§ 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, 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.

   [ 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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