How do radio stations work?

AM and FM radio stations work by sending out shows via radio towers. Listeners that have receivers in their car or at home can tune in. Not many people know this, but AM and FM stand for: AM = Amplitude Modulation. FM = Frequency Modulation. Both are transmitted over the air via radio waves. read more

FM radio operates in the range of 87.5 MHz to 108.0 MHz, which is a much higher range of frequencies than AM radio. The distance range for FM transmissions are more limited than AM – usually less than 100 miles. read more

See How Radio Works for more details on radio waves. When you listen to a radio station and the announcer says, "You are listening to 91.5 FM WRKX The Rock!," what the announcer means is that you are listening to a radio station broadcasting an FM radio signal at a frequency of 91.5 megahertz, with FCC-assigned call letters of WRKX. read more

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