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The Radio Station, 10th Edition by Bruce Mims, John Allen Hendricks

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CHARACTERISTICS OF AM AND FM STATIONS

AM and FM stations are located at different points in the electromagnetic spectrum: AM stations are assigned frequencies between 540 and 1700 kHz on the standard broadcast band, and FM stations are located between 88.1 and 107.9 MHz on the FM band.

Ten kilohertz (kHz) separate the carrier frequencies of AM stations and there are 200 kHz separations between FM station frequencies. FM broadcasters additionally are permitted to provide a secondary content delivery channel, termed a “subsidiary communications authority (SCA)” transmission, to subscribers on a small portion of their frequency allocations.

FIGURE 9.1As seen from ground level, an FM transmitting antenna mounted at ...

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