Goto Section: 27.54 | 27.56 | Table of Contents
FCC 27.55
Revised as of October 2, 2015
Goto Year:2014 |
2016
§ 27.55 Power strength limits.
(a) Field strength limits. For the following bands, the predicted or
measured median field strength at any location on the geographical border of
a licensee's service area shall not exceed the value specified unless the
adjacent affected service area licensee(s) agree(s) to a different field
strength. This value applies to both the initially offered service areas and
to partitioned service areas.
(1) 1995-2000 MHz, 2110-2155, 2155-2180, 2180-2200, 2305-2320, and 2345-2360
MHz bands: 47 dBµV/m.
(2) 600 MHz, 698-758, and 775-787 MHz bands: 40 dBµV/m.
(3) The paired 1392-1395 MHz and 1432-1435 MHz bands and the unpaired
1390-1392 MHz band (1.4 GHz band): 47 dBµV/m.
(4) BRS and EB§ The predicted or measured median field strength at any
location on the geographical border of a licensee's service area shall not
exceed the value specified unless the adjacent affected service area
licensee(s) agree(s) to a different field strength. This value applies to
both the initially offered services areas and to partitioned services areas.
Licensees may exceed this signal level where there is no affected licensee
that is constructed and providing service. Once the affected licensee is
providing service, the original licensee will be required to take whatever
steps necessary to comply with the applicable power level at its GSA
boundary, absent consent from the affected licensee.
(i) Prior to transition, the signal strength at any point along the
licensee's GSA boundary does not exceed the greater of that permitted under
the licensee's Commission authorizations as of January 10, 2005 or 47
dBµV/m.
(ii) Following transition, for stations in the LBS and UBS, the signal
strength at any point along the licensee's GSA boundary must not exceed 47
dBµV/m. This field strength is to be measured at 1.5 meters above the ground
over the channel bandwidth (i.e., each 5.5 MHz channel for licensees that
hold a full channel block, and for the 5.5 MHz channel for licensees that
hold individual channels).
(iii) Following transition, for stations in the MBS, the signal strength at
any point along the licensee's GSA boundary must not exceed the greater of
−73.0 + 10 log(X/6) dBW/m2, where X is the bandwidth in megahertz of the
channel, or for facilities that are substantially similar to the licensee's
pre-transition facilities (including modifications that do not alter the
fundamental nature or use of the transmissions), the signal strength at such
point that resulted from the station's operations immediately prior to the
transition, provided that such operations complied with paragraph (a)(4)(i)
of this section.
(b) Power flux density limit for stations operating in the 698-746 MHz
bands. For base and fixed stations operating in the 698-746 MHz band in
accordance with the provisions of § 27.50(c)(6), the power flux density that
would be produced by such stations through a combination of antenna height
and vertical gain pattern must not exceed 3000 microwatts per square meter
on the ground over the area extending to 1 km from the base of the antenna
mounting structure.
(c) Power flux density limit for stations operating in the 746-757 MHz and
776-787 MHz bands. For base and fixed stations operating in the 746-757 MHz
and 776-787 MHz bands in accordance with the provisions of § 27.50(b)(6), the
power flux density that would be produced by such stations through a
combination of antenna height and vertical gain pattern must not exceed 3000
microwatts per square meter on the ground over the area extending to 1 km
from the base of the antenna mounting structure.
[ 69 FR 5715 , Feb. 6, 2004, as amended at 69 FR 72034 , Dec. 10, 2004; 72 FR 27712 , May 16, 2007; 72 FR 48852 , Aug. 24, 2007; 73 FR 26040 , May 8, 2008;
78 FR 8270 , Feb. 5, 2013; 78 FR 50256 , Aug. 16, 2013; 79 FR 599 , Jan. 6,
2014; 79 FR 32413 , June 4, 2014; 79 FR 48539 , Aug. 15, 2014]
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Goto Section: 27.54 | 27.56
Goto Year: 2014 |
2016
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