§ 25.202   Frequencies, frequency tolerance, and emission limits.

   (a)(1) Frequency band. The following frequencies are available for use by
   the Fixed-Satellite Service. Precise frequencies and bandwidths of emission
   shall  be assigned on a case-by-case basis. Refer to the U.S. Table of
   Frequency Allocations, 47 CFR 2.106, including relevant footnotes, for
   band-specific use restrictions and coordination requirements. Restrictions
   and  coordination  conditions  not mentioned in the Table of Frequency
   Allocations are set forth in the annotations to the following list:
   Space-to-earth (GHz) Earth-to-space (GHz)
   3.6-3.65             5.091-5.25
   3.65-3.7             5.85-5.925
   3.7-4.2              5.925-6.425
   4.5-4.8              6.425-6.525
   6.7-7.025            6.525-6.7
   7.025-7.075          6.7-7.025
   10.7-11.7            7.025-7.075
   11.7-12.2            12.7-12.75
   12.2-12.7            12.75-13.25
   18.3-18.58^1 2       13.75-14
   18.58-18.8           14-14.2
   18.8-19.3            14.2-14.5
   19.3-19.7            15.43-15.63
   19.7-20.2            17.3-17.8
   37.5-40^3            24.75-25.05
   40-42                25.05-25.25
                        ^227.5-28.35
                        ^428.35-28.6
                        ^528.6-29.1
                        ^629.1-29.25
                        ^729.25-29.5
                        ^429.5-30.0
                        47.2-50.2

   ^1The 18.3-18.58 GHz band is shared co-equally with existing terrestrial
   radiocommunication systems until November 19, 2012.

   ^2FSS is secondary to LMDS in this band.

   ^3Use of this band by the Fixed-Satellite Service is limited to gateway
   earth station operations, provided the licensee under this part obtains a
   license under part 101 of this chapter or an agreement from a part 101
   licensee for the area in which an earth station is to be located. Satellite
   earth station facilities in this band may not be ubiquitously deployed and
   may not be used to serve individual consumers.

   ^4This band is primary for GSO FSS and secondary for NGSO FSS.

   ^5This band is primary for NGSO FSS and secondary for GSO FSS.

   ^6This band is primary for MSS feeder links and LMDS hub-to-subscriber
   transmission.

   ^7This band is primary for MSS feeder links and GSO FSS.

   (2) [Reserved]

   (3)  The following frequencies are available for use by the non-voice,
   non-geostationary mobile-satellite service:

   137-138 MHz: Space-to-Earth

   148-150.05 MHz: Earth-to-space

   399.9-400.05 MHz: Earth-to-space

   400.15-401 MHz: Space-to-Earth

   (4)(i) The following frequencies are available for use by the 1.6/2.4 GHz
   Mobile-Satellite Service:

   1610-1626.5 MHz: User-to-Satellite Link

   1613.8-1626.5 MHz: Satellite-to-User Link (secondary)

   2483.5-2500 MHz: Satellite-to-User Link

   (ii)  The  following  frequencies  are  available for use by the 2 GHz
   Mobile-Satellite Service: 2000-2020 MHz: User-to-Satellite Link; 2180-2200
   MHz: Satellite-to-User Link.

   (iii)(A) The following frequencies are available for use by the 1.5/1.6 GHz
   Mobile-Satellite Service:

   1525-1559 MHz: space-to-Earth

   1626.5-1660.5 MHz: Earth-to-space

   (B)  The use of the frequencies 1544-1545 MHz and 1645.5-1646.5 MHz is
   limited to distress and safety communications.

   (5) The following frequencies are available for use by the inter-satellite
   service:

   22.55-23.00 GHz

   23.00-23.55 GHz

   24.45-24.65 GHz

   24.65-24.75 GHz

   54.25-56.90 GHz

   57.00-58.20 GHz

   65.00-71.00 GHz

   (6) The following frequencies are available for use by the Satellite Digital
   Audio Radio Service (SDARS), and for any associated terrestrial repeaters:
   2320-2345 MHz (space-to-Earth)

   (7) The following frequencies are available for use by the Direct Broadcast
   Satellite service:

   12.2-12.7 GHz: Space-to-Earth.

