Goto Section: 27.52 | 27.54 | Table of Contents

FCC 27.53
Revised as of October 1, 2005
Goto Year:2004 | 2006
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 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/m^2/4 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
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 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 log[10] (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
   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(D[km]/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 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]


Goto Section: 27.52 | 27.54

Goto Year: 2004 | 2006
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