Goto Section: 27.52 | 27.54 | Table of Contents

FCC 27.53
Revised as of October 1, 2008
Goto Year:2007 | 2009
  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 746–758 MHz band and the 776–788 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 746–758 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 776–788 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 763–775 MHz and 793–805 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 763–775 MHz and 793–805 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 758–763 MHz and 788–793 MHz bands, the power of
   any emission outside the licensee's frequency bands 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 all frequencies between 769–775 MHz and 799–805 MHz, by a factor not
   less than 76 + 10 log (P) dB in a 6.25 kHz band segment, for base and fixed
   stations;

   (2) On all frequencies between 769–775 MHz and 799–805 MHz, by a factor not
   less than 65 + 10 log (P) dB in a 6.25 kHz band segment, for mobile and
   portable stations;

   (3) On any frequency between 775–788 MHz, above 805 MHz, and below 758 MHz,
   by at least 43 + 10 log (P) dB;

   (4) Compliance with the provisions of paragraphs (d)(1) and (d)(2) 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;

   (5) Compliance with the provisions of paragraph (d)(3) 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.

   (e) For operations in the 775–776 MHz and 805–806 MHz bands, transmitters
   must comply with either paragraphs (e)(1) to (e)(5) of this section or the
   ACP emission limitations set forth in paragraphs (e)(6) to (e)(9) of this
   section.

   (1) On all frequencies between 763–775 MHz and 793–805 MHz, the power of any
   emission  outside the licensee's frequency bands of operation shall be
   attenuated below the transmitter power (P) within the licensed band(s) of
   operation, measured in watts, by a factor not less than 76 + 10 log (P) dB
   in a 6.25 kHz band segment, for base and fixed stations;

   (2) On all frequencies between 763–775 MHz and 793–805 MHz, the power of any
   emission  outside the licensee's frequency bands of operation shall be
   attenuated below the transmitter power (P) within the licensed band(s) of
   operation, measured in watts, by a factor not less than 65 + 10 log (P) dB
   in a 6.25 kHz band segment, for mobile and portable stations;

   (3) On any frequency outside the 775–776 MHz and 805–806 MHz bands, the
   power  of  any emission shall be attenuated outside the band below the
   transmitter power (P) within the licensed band(s) of operation, measured in
   watts, by at least 43 + 10 log (P) dB;

   (4) Compliance with the provisions of paragraphs (e)(1) and (e)(2) 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;

   (5) Compliance with the provisions of paragraph (e)(3) 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) 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
   Offset from center
   frequency
   (kHz) Measurement bandwidth
   (kHz) Maximum ACP
   (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
   Offset from center
   frequency
   (kHz) Measurement bandwidth
   (kHz) Maximum ACP
   (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
   Offset from center
   frequency
   (kHz) Measurement bandwidth
   (kHz) Maximum ACP
   (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
   Offset from center
   frequency
   (kHz) Measurement bandwidth
   (kHz) Maximum ACP 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
   Offset from center
   frequency
   (kHz) Measurement bandwidth
   (kHz) Maximum ACP
   (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
   Offset from center
   frequency
   (kHz) Measurement bandwidth
   (kHz) Maximum ACP
   (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
   Offset from center
   frequency
   (kHz) Measurement bandwidth
   (kHz) Maximum ACP
   (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
   Offset from center
   frequency
   (kHz) Measurement bandwidth
   (kHz) Maximum ACP
   (dBc)
         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

   (7) 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.

   (8) 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.

   (9) 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.

   (f) For operations in the 746–763 MHz, 775–793 MHz, and 805–806 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.

   (g)  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.

   (h) 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.

   (i) 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.

   (j)  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.

   (k) 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.

   (l) [Reserved]

   (m)  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 in accordance with the standards
   below. If a licensee has multiple contiguous channels, out-of-band emissions
   shall be measured from the upper and lower edges of the contiguous channels.

   (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 digital base 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 with an overlapping Geographic Service Area.
   Mobile Satellite Service licensees operating on frequencies below 2495 MHz
   may also submit a documented interference complaint against BRS licensees
   operating on channel BRS No. 1 on the same terms and conditions as adjacent
   channel  BRS or EBS licensees. Provided that a documented interference
   complaint cannot be mutually resolved between the parties prior to the
   applicable deadline, then the following additional attenuation requirements
   shall apply:

   (i)  If  a pre-existing base station suffers harmful interference from
   emissions caused by a new or modified base station located 1.5 km or more
   away, within 24 hours of the receipt of a documented interference complaint
   the  licensee  of  the new or modified base station must attenuate its
   emissions by at least 67 + 10 log (P) dB measured at 3 megahertz, above or
   below, from the channel edge of its frequency block and shall immediately
   notify  the complaining licensee upon implementation of the additional
   attenuation.  No  later  than 60 days after the implementation of such
   additional attenuation, the licensee of the complaining base station must
   attenuate its base station emissions by at least 67 + 10 log (P) dB measured
   at 3 megahertz, above or below, from the channel edge of its frequency block
   of the new or modified base station.

   (ii)  If a pre-existing base station suffers harmful interference from
   emissions caused by a new or modified base station located less than 1.5 km
   away, within 24 hours of receipt of a documented interference complaint the
   licensee of the new or modified base station must attenuate its emissions by
   at least 67 + 10 log (P)−20 log (Dkm/1.5) dB measured at 3 megahertz, above
   or below, from the channel edge of its frequency block of the complaining
   licensee, or if both base stations are co-located, limit its undesired
   signal level at the pre-existing base station receiver(s) to no more than
   −107 dBm measured in a 5.5 megahertz bandwidth and shall immediately notify
   the complaining licensee upon such reduction in the undesired signal level.
   No later than 60 days after such reduction in the undesired signal level,
   the complaining licensee must attenuate its base station emissions by at
   least 67 + 10 log (P) dB measured at 3 megahertz, above or below, from the
   channel edge of its frequency block of the new or modified base station.

   (iii) If a new or modified base station suffers harmful interference from
   emissions caused by a pre-existing base station located 1.5 km or more away,
   within  60  days of receipt of a documented interference complaint the
   licensee of each base station must attenuate its base station emissions by
   at least 67 + 10 log (P) dB measured at 3 megahertz, above or below, from
   the channel edge of its frequency block of the other licensee.

   (iv) If a new or modified base station suffers harmful interference from
   emissions caused by a pre-existing base station located less than 1.5 km
   away, within 60 days of receipt of a documented interference complaint: (a)
   The licensee of the new or modified base station must attenuate its OOBE by
   at least 67 + 10 log (P)−20 log (Dkm/1.5) measured 3 megahertz above or
   below, from the channel edge of its frequency block of the other licensee,
   or if the base stations are co-located, limit its undesired signal level at
   the other base station receiver(s) to no more than −107 dBm measured in a
   5.5-megahertz bandwidth; and (b) the licensee causing the interference must
   attenuate  its  emissions by at least 67 + 10 log (P) dB measured at 3
   megahertz, above or below, from the channel edge of its frequency block of
   the new or modified base station.

   (v) For all fixed digital user stations, the attenuation factor shall be not
   less than 43 + 10 log (P) dB at the channel edge.

   (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
   megahertz  from  the channel edges. Mobile Satellite Service licensees
   operating  on  frequencies below 2495 MHz may also submit a documented
   interference complaint against BRS licensees operating on BRS Channel 1 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.

   (n) 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;  71 FR 35190 , June 19, 2006;  72 FR 48851 , Aug. 24, 2007;  73 FR 26039 , May 8, 2008]


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