[Code of Federal Regulations]
[Title 47, Volume 2]
[Revised as of October 1, 2005]
From the U.S. Government Printing Office via GPO Access
[CITE: 47CFR27.53]
[Page 303-308]
TITLE 47--TELECOMMUNICATION
COMMISSION (CONTINUED)
PART 27_MISCELLANEOUS WIRELESS COMMUNICATIONS SERVICES--Table of Contents
Subpart C_Technical Standards
Sec. 27.53 Emission limits.
(a) For operations in the bands 2305-2320 MHz and 2345-2360 MHz, 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, by the following
amounts:
(1) For fixed, land, and radiolocation land stations: By a factor
not less than 80 + 10 log (p) dB on all frequencies between 2320 and
2345 MHz;
(2) For mobile and radiolocation mobile stations: By a factor not
less than 110 + 10 log (p) dB on all frequencies between 2320 and 2345
MHz;
(3) For fixed, land, mobile, radiolocation land and radiolocation
mobile stations: By a factor not less than 70 + 10 log (p) dB on all
frequencies below 2300 MHz and on all frequencies above 2370 MHz; and
not less than 43 + 10 log (p) dB on all frequencies between 2300 and
2320 MHz and on all frequencies between 2345 and 2370 MHz that are
outside the licensed bands of operation;
(4) Compliance with these provisions is based on the use of
measurement instrumentation employing a resolution bandwidth of 1 MHz or
less, but at least one percent of the emission bandwidth of the
fundamental emission of the transmitter, provided the measured energy is
integrated over a 1 MHz bandwidth;
(5) In complying with the requirements in Sec. 27.53(a)(1) and
Sec. 27.53(a)(2), WCS equipment that uses opposite sense circular
polarization from that used by Satellite DARS systems in the 2320-2345
MHz band shall be permitted an allowance of 10 dB;
(6) When measuring the emission limits, the nominal carrier
frequency shall be adjusted as close to the edges, both upper and lower,
of the licensee's bands of operation as the design permits;
(7) The measurements of emission power can be expressed in peak or
average values, provided they are expressed in the same parameters as
the transmitter power;
(8) Waiver requests of any of the out-of-band emission limits in
paragraphs (a)(1) through (a)(7) of this section shall be entertained
only if interference protection equivalent to that afforded by the
limits is shown;
(9) In the 2305-2315 MHz band, if portable devices comply with all
of the following requirements, then paragraph (a)(2) of this section
shall not apply to portable devices, which instead shall attenuate all
emissions into the 2320-2345 MHz band by a factor of not less than 93 +
10 log (p) dB:
(i) The portable device has a duty cycle of 12.5% or less, with at
most a 312.5 microsecond pulse every 2.5 milliseconds;
(ii) The portable device must employ time division multiple access
(TDMA) technology;
(iii) The nominal peak transmit output power of the portable device
is no more than 200 milliwatts (25 milliwatts average power);
(iv) The portable device operates with the minimum power necessary
for successful communications;
(v) The nominal average base station transmit output power is no
more than 800 milliwatts when the base station antennas is located at a
height of at least 8 meters (26.25 feet) above the ground;
(vi) Only fixed and portable devices and services may be provided:
vehicle-mounted units are not permitted; and
(vii) Transmitting antennas shall employ linear polarization or
another polarization that provides equivalent of better discrimination
with respect to a DARS antenna;
(10) The out-of-band emissions limits in paragraphs (a)(1) through
(a)(9) of this section may be modified by the private contractual
agreement of all affected licensees, who shall maintain a copy of the
agreement in their station files and disclose it to prospective
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assignees or transferees and, upon request, to the Commission.
(b) For WCS Satellite DARS operations: The limits set forth in Sec.
25.202(f) of this chapter shall apply, except that Satellite DARS
operations shall be limited to a maximum power flux density of -197 dBW/
m2/4 kHz in the 2370-2390 MHz band at Arecibo, Puerto Rico.
