FM Classes
- The following table lists the various classes of FM stations, the reference facilities for each station class, and the protected and city grade contours for each station class:
| FM Station Class |
Reference (maximum) facilities for station class (ERP / HAAT) |
FM protected or primary service contour |
Distance to protected or primary service contour |
Distance to 70 dBu city-grade or principal community coverage contour |
|---|---|---|---|---|
| Class A | 6 kW 100 m (328 ft) |
60 dBu (1.0mV/m) | 28.3 km (17.6 mi) | 16.2 km (10.1 mi) |
| Class B1 | 25 kW 100 m (328 ft) |
57 dBu (0.7mV/m) | 44.7 km (27.8 mi) | 23.2 km (14.4 mi) |
| Class B | 50 kW 150 m (492 ft) |
54 dBu (0.5mV/m) | 65.1 km (40.5 mi) | 32.6 km (20.3 mi) |
| Class C3 | 25 kW 100 m (328 ft) |
60 dBu (1.0mV/m) | 39.1 km (24.3 mi) | 23.2 km (14.4 mi) |
| Class C2 | 50 kW 150 m (492 ft) |
60 dBu (1.0mV/m) | 52.2 km (32.4 mi) | 32.6 km (20.3 mi) |
| Class C1 | 100 kW 299 m (981 ft) |
60 dBu (1.0mV/m) | 72.3 km (44.9 mi) | 50.0 km (31.1 mi) |
| Class C0 | 100 kW 450 m (1,476 ft) |
60 dBu (1.0mV/m) | 83.4 km (51.8 mi) | 59.0 km (36.7 mi) |
| Class C | 100 kW 600 m (1,969 ft) |
60 dBu (1.0mV/m) | 91.8 km (57.0 mi) | 67.7 km (42.1 mi) |
Historically, there were local "Class A" frequencies (like AM radio's class C stations) to which only class A stations would be allocated & the other frequencies could not have a class A. According to the 1982 FCC rules & regulations those frequencies were: 92.1, 92.7, 93.5, 94.3, 95.3, 95.9, 96.7, 97.7, 98.3, 99.3, 100.1, 100.9, 101.7, 102.3, 103.1, 103.9, 104.9, 105.5, 106.3 & 107.1.
Read more about this topic: List Of North American Broadcast Station Classes, FM
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