§  97.303   Frequency sharing requirements.

   The following paragraphs summarize the frequency sharing requirements
   that apply to amateur stations transmitting in the frequency bands
   specified in § 97.301 of this part. Each frequency band allocated to
   the amateur service is designated as either a secondary service or a
   primary service. A station in a secondary service must not cause
   harmful interference to, and must accept interference from, stations in
   a primary service.

   (a) Where, in adjacent ITU Regions or sub-Regions, a band of
   frequencies is allocated to different services of the same category (
   i.e., primary or secondary services), the basic principle is the
   equality of right to operate. Accordingly, stations of each service in
   one Region or sub-Region must operate so as not to cause harmful
   interference to any service of the same or higher category in the other
   Regions or sub-Regions.

   (b) Amateur stations transmitting in the 70 cm band, the 33 cm band,
   the 23 cm band, the 9 cm band, the 5 cm band, the 3 cm band, or the
   24.05-24.25 GHz segment must not cause harmful interference to, and
   must accept interference from, stations authorized by the United States
   Government in the radiolocation service.

   (c) Amateur stations transmitting in the 1900-2000 kHz segment, the
   76-77.5 GHz segment, the 78-81 GHz segment, the 136-141 GHz segment, or
   the 241-248 GHz segment must not cause harmful interference to, and
   must accept interference from, stations authorized by the United States
   Government, the FCC, or other nations in the radiolocation service.

   (d) Amateur stations transmitting in the 430-450 MHz segment, the 23 cm
   band, the 3.3-3.4 GHz segment, the 5.65-5.85 GHz segment, the 13 cm
   band, or the 24.05-24.25 GHz segment, must not cause harmful
   interference to, and must accept interference from, stations authorized
   by other nations in the radiolocation service.

   (e) Amateur stations receiving in the 33 cm band, the 2400-2450 MHz
   segment, the 5.725-5.875 GHz segment, the 1.2 cm band, the 2.5 mm band,
   or the 244-246 GHz segment must accept interference from industrial,
   scientific, and medical (ISM) equipment.

   (f) Amateur stations transmitting in the following segments must not
   cause harmful interference to radio astronomy stations: 3.332-3.339
   GHz, 3.3458-3.3525 GHz, 76-77.5 GHz, 78-81 GHz, 136-141 GHz, 241-248
   GHz, 275-323 GHz, 327-371 GHz, 388-424 GHz, 426-442 GHz, 453-510 GHz,
   623-711 GHz, 795-909 GHz, or 926-945 GHz. In addition, amateur stations
   transmitting in the following segments must not cause harmful
   interference to stations in the Earth exploration-satellite service
   (passive) or the space research service (passive): 275-277 GHz, 294-306
   GHz, 316-334 GHz, 342-349 GHz, 363-365 GHz, 371-389 GHz, 416-434 GHz,
   442-444 GHz, 496-506 GHz, 546-568 GHz, 624-629 GHz, 634-654 GHz,
   659-661 GHz, 684-692 GHz, 730-732 GHz, 851-853 GHz, or 951-956 GHz.

   (g) Amateur stations transmitting in the 1900-2000 kHz segment must not
   cause harmful interference to, and must accept interference from,
   stations authorized by other nations in the fixed, mobile except
   aeronautical mobile, and radionavigation services.

   (h) Amateur stations may only transmit single sideband, suppressed
   carrier (emission type 2K80J3E), upper sideband on the channels 5332
   kHz, 5348 kHz, 5368 kHz, 5373 kHz, and 5405 kHz. Amateur operators
   shall ensure that their station's transmission occupies only 2.8 kHz
   centered at each of these frequencies. Amateur stations must not cause
   harmful interference to, and must accept interference from, stations
   authorized by:

   (1) The United States Government, the FCC, or other nations in the
   fixed service; and

   (2) Other nations in the mobile except aeronautical mobile service.

   (i) Amateur stations transmitting in the 7.2-7.3 MHz segment must not
   cause harmful interference to, and must accept interference from,
   international broadcast stations whose programming is intended for use
   within Region 1 or Region 3.

   (j) Amateur stations transmitting in the 30 m band must not cause
   harmful interference to, and must accept interference from, stations by
   other nations in the fixed service. The licensee of the amateur station
   must make all necessary adjustments, including termination of
   transmissions, if harmful interference is caused.

   (k) For amateur stations located in ITU Regions 1 and 3: Amateur
   stations transmitting in the 146-148 MHz segment or the 10.00-10.45 GHz
   segment must not cause harmful interference to, and must accept
   interference from, stations of other nations in the fixed and mobile
   services.

   (l) In the 219-220 MHz segment:

   (1) Use is restricted to amateur stations participating as forwarding
   stations in fixed point-to-point digital message forwarding systems,
   including intercity packet backbone networks. It is not available for
   other purposes.

   (2) Amateur stations must not cause harmful interference to, and must
   accept interference from, stations authorized by:

   (i) The FCC in the Automated Maritime Telecommunications System (AMTS),
   the 218-219 MHz Service, and the 220 MHz Service, and television
   stations broadcasting on channels 11 and 13; and

   (ii) Other nations in the fixed and maritime mobile services.

