47 C.F.R. § 73.207 Minimum distance separation between stations.
Title 47 - Telecommunication
Title 47: Telecommunication
PART 73—RADIO BROADCAST SERVICES
Subpart B—FM Broadcast Stations
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§ 73.207 Minimum distance separation between stations.
(a) Except for assignments made pursuant to §73.213 or 73.215, FM allotments and assignments must be separated from other allotments and assignments on the same channel (co-channel) and five pairs of adjacent channels by not less than the minimum distances specified in paragraphs (b) and (c) of this section. The Commission will not accept petitions to amend the Table of Allotments unless the reference points meet all of the minimum distance separation requirements of this section. The Commission will not accept applications for new stations, or applications to change the channel or location of existing assignments unless transmitter sites meet the minimum distance separation requirements of this section, or such applications conform to the requirements of §73.213 or 73.215. However, applications to modify the facilities of stations with short-spaced antenna locations authorized pursuant to prior waivers of the distance separation requirements may be accepted, provided that such applications propose to maintain or improve that particular spacing deficiency. Class D (secondary) assignments are subject only to the distance separation requirements contained in paragraph (b)(3) of this section. (See §73.512 for rules governing the channel and location of Class D (secondary) assignments.)
(b) The distances listed in Tables A, B, and C apply to allotments and assignments on the same channel and each of five pairs of adjacent channels. The five pairs of adjacent channels are the first (200 kHz above and 200 kHz below the channel under consideration), the second (400 kHz above and below), the third (600 kHz above and below), the fifty-third (10.6 MHz above and below), and the fifty-fourth (10.8 MHz above and below). The distances in the Tables apply regardless of whether the proposed station class appears first or second in the “Relation” column of the table.
(1) Domestic allotments and assignments must be separated from each other by not less than the distances in Table A which follows:
Table A_Minimum Distance Separation Requirements in Kilometers (miles)------------------------------------------------------------------------ Co- 400/600 10.6/ Relation channel 200 kHz kHz 10.8 MHz------------------------------------------------------------------------A to A.......................... 115 (71) 72 (45) 31 (19) 10 (6)A to B1......................... 143 (89) 96 (60) 48 (30) 12 (7)A to B.......................... 178 113 (70) 69 (43) 15 (9) (111)A to C3......................... 142 (88) 89 (55) 42 (26) 12 (7)A to C2......................... 166 106 (66) 55 (34) 15 (9) (103)A to C1......................... 200 133 (83) 75 (47) 22 (14) (124)A to C0......................... 215 152 (94) 86 (53) 25 (16) (134)A to C.......................... 226 165 95 (59) 29 (18) (140) (103)B1 to B1........................ 175 114 (71) 50 (31) 14 (9) (109)B1 to B......................... 211 145 (90) 71 (44) 17 (11) (131)B1 to C3........................ 175 114 (71) 50 (31) 14 (9) (109)B1 to C2........................ 200 134 (83) 56 (35) 17 (11) (124)B1 to C1........................ 233 161 77 (48) 24 (15) (145) (100)B1 to C0........................ 248 180 87 (54) 27 (17) (154) (112)B1 to C......................... 259 193 105 (65) 31 (19) (161) (120)B to B.......................... 241 169 74 (46) 20 (12) (150) (105)B to C3......................... 211 145 (90) 71 (44) 17 (11) (131)B to C2......................... 241 169 74 (46) 20 (12) (150) (105)B to C1......................... 270 195 79 (49) 27 (17) (168) (121)B to C0......................... 272 214 89 (55) 31 (19) (169) (133)B to C.......................... 274 217 105 (65) 35 (22) (170) (135)C3 to C3........................ 153 (95) 99 (62) 43 (27) 14 (9)C3 to C2........................ 177 117 (73) 56 (35) 17 (11) (110)C3 to C1........................ 211 144 (90) 76 (47) 24 (15) (131)C3 to C0........................ 226 163 87 (54) 27 (17) (140) (101)C3 to C......................... 237 176 96 (60) 31 (19) (147) (109)C2 to C2........................ 190 130 (81) 58 (36) 20 (12) (118)C2 to C1........................ 224 158 (98) 79 (49) 27 (17) (139)C2 to C0........................ 239 176 89 (55) 31 (19) (148) (109)C2 to C......................... 249 188 105 (65) 35 (22) (155) (117)C1 to C1........................ 245 177 82 (51) 34 (21) (152) (110)C1 to C0........................ 259 196 94 (58) 37 (23) (161) (122)C1 to C......................... 270 209 105 (65) 41 (25) (168) (130)C0 to C0........................ 270 207 96 (60) 41 (25) (168) (129)C0 to C......................... 281 220 105 (65) 45 (28) (175) (137)C to C.......................... 290 241 105 (65) 48 (30) (180) (150)------------------------------------------------------------------------
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(2) Under the Canada-United States FM Broadcasting Agreement, domestic U.S. allotments and assignments within 320 kilometers (199 miles) of the common border must be separated from Canadian allotments and assignments by not less than the distances given in Table B, which follows. When applying Table B, U.S. Class C2 allotments and assignments are considered to be Class B; also, U.S. Class C3 allotments and assignments and U.S. Class A assignments operating with more than 3 kW ERP and 100 meters antenna HAAT (or equivalent lower ERP and higher antenna HAAT based on a class contour distance of 24 km) are considered to be Class B1.
