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)
------------------------------------------------------------------------
3.7-4.2 \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.

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\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.

    (2) The following frequencies are available for use by the 
Radiodetermination Satellite Service:

1610-1626.5 MHz: User-to-Satellite Link
2483.5-2500 MHz: Satellite-to-User Link


Fixed-Satellite service frequencies may be used for links between 
radiodetermination satellites and control centers, including the 
following designated bands, subject to the Rules in this subpart:

5150-5216 MHz: Satellite-to-Control Center Link
6525-6541.5 MHz: Control Center-to-Satellite Link

    (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.

    (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

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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]