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http://apps.fcc.gov/ecfs/document/view?id=7521088218
(1)
The U-NII-1 device is a base station that uses an antenna that reduces energy radiated toward Globalstar satellites. Specifically, base
stations must use an antenna that limits effective isotropically radiated power (“EIRP”)
to no more than 125 mW in areas beyond 30 degrees above the horizontal plane. In other words, this requirement would impose a restriction that is equivalent to -9 dBi peak gain, and, as a result would further reduce energy received by Globalstar satellites. Most 5 GHz access point antennas on the market today were not designed to meet this severe limitation. Accordingly, outdoor Wi-Fi network operators will need to make a significant new capital investment to deploy 1 Watt U-NII-1 systems, even though their existing antennas would not cause harmful interference to Globalstar’s operations. Nevertheless,
this EIRPbased framework provides flexibility in compliance with the rule in a manner that Globalstar’s recommended gain-based proposal does not.4
By limiting the EIRP directed upward, the existing population of access points could come into compliance by operating at a lower power level, in contrast to an absolute gain-based standard that provides no flexibility for the robust Wi-Fi ecosystem. Peter Ecclesine, Technology Analyst MS SJ-14-4 170 West Tasman Dr, San Jose, CA 95134-1706
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