 MHz bandwidth remain in the hands of holding companies located at (drum roll...) 2001 Edmund Halley Dr, Reston, VA. United Spectrum Management Services leases a whopping 0.225 MHz, which allows for nine 12.5 kHz FDD channels.
AJ
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