Canadian Border Zone Spacing

US FM station located within 320 km of the Canadian border has to meet Canadian border zone spacing requirements.

The table below lists spacing requirements for US FM stations with respect to Canadian stations based on FCC 73.207 rule.

Canadian Border Zone Spacing
Relation Co-Channel (Same Frequency) 200 kHz (1st Adjacent Channel) 400 kHz (2nd or 3rd Adjacent Channel) 600 kHz (3rd Adjacent Channel)
A1 - A1 78 km 45 km 24 km 20 km
A1 - A 131 km 78 km 44 km 40 km
A1 - B1 164 km 98 km 57 km 53 km
A1 - B 190 km 117 km 71 km 67 km
A1 - C1 223 km 148 km 92 km 88 km
A1 - C 227 km 162 km 103 km 99 km
A - A 151 km 98 km 51 km 42 km
A - B1 184 km 119 km 64 km 55 km
A - B 210 km 137 km 78 km 69 km
A - C1 243 km 168 km 99 km 90 km
A - C 247 km 182 km 110 km 101 km
B1 - B1 197 km 131 km 70 km 57 km
B1 - B 223 km 149 km 84 km 71 km
B1 - C1 256 km 181 km 106 km 92 km
B1 - C 259 km 195 km 116 km 103 km
B - B 237 km 164 km 94 km 74 km
B - C1 271 km 195 km 115 km 95 km
B - C 274 km 209 km 125 km 106 km
C1 - C1 292 km 217 km 134 km 101 km
C1 - C 302 km 230 km 144 km 111 km
C - C 306 km 241 km 153 km 113 km


Note

  • US and Canadian Class A1 stations which have been notified to the opposite country with maximum permitted facilities of 0.250 kW (250 watts) at 100 meters HAAT (or less) are listed in the table below as Class A1.
  • US and Canadian Class A stations which have been notified to the opposite country with maximum permitted facilities of 6.0 kW ERP at 100 meters HAAT (or less) are listed in the table below as Class A.
  • US Class C3 stations are considered Class B1 stations.
  • US Class C2 stations are considered Class B stations.
  • US Class C0 stations are considered Class C stations.

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