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Table B_Minimum Distance Separation Requirements in Kilometers---------------------------------------------------------------------------------------------------------------- Co- Adjacent Channels I.F. Channel --------------------------------------- Relation ---------- 10.6/ 0 kHz 200 kHz 400 kHz 600 kHz 10.8 MHz----------------------------------------------------------------------------------------------------------------A-A........................................................... 132 85 45 37 8A-B1.......................................................... 180 113 62 54 16A-B........................................................... 206 132 76 69 16A-C1.......................................................... 239 164 98 90 32A-C........................................................... 242 177 108 100 32B1-B1......................................................... 197 131 70 57 24B1-B.......................................................... 223 149 84 71 24B1-C1......................................................... 256 181 106 92 40B1-C.......................................................... 259 195 116 103 40B-B........................................................... 237 164 94 74 24 ........ ........ ........ ........ ........B-C1.......................................................... 271 195 115 95 40B-C........................................................... 274 209 125 106 40C1-C1......................................................... 292 217 134 101 48C1-C.......................................................... 302 230 144 111 48C-C........................................................... 306 241 153 113 48----------------------------------------------------------------------------------------------------------------
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(3) Under the 1992 Mexico-United States FM Broadcasting Agreement, domestic U.S. assignments or allotments within 320 kilometers (199 miles) of the common border must be separated from Mexican assignments or allotments by not less than the distances given in Table C in this paragraph (b)(3). When applying Table C—
(i) U.S. or Mexican assignments or allotments which have been notified internationally as Class A are limited to a maximum of 3.0 kW ERP at 100 meters HAAT, or the equivalent;
(ii) U.S. or Mexican assignments or allotments which have been notified internationally as Class AA are limited to a maximum of 6.0 kW ERP at 100 meters HAAT, or the equivalent;
(iii) U.S. Class C3 assignments or allotments are considered Class B1;
(iv) U.S. Class C2 assignments or allotments are considered Class B; and
(v) Class C1 assignments or allotments assume maximum facilities of 100 kW ERP at 300 meters HAAT. However, U.S. Class C1 stations may not, in any event, exceed the domestic U.S. limit of 100 kW ERP at 299 meters HAAT, or the equivalent.
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Table C_Minimum Distance Separation Requirements in Kilometers------------------------------------------------------------------------ 400 kHz 10.6 or Relation Co- 200 kHz or 600 10.8 MHz Channel kHz (I.F.)------------------------------------------------------------------------A to A...................... 100 61 25 8A to AA..................... 111 68 31 9A to B1..................... 138 88 48 11A to B...................... 163 105 65 14A to C1..................... 196 129 74 21A to C...................... 210 161 94 28AA to AA.................... 115 72 31 10AA to B1.................... 143 96 48 12AA to B..................... 178 125 69 15AA to C1.................... 200 133 75 22AA to C..................... 226 165 95 29B1 to B1.................... 175 114 50 14B1 to B..................... 211 145 71 17B1 to C1.................... 233 161 77 24B1 to C..................... 259 193 96 31B to B...................... 237 164 65 20B to C1..................... 270 195 79 27B to C...................... 270 215 98 35C1 to C1.................... 245 177 82 34C1 to C..................... 270 209 102 41C to C...................... 290 228 105 48------------------------------------------------------------------------
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(c) The distances listed below apply only to allotments and assignments on Channel 253 (98.5 MHz). The Commission will not accept petitions to amend the Table of Allotments, applications for new stations, or applications to change the channel or location of existing assignments where the following minimum distances (between transmitter sites, in kilometers) from any TV Channel 6 allotment or assignment are not met:
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Minimum Distance Separation From TV Channel 6 (82-88 MHz)------------------------------------------------------------------------ TV Zones II FM Class TV Zone I & III------------------------------------------------------------------------A............................................. 17 22B1............................................ 19 23B............................................. 22 26C3............................................ 19 23C2............................................ 22 26C1............................................ 29 33C............................................. 36 41------------------------------------------------------------------------
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[48 FR 29504, June 27, 1983, as amended at 49 FR 10264, Mar. 20, 1984; 49 FR 19670, May 9, 1984; 49 FR 50047, Dec. 26, 1984; 51 FR 26250, July 22, 1986; 54 FR 14963, Apr. 14, 1989; 54 FR 16366, Apr. 24, 1989; 54 FR 19374, May 5, 1989; 54 FR 35338, Aug. 25, 1989; 56 FR 27426, June 14, 1991; 56 FR 57293, Nov. 8, 1991; 62 FR 50256, Sept. 25, 1997; 65 FR 79776, Dec. 20, 2000]
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