   12.2-12.7 GHz: Space-to-Earth.

   (8) The following frequencies are available for use by ESVs:

   3700-4200 MHz (space-to-Earth)

   5925-6425 MHz (Earth-to-space)

   10.95-11.2 GHz (space-to-Earth)

   11.45-11.7 GHz (space-to-Earth)

   11.7-12.2 GHz (space-to-Earth)

   14.0-14.5 GHz (Earth-to-space)

   ESVs  shall be authorized and coordinated as set forth in § § 25.221 and
   25.222. ESV operators, collectively, may coordinate up to 180 megahertz of
   spectrum in the 5925-6425 MHz (Earth-to-space) band for all ESV operations
   at any given location subject to coordination.

   (9)   The   following   frequencies  are  available  for  use  by  the
   Broadcasting-Satellite Service after 1 April 2007:

   17.3-17.7 GHz (space-to-Earth)

   17.7-17.8 GHz (space-to-Earth)

   Note  1  to  paragraph  (a)(9):  Use  of the 17.3-17.7 GHz band by the
   broadcasting-satellite service is limited to geostationary satellite orbit
   systems.

   Note 2 to paragraph (a)(9): Use of the 17.7-17.8 GHz band (space-to-Earth)
   by the broadcasting-satellite service is limited to transmissions from
   geostationary satellite orbit systems to receiving earth stations located
   outside of the United States and its Possessions. In the United States and
   its Possessions, the 17.7-17.8 GHz band is allocated on a primary basis to
   the Fixed Service.

   (10)(i) The following frequencies are available for use by Vehicle-Mounted
   Earth Stations (VMESs):

   10.95-11.2GHz (space-to-Earth)

   11.45-11.7GHz (space-to-Earth)

   11.7-12.2GHz (space-to-Earth)

   14.0-14.5GHz (Earth-to-space)

   (ii) VMESs shall be authorized as set forth in § 25.226.

   (11)(i) The following frequencies are available for use by Earth Stations
   Aboard Aircraft (ESAA):

   10.95-11.2 GHz (space-to-Earth)

   11.45-11.7 GHz (space-to-Earth)

   11.7-12.2 GHz (space-to-Earth)

   14.0-14.5 GHz (Earth-to-space)

   (ii) ESAAs shall be authorized as set forth in § 25.227.

   (b) Other frequencies and associated bandwidths of emission may be assigned
   on a case-by-case basis to space systems under this part in conformance with
   § 2.106 of this chapter and the Commission's rules and policies.

   (c) [Reserved]

   (d) Frequency tolerance, Earth stations. The carrier frequency of each earth
   station transmitter authorized in these services shall be maintained within
   0.001 percent of the reference frequency.

   (e) Frequency tolerance, space stations. The carrier frequency of each space
   station transmitter authorized in these services shall be maintained within
   0.002 percent of the reference frequency.

   (f) Emission limitations. Except for SDARS terrestrial repeaters and as
   provided  for  in  paragraph (i), the mean power of emissions shall be
   attenuated below the mean output power of the transmitter in accordance with
   the schedule set forth in paragraphs (f)(1) through (f)(4) of this section.
   The out-of-band emissions of SDARS terrestrial repeaters shall be attenuated
   in accordance with the schedule set forth in paragraph (h) of this section.

   (1) In any 4 kHz band, the center frequency of which is removed from the
   assigned frequency by more than 50 percent up to and including 100 percent
   of the authorized bandwidth: 25 dB;

   (2) In any 4 kHz band, the center frequency of which is removed from the
   assigned frequency by more than 100 percent up to and including 250 percent
   of the authorized bandwidth: 35 dB;

   (3) In any 4 kHz band, the center frequency of which is removed from the
   assigned frequency by more than 250 percent of the authorized bandwidth: An
   amount equal to 43 dB plus 10 times the logarithm (to the base 10) of the
   transmitter power in watts;

   (4) In any event, when an emission outside of the authorized bandwidth
   causes harmful interference, the Commission may, at its discretion, require
   greater attenuation than specified in paragraphs (f) (1), (2) and (3) of
   this section.

