Sec.  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\
3.7-4.2 \1\                          5.925-6.425 \1\
10.7-10.95 \1,12\                    12.75-13.25 \1,12,14\
10.95-11.2 \1,2,12\                  13.75-14 \4,12\
11.2-11.45 \1,12\                    14-14.2 \5\
11.45-11.7 \1,2,12\                  14.2-14.5
11.7-12.2 \3\                        17.3-17.8 \9\
12.2-12.7 \13\                       27.5-29.5 \1\
18.3-18.58 \1,10\                    29.5-30
18.58-18.8 \6,10,11\                 \1\ 47.2-50.2
18.8-19.3 \7,10\
19.3-19.7 \8,10\
19.7-20.2 \10\
37.5-40 \15,16\
37.6-38.6
40-42 \16\
------------------------------------------------------------------------
\1\ This band is shared coequally with terrestrial radiocommunication
  services.
\2\ Use 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.
\3\ Fixed-satellite transponders may be used additionally for
  transmissions in the broadcasting-satellite service.
\4\ This band is shared on an equal basis with the Government
  radiolocation service and grandfathered space stations in the Tracking
  and Data Relay Satellite System.
\5\ In this band, stations in the radionavigation service shall operate
  on a secondary basis to the fixed-satellite service.
\6\ The band 18.58-18.8 GHz is shared co-equally with existing
  terrestrial radiocommunication systems until June 8, 2010.
\7\ The band 18.8-19.3 GHz is shared co-equally with terrestrial
  radiocommunication services, until June 8, 2010. After this date, the
  sub-band 19.26-19.3 GHz is shared co-equally with existing terrestrial
  radiocommunication systems.
\8\ The 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.
\9\ The 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 co-equally with
  terrestrial fixed services.
\10\ This band is shared co-equally with the Federal Government fixed-
  satellite service.
\11\ The band 18.6-18.8 GHz is shared co-equally with the non-Federal
  Government and Federal Government Earth exploration-satellite
  (passive) and space research (passive) services.
\12\ Use of this band by non-geostationary satellite orbit systems in
  the fixed-satellite service is limited to gateway earth station
  operations.
\13\ Use of this band by the fixed-satellite service is limited to non-
  geostationary satellite orbit systems.
\14\ Use of this band by NGSO FSS gateway earth station uplink
  operations is subject to the provisions of  Sec.  2.106 NG53.
\15\ Use 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.
\16\ The 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.
\17\ FSS earth stations in this band must operate on a secondary basis
  to terrestrial radiocommunication services, except that the band is
  shared co-equally between certain grandfathered earth stations and the
  terrestrial radiocommunication services.

   (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  Sec.  Sec. 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.

   (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
    Sec. 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, as amended at  36 FR 2562 , Feb. 6, 1971;  38 FR 8573 , Apr. 4, 1973;  39 FR 33527 , Sept. 18, 1974;  48 FR 40254 , Sept. 6, 1983;
    50 FR 36079 , Sept. 5, 1985;  51 FR 18445 , May 20, 1986;  51 FR 20975 , June 10,
   1986;  54 FR 49993 , Dec. 4, 1989;  56 FR 24024 , May 28, 1991;  58 FR 13419 ,
   Mar. 11, 1993;  58 FR 68061 , Dec. 23, 1993;  59 FR 53329 , Oct. 21, 1994;  61 FR 9952 , Mar. 12, 1996;  61 FR 52307 , Oct. 7, 1996;  62 FR 11105 , Mar. 11, 1997;
    64 FR 2591 , Jan. 15, 1999;  64 FR 6565 , Feb. 10. 1999;  65 FR 54171 , Sept. 7,
   2000;  65 FR 59144 , Oct. 4, 2000;  66 FR 10622 , Feb. 16, 2001;  66 FR 63515 ,
   Dec. 7, 2001;  67 FR 17299 , Apr. 10, 2002;  67 FR 39862 , June 11, 2002;  67 FR 51114 , Aug. 7, 2002;  68 FR 11993 , Mar. 13, 2003;  68 FR 16966 , Apr. 8, 2003;
    68 FR 34338 , June 9, 2003;  68 FR 74387 , Dec. 23, 2003;  69 FR 52206 , Aug. 25,
   2004;  70 FR 4783 , Jan. 31, 2005;  70 FR 24725 , May 11, 2005;  70 FR 32255 ,
   June 2, 2005]