7.2 Frequency allocations

To prevent radio stations from transmitting signals “on top of each other,” the United States and other national governmentsin the 1930s began regulating the carrier frequencies and power outputs stations could use. With increased use of the radiospectrum for both public and private use, this regulation has become increasingly important. This is the so-called Frequency Allocation Chart , which shows what kinds of broadcasting can occur in which frequency bands. Detailedradio carrier frequency assignments are much too detailed to present here.