(c) For operations in the 747 to 762 MHz band and the 777 to 792 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 outside the 747 to 762 MHz band, the power of
any emission shall be attenuated outside the band below the transmitter
power (P) by at least 43 + 10 log (P) dB;
(2) On any frequency outside the 777 to 792 MHz band, the power of
any emission shall be attenuated outside the band below the transmitter
power (P) by at least 43 + 10 log (P) dB;
(3) On all frequencies between 764 to 776 MHz and 794 to 806 MHz, by
a factor not less than 76 + 10 log (P) dB in a 6.25 kHz band segment,
for base and fixed stations;
(4) On all frequencies between 764 to 776 MHz and 794 to 806 MHz, by
a factor not less than 65 + 10 log (P) dB in a 6.25 kHz band segment,
for mobile and portable stations;
(5) Compliance with the provisions of paragraphs (c)(1) and (c)(2)
of this section is based on the use of measurement instrumentation
employing a resolution bandwidth of 100 kHz or greater. However, in the
100 kHz bands immediately outside and adjacent to the frequency block, a
resolution bandwidth of at least 30 kHz may be employed;
(6) Compliance with the provisions of paragraphs (c)(3) and (c)(4)
of this section is based on the use of measurement instrumentation such
that the reading taken with any resolution bandwidth setting should be
adjusted to indicate spectral energy in a 6.25 kHz segment.
(d) For operations in the 746-747 MHz, 762-764 MHz, 776-777 MHz, and
792-794 MHz bands, transmitters must meet the following emission
limitations:
(1) The adjacent channel power (ACP) requirements for transmitters
designed for various channel sizes are shown in the following tables.
Mobile station requirements apply to handheld, car mounted and control
station units. The tables specify a value for the ACP as a function of
the displacement from the channel center frequency and measurement
bandwidth. In the following tables, ``(s)'' indicates a swept
measurement may be used.
6.25 kHz Mobile Transmitter ACP Requirements
------------------------------------------------------------------------
Measurement
Offset from center frequency (kHz) bandwidth Maximum ACP
(kHz) (dBc)
------------------------------------------------------------------------
6.25 6.25 -40
12.5 6.25 -60
18.75 6.25 -60
25.00 6.25 -65
37.50 25.00 -65
62.50 25.00 -65
87.50 25.00 -65
150.00 100.00 -65
250.00 100.00 -65
350.00 100.00 -65
400 kHz to 12 MHz 30(s) -75
12 MHz to paired receive band 30(s) -75
In the paired receive band 30(s) -100
------------------------------------------------------------------------
12.5 kHz Mobile Transmitter ACP Requirements
------------------------------------------------------------------------
Measurement
Offset from center frequency (kHz) bandwidth Maximum ACP
(kHz) (dBc)
------------------------------------------------------------------------
9.375 6.25 -40
15.625 6.25 -60
21.875 6.25 -60
37.50 25.00 -60
62.50 25.00 -65
87.50 25.00 -65
150.00 100 -65
250.00 100 -65
350.00 100 -65
400 to 12 MHz 30(s) -75
12 MHz to paired receive band 30(s) -75
In the paired receive band 30(s) -100
------------------------------------------------------------------------
25 kHz Mobile Transmitter ACP Requirements
------------------------------------------------------------------------
Measurement
Offset from center frequency (kHz) bandwidth Maximum ACP
(kHz) (dBc)
------------------------------------------------------------------------
15.625 6.25 -40
21.875 6.25 -60
37.50 25 -60
62.50 25 -65
87.50 25 -65
[[Page 305]]
150.00 100 -65
250.00 100 -65
350.00 100 -65
400 kHz to 12 MHz 30(s) -75
12 MHz to paired receive band 30(s) -75
In the paired receive band 30(s) -100
------------------------------------------------------------------------
150 kHz Mobile Transmitter ACP Requirements
------------------------------------------------------------------------
Measurement
Offset from center frequency (kHz) bandwidth Maximum ACP
(kHz) relative (dBc)
------------------------------------------------------------------------
100 50 -40
200 50 -50