   (3) No amateur station may transmit unless the licensee has given
   written notification of the station's specific geographic location for
   such transmissions in order to be incorporated into a database that has
   been made available to the public. The notification must be given at
   least 30 days prior to making such transmissions. The notification must
   be given to: The American Radio Relay League, Inc., 225 Main Street,
   Newington, CT 06111-1494.

   (4) No amateur station may transmit from a location that is within 640
   km of an AMTS coast station that operates in the 217-218 MHz and
   219-220 MHz bands unless the amateur station licensee has given written
   notification of the station's specific geographic location for such
   transmissions to the AMTS licensee. The notification must be given at
   least 30 days prior to making such transmissions. The location of AMTS
   coast stations using the 217-218/219-220 MHz channels may be obtained
   as noted in paragraph (l)(3) of this section.

   (5) No amateur station may transmit from a location that is within 80
   km of an AMTS coast station that uses frequencies in the 217-218 MHz
   and 219-220 MHz bands unless that amateur station licensee holds
   written approval from that AMTS licensee. The location of AMTS coast
   stations using the 217-218/219-220 MHz channels may be obtained as
   noted in paragraph (l)(3) of this section.

   (m) In the 70 cm band:

   (1) No amateur station shall transmit from north of Line A in the
   420-430 MHz segment. See § 97.3(a) for the definition of Line A.

   (2) Amateur stations transmitting in the 420-430 MHz segment must not
   cause harmful interference to, and must accept interference from,
   stations authorized by the FCC in the land mobile service within 80.5
   km of Buffalo, Cleveland, and Detroit. See § 2.106, footnote US230 for
   specific frequencies and coordinates.

   (3) Amateur stations transmitting in the 420-430 MHz segment or the
   440-450 MHz segment must not cause harmful interference to, and must
   accept interference from, stations authorized by other nations in the
   fixed and mobile except aeronautical mobile services.

   (n) In the 33 cm band:

   (1) Amateur stations must not cause harmful interference to, and must
   accept interference from, stations authorized by:

   (i) The United States Government;

   (ii) The FCC in the Location and Monitoring Service; and

   (iii) Other nations in the fixed service.

   (2) No amateur station shall transmit from those portions of Texas and
   New Mexico that are bounded by latitudes 31DEG41' and 34DEG30' North
   and longitudes 104DEG11' and 107DEG30' West; or from outside of the
   United States and its Region 2 insular areas.

   (3) No amateur station shall transmit from those portions of Colorado
   and Wyoming that are bounded by latitudes 39DEG and 42DEG North and
   longitudes 103DEG and 108DEG West in the following segments:
   902.4-902.6 MHz, 904.3-904.7 MHz, 925.3-925.7 MHz, and 927.3-927.7 MHz.

   (o) Amateur stations transmitting in the 23 cm band must not cause
   harmful interference to, and must accept interference from, stations
   authorized by:

   (1) The United States Government in the aeronautical radionavigation,
   Earth exploration-satellite (active), or space research (active)
   services;

   (2) The FCC in the aeronautical radionavigation service; and

   (3) Other nations in the Earth exploration-satellite (active),
   radionavigation-satellite (space-to-Earth) (space-to-space), or space
   research (active) services.

   (p) In the 13 cm band:

   (1) Amateur stations must not cause harmful interference to, and must
   accept interference from, stations authorized by other nations in fixed
   and mobile services.

   (2) Amateur stations transmitting in the 2305-2310 MHz segment must not
   cause harmful interference to, and must accept interference from,
   stations authorized by the FCC in the fixed, mobile except aeronautical
   mobile, and radiolocation services.

   (q) Amateur stations transmitting in the 3.4-3.5 GHz segment must not
   cause harmful interference to, and must accept interference from,
   stations authorized by other nations in the fixed and fixed-satellite
   (space-to-Earth) services.

   (r) In the 5 cm band:

   (1) Amateur stations transmitting in the 5.650-5.725 GHz segment must
   not cause harmful interference to, and must accept interference from,
   stations authorized by other nations in the mobile except aeronautical
   mobile service.

   (2) Amateur stations transmitting in the 5.850-5.925 GHz segment must
   not cause harmful interference to, and must accept interference from,
   stations authorized by the FCC and other nations in the fixed-satellite
   (Earth-to-space) and mobile services and also stations authorized by
   other nations in the fixed service. In the United States, the use of
   mobile service is restricted to Dedicated Short Range Communications
   operating in the Intelligent Transportation System.

   (s) Authorization of the 76-77 GHz segment for amateur station
   transmissions is suspended until such time that the Commission may
   determine that amateur station transmissions in this segment will not
   pose a safety threat to vehicle radar systems operating in this
   segment.

   (t) Amateur stations transmitting in the 2.5 mm band must not cause
   harmful interference to, and must accept interference from, stations
   authorized by the United States Government, the FCC, or other nations
   in the fixed, inter-satellite, or mobile services.

   Note to § 97.303: The Table of Frequency Allocations contains the
   complete, unabridged, and legally binding frequency sharing
   requirements that pertain to the Amateur Radio Service. See 47 CFR
   2.104, 2.105, and 2.106. The United States, Puerto Rico, and the U.S.
   Virgin Islands are in Region 2 and other U.S. insular areas are in
   either Region 2 or 3; see appendix 1 to part 97.

   [ 75 FR 27203 , May 14, 2010]