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
Famous quotes containing the word classes:
“The difference between people isn’t in their class, but in themselves. Only from the middle classes one gets ideas, and from the common people—life itself, warmth. You feel their hates and loves.”
—D.H. (David Herbert)
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