Goto Section: 25.251 | 25.253 | Table of Contents
FCC 25.252
Revised as of October 1, 2011
Goto Year:2010 |
2012
§ 25.252 Special requirements for ancillary terrestrial components
operating in the 2000-2020 MHz/2180-2200 MHz bands.
(a) Applicants for an ancillary terrestrial component in these bands
must demonstrate that ATC base stations shall not:
(1) Exceed an EIRP of -100.6 dBW/4 kHz for out-of-channel emissions at
the edge of the MSS licensee's selected assignment.
(2) Exceed a peak EIRP of 27 dBW in 1.23 MHz.
(3) Exceed an EIRP toward the physical horizon (not to include man-made
structures) of 25.5 dBW in 1.23 MHz.
(4) Be located less than 190 meters from all airport runways and
aircraft stand areas, including takeoff and landing paths.
(5) Exceed an aggregate power flux density of -51.8 dBW/m^2 in a 1.23
MHz bandwidth at all airport runways and aircraft stand areas,
including takeoff and landing paths and all ATC base station antennas
shall have an overhead gain suppression according to the following.
(6) Be located less than 820 meters from a U.S. Earth Station facility
operating in the 2200-2290 MHz band. In its MSS ATC application, the
MSS licensee should request a list of operational stations in the
2200-2290 MHz band.
(7) Generate EIRP density, averaged over any two millisecond active
transmission interval, greater than -70 dBW/MHz in the 1559-1610 MHz
band. The EIRP, measured over any two millisecond active transmission
interval, of discrete out-of-band emissions of less than 700 Hz
bandwidth from such base stations, shall not exceed -80 dBW in the
1559-1610 MHz band. A root-mean-square detector function with a
resolution bandwidth of one megahertz or equivalent and no less video
bandwidth shall be used to measure wideband EIRP density for purposes
of this rule, and narrowband EIRP shall be measured with a
root-mean-square detector function with a resolution bandwidth of one
kilohertz or equivalent.
(8) Use ATC base station antennas that have a gain greater than 17 dBi
and must have an overhead gain suppression according to the following:
Angle from direction of maximum gain, in vertical plane, above antenna
(degrees) Antenna discrimination pattern (dB)
0 Gmax
2 Not to Exceed Gmax -14
8 to 180 Not to Exceed Gmax -25
Where: Gmax is the maximum gain of the base station antenna in dBi.
(b) Applicants for an ancillary terrestrial component in these bands
must demonstrate that ATC mobile terminals shall:
(1) Observe a peak EIRP limit of 1.0 dBW in 1.23 MHz.
(2) Limit out-of-channel emissions at the edge of a MSS licensee's
selected assignment to an EIRP density of -67 dBW/4 kHz.
(3) Not generate EIRP density, averaged over any two-millisecond active
transmission interval, greater than -70 dBW/MHz in the 1559-1610 MHz
band. The EIRP, measured over any two-millisecond active transmission
interval, of discrete out-of-band emissions of less than 700 Hz
bandwidth from such mobile terminals shall not exceed -80 dBW in the
1559-1610 MHz band. The EIRP density of carrier-off-state emissions
from such mobile terminals shall not exceed -80 dBW/MHz in the
1559-1610 MHz band, averaged over a two-millisecond interval. A
root-mean-square detector function with a resolution bandwidth of one
megahertz or equivalent and no less video bandwidth shall be used to
measure wideband EIRP density for purposes of this rule, and narrowband
EIRP shall be measured with a root-mean-square detector function with a
resolution bandwidth of one kilohertz or equivalent.
(c) For ATC operations in the 2000-2020 MHz band, the power of any
emission outside the licensee's frequency band(s) of operation shall be
attenuated below the transmitter power (P) within the licensed band(s)
of operation, measured in watts, in accordance with the following:
(1) On any frequency within the 2000 to 2020 MHz band outside the
licensee's frequency band(s) of operations, emissions shall be
attenuated by at least 43 + 10 log (P) dB.
(2) Emissions on frequencies lower than 1995 MHz and higher than 2025
MHz shall be attenuated by at least 70 + 10 log P. Emissions in the
bands 1995-2000 MHz and 2020-2025 MHz shall be attenuated by at least a
value as determined by linear interpolation from 70 + 10 log P at 1995
MHz or 2025 MHz, to 43 + 10 log P dB at the nearest MSS band edge at
2000 MHz or 2020 MHz respectively.
(3) When an emission outside of the authorized bandwidth causes harmful
interference, the Commission may, in its discretion, require greater
attenuation than specified in paragraphs (c)(1) and (2) of this
section.
(4) Compliance with these provisions is based on the use of measurement
instrumentation employing a resolution bandwidth of 1 megahertz or
greater.
Note to § 25.252: The preceding rules of § 25.252 are based on cdma2000
system architecture. To the extent that a 2 GHz MSS licensee is able to
demonstrate that the use of a different system architecture would
produce no greater potential interference than that produced as a
result of implementing the rules of this section, an MSS licensee is
permitted to apply for ATC authorization based on another system
architecture.
[ 68 FR 33651 , June 5, 2003, as amended at 70 FR 19318 , Apr. 13, 2005]
Goto Section: 25.251 | 25.253
Goto Year: 2010 |
2012
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