300 50 -50
400 50 -50
600-1000 30(s) -60
1000 to receive band 30(s) -70
In the receive band 30(s) -100
------------------------------------------------------------------------
6.25 kHz Base Transmitter ACP Requirements
------------------------------------------------------------------------
Measurement
Offset from center frequency (kHz) bandwidth Maximum ACP
(kHz) (dBc)
------------------------------------------------------------------------
6.25 6.25 -40
12.50 6.25 -60
18.75 6.25 -60
25.00 6.25 -65
37.50 25 -65
62.50 25 -65
87.50 25 -65
150.00 100 -65
250.00 100 -65
350.00 100 -65
400 kHz to 12 MHz 30(s) -80
12 MHz to paired receive band 30(s) -80
In the paired receive band 30(s) -100
------------------------------------------------------------------------
12.5 kHz Base Transmitter ACP Requirements
------------------------------------------------------------------------
Measurement
Offset from center frequency (kHz) bandwidth Maximum ACP
(kHz) (dBc)
------------------------------------------------------------------------
9.375 6.25 -40
15.625 6.25 -60
21.875 6.25 -60
37.5 25 -60
62.5 25 -65
87.5 25 -65
150 100 -65
250 100 -65
350.00 100 -65
400 kHz to 12 MHz 30(s) -80
12 MHz to paired receive band 30(s) -80
In the paired receive band 30(s) -100
------------------------------------------------------------------------
25 kHz Base Transmitter ACP Requirements
------------------------------------------------------------------------
Measurement
Offset from center frequency (kHz) bandwidth Maximum ACP
(kHz) (dBc)
------------------------------------------------------------------------
15.625 6.25 -40
21.875 6.25 -60
37.5 25 -60
62.5 25 -65
87.5 25 -65
150 100 -65
250 100 -65
350 100.00 -65
400 kHz to 12 MHz 30(s) -80
12 MHz to paired receive band 30(s) -80
In the paired receive band 30(s) -100
------------------------------------------------------------------------
150 kHz Base Transmitter ACP Requirements
------------------------------------------------------------------------
Measurement
Offset from center bandwidth Maximum ACP (dBc)
frequency (kHz) (kHz)
------------------------------------------------------------------------
100 50 -40
200 50 -50
300 50 -55
400 50 -60
600-1000 30(s) -65
1000 to receive band 30(s) -75 (continues at -6dB/oct
In the receive band 30(s) -100
------------------------------------------------------------------------
(2) ACP measurement procedure. The following procedures are to be
followed for making ACP transmitter measurements. For time division
multiple access (TDMA) systems, the measurements are to be made under
TDMA operation only during time slots when the transmitter is on. All
measurements must be made at the input to the transmitter's antenna.
Measurement bandwidth used below implies an instrument that measures the
power in many narrow bandwidths (e.g., 300 Hz) and integrates these
powers across a larger band to determine power in the measurement
bandwidth.
(i) Setting reference level. Using a spectrum analyzer capable of
ACP measurements, set the measurement bandwidth to the channel size. For
example, for a 6.25 kHz transmitter, set the measurement bandwidth to
6.25 kHz; for a 150 kHz transmitter, set the measurement bandwidth to
150 kHz. Set the frequency offset of the measurement bandwidth to zero
and adjust the center frequency of the spectrum analyzer to give the
power level in the measurement bandwidth. Record this power
[[Page 306]]
level in dBm as the ``reference power level''.
(ii) Non-swept power measurement. Using a spectrum analyzer capable
of ACP measurements, set the measurement bandwidth as shown in the
tables above. Measure the ACP in dBm. These measurements should be made
at maximum power. Calculate the coupled power by subtracting the
measurements made in this step from the reference power measured in the
previous step. The absolute ACP values must be less than the values
given in the table for each condition above.
(iii) Swept power measurement. Set a spectrum analyzer to 30 kHz
resolution bandwidth, 1 MHz video bandwidth and sample mode detection.