   (g) Telemetry, tracking and command functions must be conducted at either or
   both edges of the allocated band(s). Frequencies, polarization and coding
   shall be selected to minimize interference into other satellite networks and
   within their own satellite system.

   (h) Out-of-band emission limitations for SDARS terrestrial repeaters. (1)
   Any SDARS terrestrial repeater operating at a power level greater than
   2-watt average EIRP is required to attenuate its out-of-band emissions below
   the transmitter power P by a factor of not less than 90 + 10 log (P) dB in a
   1-megahertz bandwidth outside the 2320-2345 MHz band, where P is average
   transmitter output power in watts.

   (2) Any SDARS terrestrial repeater operating at a power level equal to or
   less than 2-watt average EIRP is required to attenuate its out-of-band
   emissions below the transmitter power P by a factor of not less than 75 + 10
   log (P) dB in a 1-megahertz bandwidth outside the 2320-2345 MHz band, where
   P is average transmitter output power in watts.

   (3) SDARS repeaters are permitted to attenuate out-of-band emissions less
   than the levels specified in paragraphs (h)(1) and (h)(2), of this section
   unless a potentially affected WCS licensee provides written notice that it
   intends  to commence commercial service within the following 365 days.
   Starting 180 days after receipt of such written notice, SDARS repeaters
   within the area notified by the potentially affected WCS licensee must
   attenuate out-of-band emissions to the levels specified in paragraphs (h)(1)
   and (h)(2) of this section.

   (4) For the purpose of this section, a WCS licensee is potentially affected
   if  it is authorized to operate a base station in the 2305-2315 MHz or
   2350-2360 MHz bands within 25 kilometers of a repeater seeking to operate
   with an out of band emission attenuation factor less than those prescribed
   in paragraphs (h)(1) or (2) of this section.

   (i)  The  WCS  licensee is authorized to operate a base station in the
   2305-2315 MHz or 2350-2360 MHz bands in the same Major Economic Area (MEA)
   as that in which a SDARS terrestrial repeater is located.

   (ii)  The  WCS licensee is authorized to operate a base station in the
   2315-2320 MHz or 2345-2350 MHz bands in the same Regional Economic Area
   Grouping (REAG) as that in which a SDARS terrestrial repeater is located.

   (iii) A SDARS terrestrial repeater is located within 5 kilometers of the
   boundary  of an MEA or REAG in which the WCS licensee is authorized to
   operate a WCS base station.

   (i) The following unwanted emissions power limits for non-geostationary
   satellites operating in the inter-satellite service that transmit in the
   22.55-23.55 GHz band shall apply in any 200 MHz of the 23.6-24 GHz passive
   band, based on the date that complete advance publication information is
   received by the ITU's Radiocommunication Bureau:

   (1) For information received before January 1, 2020: −36 dBW.

   (2) For information received on or after January 1, 2020: −46 dBW.

   (j) For earth stations in the Fixed-Satellite Service (Earth-to-space) that
   transmit in the 49.7-50.2 GHz and 50.4-50.9 GHz bands, the unwanted emission
   power in the 50.2-50.4 GHz band shall not exceed −20 dBW/200 MHz (measured
   at the input of the antenna), except that the maximum unwanted emission
   power may be increased to −10 dBW/200 MHz for earth stations having an
   antenna gain greater than or equal to 57 dBi. These limits apply under
   clear-sky conditions. During fading conditions, the limits may be exceeded
   by earth stations when using uplink power control.

   [ 30 FR 7176 , May 28, 1965]

   Editorial Note: For Federal Register citations affecting § 25.202, see the
   List of CFR Sections Affected, which appears in the Finding Aids section of
   the printed volume and at www.fdsys.gov.

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