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Sec. 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 ยง97.301 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 24.05โ€“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 1900โ€“2000 kHz segment, the 76โ€“77.5 GHz segment, the 78โ€“81 GHz segment, the 136โ€“141 GHz segment, or the 241โ€“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 430โ€“450 MHz segment, the 23 cm band, the 3.3โ€“3.4 GHz segment, the 5.65โ€“5.85 GHz segment, the 13 cm band, or the 24.05โ€“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 2400โ€“2450 MHz segment, the 5.725โ€“5.875 GHz segment, the 1.2 cm band, the 2.5 mm band, or the 244โ€“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: 3.332โ€“3.339 GHz, 3.3458โ€“3.3525 GHz, 76โ€“77.5 GHz, 78โ€“81 GHz, 136โ€“141 GHz, 241โ€“248 GHz, 275โ€“323 GHz, 327โ€“371 GHz, 388โ€“424 GHz, 426โ€“442 GHz, 453โ€“510 GHz, 623โ€“711 GHz, 795โ€“909 GHz, or 926โ€“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): 275โ€“277 GHz, 294โ€“306 GHz, 316โ€“334 GHz, 342โ€“349 GHz, 363โ€“365 GHz, 371โ€“389 GHz, 416โ€“434 GHz, 442โ€“444 GHz, 496โ€“506 GHz, 546โ€“568 GHz, 624โ€“629 GHz, 634โ€“654 GHz, 659โ€“661 GHz, 684โ€“692 GHz, 730โ€“732 GHz, 851โ€“853 GHz, or 951โ€“956 GHz.

(g) Amateur stations transmitting in the 1900โ€“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 7.2โ€“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 146โ€“148 MHz segment or the 10.00โ€“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 219โ€“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 218โ€“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 06111โ€“1494.

(4) No amateur station may transmit from a location that is within 640 km of an AMTS coast station that operates in the 217โ€“218 MHz and 219โ€“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 217โ€“218/219โ€“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 217โ€“218 MHz and 219โ€“220 MHz bands unless that amateur station licensee holds written approval from that AMTS licensee. The location of AMTS coast stations using the 217โ€“218/219โ€“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 420โ€“430 MHz segment. See ยง97.3(a) for the definition of Line A.

(2) Amateur stations transmitting in the 420โ€“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 ยง2.106, footnote US230 for specific frequencies and coordinates.

(3) Amateur stations transmitting in the 420โ€“430 MHz segment or the 440โ€“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 31ยฐ41' and 34ยฐ30' North and longitudes 104ยฐ11' and 107ยฐ30' 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 39ยฐ and 42ยฐ North and longitudes 103ยฐ and 108ยฐ West in the following segments: 902.4โ€“902.6 MHz, 904.3โ€“904.7 MHz, 925.3โ€“925.7 MHz, and 927.3โ€“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 2305โ€“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 3.4โ€“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 5.650โ€“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 5.850โ€“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 76โ€“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 ยง97.303: 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]


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