Sweep MHz from the carrier frequency. Set the
reference level to the RMS value of the transmitter power and note the
absolute power. The response at frequencies greater than 600 kHz must be
less than the values in the tables above.
(3) Out-of-band emission limit. On any frequency outside of the
frequency ranges covered by the ACP tables in this section, the power of
any emission must be reduced below the unmodulated carrier power (P) by
at least 43 + 10 log (P) dB.
(4) Authorized bandwidth. Provided that the ACP requirements of this
section are met, applicants may request any authorized bandwidth that
does not exceed the channel size.
(e) For operations in the 746-764 MHz and 776-794 MHz bands,
emissions in the band 1559-1610 MHz shall be limited to -70 dBW/MHz
equivalent isotropically radiated power (EIRP) for wideband signals, and
-80 dBW EIRP for discrete emissions of less than 700 Hz bandwidth. For
the purpose of equipment authorization, a transmitter shall be tested
with an antenna that is representative of the type that will be used
with the equipment in normal operation.
(f) For operations in the 698-746 MHz band, the power of any
emission outside a 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, by at least 43 + 10 log (P) dB.
Compliance with this provision is based on the use of measurement
instrumentation employing a resolution bandwidth of 100 kilohertz or
greater. However, in the 100 kilohertz bands immediately outside and
adjacent to a licensee's frequency block, a resolution bandwidth of at
least 30 kHz may be employed.
(g) For operations in the 1710-1755 MHz and 2110-2155 MHz bands, the
power of any emission outside a licensee's frequency block shall be
attenuated below the transmitter power (P) by at least 43 + 10
log10 (P) dB.
(1) Compliance with this provision is based on the use of
measurement instrumentation employing a resolution bandwidth of 1
megahertz or greater. However, in the 1 megahertz bands immediately
outside and adjacent to the licensee's frequency block, a resolution
bandwidth of at least one percent of the emission bandwidth of the
fundamental emission of the transmitter may be employed. The emission
bandwidth is defined as the width of the signal between two points, one
below the carrier center frequency and one above the carrier center
frequency, outside of which all emissions are attenuated at least 26 dB
below the transmitter power.
(2) When measuring the emission limits, the nominal carrier
frequency shall be adjusted as close to the licensee's frequency block
edges, both upper and lower, as the design permits.
(3) The measurements of emission power can be expressed in peak or
average values, provided they are expressed in the same parameters as
the transmitter power.
(h) When an emission outside of the authorized bandwidth causes
harmful interference, the Commission may, at its discretion, require
greater attenuation than specified in this section.
(i) For operations in the unpaired 1390-1392 MHz band and the paired
1392-1395 MHz and 1432-1435 MHz bands, the power of any emission outside
the licensee's frequency band(s) of operation shall be attenuated below
the transmitter power (P) by at least 43 + 10 log (P) dB. Compliance
with these provisions is based on the procedures described in paragraph
(a)(4) of this section.
(j) For operations in the 1670-1675 MHz band, the power of any
emission
[[Page 307]]
outside the licensee's frequency band(s) of operation shall be
attenuated below the transmitter power (P) by at least 43 + 10 log (P)
dB. Compliance with these provisions is based on the procedures
described in paragraph (a)(4) of this section.
(k) [Reserved]
(l) For BRS and EBS stations, the power of any emissions outside the
licensee's frequency bands of operation shall be attenuated below the
transmitter power (P) measured in watts.
(1) Prior to the transition, and thereafter, solely within the MBS,
for analog operations with an EIRP in excess of -9 dBW, the signal shall
be attenuated at the channel edges by at least 38 dB relative to the
peak visual carrier, then linearly sloping from that level to at least
60 dB of attenuation at 1 MHz below the lower band edge and 0.5 MHz
above the upper band edge, and attenuated at least 60 dB at all other
frequencies.
(2) For fixed and temporary fixed digital stations, the attenuation
shall be not less than 43 + 10 log (P) dB, unless a documented
interference complaint is received from an adjacent channel licensee.
