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FM Station Separation Requirements
47 CFR Section 73.207

The following table lists the FM spacing standards contained in Table A of 47 CFR Section 73.207 of the FCC's rules for the various classes of FM commercial radio stations in the USA. These separations also apply to all noncommercial educational stations operating between 92.1 MHZ to 107.9 MHz (Channels 221 to 300), and to certain noncommercial ecuational stations on Channels 218, 219 and 220 which must meet these spacings to FM stations operating on Channels 221, 222, and 223. Intermediate Frequency (I.F.) separations apply both to commercial and most noncommercial educational stations.

These minimum separations must be met before a petition for rulemaking may be filed for new FM allotments. FM broadcast stations or applicants for an existing commercial-band allotment may in some cases apply for (on FCC Form 301) a transmitter site which is closer spaced than these requirements, provided that the provisions of 47 CFR Section 73.215 are met. In addition to these separations, applicants or petitioners for Channel 253 (98.5 MHz) must also meet the I.F. spacing with respect to TV Channel 6 stations.

Applicants and petitioners for rulemaking within 320 km of the Canadian and Mexican borders must meet different spacing standards with respect to foreign stations. These are located in the Canadian Border Zone Spacings and the Mexican Border Zone Spacings documents.

Noncommercial Educational FM stations on Channels 218, 219, and 220 mustalso meet these separations with respect to commercial FM stations and vacant allotments on Channels 221, 222 and 223. The I.F. separation requirements in the following table also apply to noncommercial educational stations.

Spacing requirements for LPFM stations and applications will be found in 47 CFR 73.807.

Spacings should be rounded to the nearest kilometer, per 47 CFR 73.208.

Minimum Distance Separation Requirements in Kilometers


Table A, Section 73.207
Relation Co-Channel
(Same Frequency)
200 kHz
(First-Adjacent Channel)
400 or 600 kHz
(Second- or Third-Adjacent Channel)
10.6 or 10.8 MHz
(I.F. Channel)
A to A 115 72 31 10
A to B1 143 96 48 12
A to B 178 113 69 15
A to C3 142 89 42 12
A to C2 166 106 55 15
A to C1 200 133 75 22
A to C0 215 152 86 25
A to C 226 165 95 29
B1 to B1 175 114 50 14
B1 to B 211 145 71 17
B1 to C3 175 114 50 14
B1 to C2 200 134 56 17
B1 to C1 233 161 77 24
B1 to C0 248 180 87 27
B1 to C 259 193 105 31
B to B 241 169 74 20
B to C3 211 145 71 17
B to C2 241 169 74 20
B to C1 270 195 79 27
B to C0 272 214 89 31
B to C 274 217 105 35
C3 to C3 153 99 43 14
C3 to C2 177 117 56 17
C3 to C1 211 144 76 24
C3 to C0 226 163 87 27
C3 to C 237 176 96 31
C2 to C2 190 130 58 20
C2 to C1 224 158 79 27
C2 to C0 239 176 89 31
C2 to C 249 188 105 35
C1 to C1 245 177 82 34
C1 to C0 259 196 94 37
C1 to C 270 209 105 41
C0 to C0 270 207 96 41
C0 to C 281 220 105 45
C to C 290 241 105 48

Spacings to Canadian Stations, Spacings to Mexican Stations
Contour Protection Station Spacings (Section 73.215(e)), Channel 253 - TV Channel 6 I.F. Spacings

This page is located at http://www.fcc.gov/mb/audio/spacing/73207.html


     


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