§  25.202   Frequencies, frequency tolerance and emission limitations.

   (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. The Table follows:
   Space-to-earth
   (GHz) Earth-to-space
   (GHz)
         3.65–3.7^17        ^12^195.091–5.25
         3.7–4.2^1          ^15.925–6.425
         6.7–7.025^12       ^1^12^1412.75–13.25
         10.7–10.95^1 12    ^4^1213.75–14
         10.95–11.2^1 2 12  ^514–14.2
         11.2–11.45^1 12    14.2–14.5
         11.45–11.7^1 2 12  ^12^2015.43–15.63
         11.7–12.2^3        ^917.3–17.8
         12.2–12.7^13       ^1824.75–25.05
         18.3–18.58^1 10    ^1^1825.05–25.25
         18.58–18.8^6^10^11 ^127.5–29.5
         18.8–19.3^7 10     29.5–30
         19.3–19.7^8 10     ^147.2–50.2
         19.7–20.2^10
         37.5–40^15 16
         40–42^16

   ^1This band is shared coequally with terrestrial radiocommunication
   services.

   ^2Use of this band by geostationary satellite orbit satellite systems
   in the fixed-satellite service is limited to international systems;
   i.e. , other than domestic systems.

   ^3Fixed-satellite transponders may be used additionally for
   transmissions in the broadcasting-satellite service.

   ^4This band is shared on an equal basis with the Government
   radiolocation service and grandfathered space stations in the Tracking
   and Data Relay Satellite System.

   ^5In this band, stations in the radionavigation service shall operate
   on a secondary basis to the fixed-satellite service.

   ^6The band 18.58–18.8 GHz is shared coequally with existing terrestrial
   radiocommunication systems until June 8, 2010.

   ^7The band 18.8–19.3 GHz is shared coequally with terrestrial
   radiocommunication services, until June 8, 2010. After this date, the
   sub-band 19.26–19.3 GHz is shared coequally with existing terrestrial
   radiocommunication systems.

   ^8The use of the band 19.3–19.7 GHz by the fixed-satellite service
   (space-to-Earth) is limited to feeder links for the mobile-satellite
   service.

   ^9The use of the band 17.3–17.8 GHz by the fixed-satellite service
   (Earth-to-space) is limited to feeder links for broadcasting-satellite
   service, and the sub-band 17.7–17.8 GHz is shared coequally with
   terrestrial fixed services.

   ^10This band is shared coequally with the Federal Government
   fixed-satellite service.

   ^11The band 18.6–18.8 GHz is shared coequally with the non-Federal
   Government and Federal Government Earth exploration-satellite (passive)
   and space research (passive) services.

   ^12Use of this band by nongeostationary satellite orbit systems in the
   fixed-satellite service is limited to gateway earth station operations.

   ^13Use of this band by the fixed-satellite service is limited to
   nongeostationary satellite orbit systems.

   ^14Use of this band by NGSO FSS gateway earth station uplink operations
   is subject to the provisions of § 2.106 NG53.

   ^15Use 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.

   ^16The band 37.5–40.0 GHz is designated as being available for use by
   the fixed and mobile services and the band 40.0–42.0 GHz is designated
   as being available for use by the fixed-satellite service.

   ^17FSS earth stations in this band must operate on a secondary basis to
   terrestrial radiocommunication services, except that the band is shared
   coequally between certain grandfathered earth stations and the
   terrestrial radiocommunication services.

   ^18Use of the band 24.75–25.25 GHz by the fixed-satellite service
   (Earth-to-space) is limited to feeder links for space stations in the
   broadcasting-satellite service, and the sub-band 25.05–25.25 GHz is
   shared coequally with terrestrial fixed services.

   ^19See 47 CFR 2.106, footnotes 5.444A and US344, for conditions that
   apply to this band.

   ^20See 47 CFR 2.106, footnotes 5.511C and US359, for conditions that
   apply to this band.

   (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 L-band
   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

   (6) The following spectrum is available for exclusive use by the
   satellite digital audio radio service:

   2320–2345 MHz: space-to-Earth (primary).

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

   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.

   (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) Orbital locations assigned to space stations licensed under this
   part by the commission are subject to change by summary order of the
   Commission on 30 days notice. An authorization to construct and/or to
   launch a space station becomes null and void if the construction is not
   begun or is not completed, or if the space station is not launched and
   positioned at its assigned orbital location and operations commenced in
   accordance with the station authorization, by the respective date(s)
   specified in the authorization. Frequencies and orbital location
   assignments are subject to the policies set forth in the Report and
   Order, FCC 83–184, adopted April 27, 1983 in CC Docket No. 81–704 and
   the Report and Order, adopted July 25, 1985 in CC Docket No. 84–1299 as
   modified by the Report and Order, adopted January 19, 1996 in IB Docket
   No. 95–41.

   (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. The mean power of emissions shall be
   attenuated below the mean output power of the transmitter in accordance
   with the following schedule:

   (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 telecommand functions for U.S. domestic
   satellites shall 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.

   [ 30 FR 7176 , May 28, 1965]

   Editorial Note:   ForFederal Registercitations affecting § 25.202, see
   the List of CFR Sections Affected, which appears in the Finding Aids
   section of the printed volume and on GPO Access.