Provided that the complaint cannot be mutually resolved between the
parties, both licensees of existing and new systems shall reduce their
out-of-band emissions by at least 67 + 10 log (P) dB measured at 3 MHz
from their channel's edges for distances between stations exceeding 1.5
km. For stations separated by less than 1.5 km, the new licensee shall
reduce attenuation at least 67 + 10 log (P) - 20 log(Dkm/
1.5), or when colocated, limit the undesired signal level at the
affected licensee's base station receiver(s) at the colocation site to
no more than -107 dBm. Mobile Service Satellite licensees operating on
frequencies below 2495 MHz may also submit a documented interference
complaint against BRS licensees operating on channel BRS1 on the same
terms and conditions as adjacent channel BRS or EBS licensees.
(3) Prior to transition and thereafter solely within the MBS, and
notwithstanding paragraph (l)(2) of this section, the maximum out-of-
band power of a digital transmitter operating on a single 6 MHz channel
with an EIRP in excess of -9 dBW employing digital modulation for the
primary purpose of transmitting video programming shall be attenuated at
the 6 MHz channel edges at least 25 dB relative to the licensed average
6 MHz channel power level, then attenuated along a linear slope to at
least 40 dB at 250 kHz beyond the nearest channel edge, then attenuated
along a linear slope from that level to at least 60 dB at 3 MHz above
the upper and below the lower licensed channel edges, and attenuated at
least 60 dB at all other frequencies.
(4) For mobile digital stations, the attenuation factor shall be not
less than 43 + 10 log (P) dB at the channel edge and 55 + 10 log (P) dB
at 5.5 MHz from the channel edges. Mobile Service Satellite licensees
operating on frequencies below 2495 MHz may also submit a documented
interference complaint against BRS licensees operating on channel BRS1
on the same terms and conditions as adjacent channel BRS or EBS
licensees.
(5) Notwithstanding the provisions of paragraphs (l)(2) and (l)(4)
of this section, prior to transition, a licensee may continue to operate
facilities deployed as of January 10, 2005 provided that such facilities
operate in compliance with the emission mask applicable to those
services prior to January 10, 2005.
(6) Measurement procedure. Compliance with these rules is based on
the use of measurement instrumentation employing a resolution bandwidth
of 1 MHz or greater. However, in the 1 MHz bands immediately outside and
adjacent to the frequency block a resolution bandwidth of at least one
percent of the emission bandwidth of the fundamental emission of the
transmitter may be employed. A narrower resolution bandwidth is
permitted in all cases to improve measurement accuracy provided the
measured power is integrated over the full required measurement
bandwidth (i.e. 1 MHz or 1 percent of emission bandwidth, as specified).
The emission bandwidth is defined as the width of the signal between two
points, one below the carrier center frequency and one above the carrier
center frequency, outside of which all emissions are attenuated at least
26 dB below the transmitter
[[Page 308]]
power. With respect to television operations, measurements must be made
of the separate visual and aural operating powers at sufficiently
frequent intervals to ensure compliance with the rules.
(7) Alternative out of band emission limit. Licensees in this
service may establish an alternative out of band emission limit to be
used at specified band edge(s) in specified geographical areas, in lieu
of that set forth in this section, pursuant to a private contractual
arrangement of all affected licensees and applicants. In this event,
each party to such contract shall maintain a copy of the contract in
their station files and disclose it to prospective assignees or
transferees and, upon request, to the FCC.
(m) When an emission outside of the authorized bandwidth causes
harmful interference, the Commission may, at its discretion, require
greater attenuation than specified in this section.
[62 FR 16497, Apr. 7, 1997, as amended at 65 FR 3147, Jan. 20, 2000; 65
FR 17602, Apr. 4, 2000; 65 FR 42883, July 12, 2000; 67 FR 5511, Feb. 6,
2002; 67 FR 41855, June 20, 2002; 69 FR 5715, Feb. 6, 2004; 69 FR 72033,
Dec. 10, 2004; 69 FR 77950, Dec. 29, 2004; 70 FR 1190, Jan. 6, 2005; 70
FR 21664, Apr. 27, 2005]