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| The range of frequencies that can be used for transmitting radio waves with electricity. |
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| Telegraph code of dots and dashes invented by Samuel Morse. |
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| The use of wireless technology to instantaneously reach a wide audience. |
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| Name for early radio transmissions, before human voices could be carried on the airwaves. |
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| A tube invented by Lee De Forest and designed to pick up and amplify radio signals; also know as a vacuum tube. |
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| Early plan for radio revenue in which access to radio time would be by fee. |
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| Regular unsponsored broadcast shows designed to maintain audience contact until advertising can be sold for that time. |
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| A group of interconnected broadcast stations that share programming. Also, the parent company that supplies that programming. |
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owned and operated stations (O&Os) |
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| Braodcast stations possessed by and run by the network; they usually carry everything the network provides. |
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| A local station that has a contractual relationship to air a network's prgramming. |
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| Limited nature of broadcast frequencies. |
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"public interest, convenience, and necessity" |
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| A phrase from the Radio Act of 1927 requiring that broadcasting be good for the community. |
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Federal Communications Commission (FCC) |
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| Government agency in charge of regulating all means of interstate telephone and radio communication. |
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| Broadcast station identifications assigned by FCC. |
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amplitude modulation (AM) |
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| Radio transmissions created by changing (modulating) the power (amplitude) of the carrier wave. |
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frequency modulation (FM) |
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| Transmissions created by changing the spread at which radio waves are generated. |
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| A durable, solid-state, miniature version of the large and fragile vacuum tubes used in early radios. |
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| Consistent programming formula with a recognizable sound and personality. |
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| Radio formats in which the current 40 best-selling songs are played in rotation. |
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| A practice in which record companies paid radio station personnel to play certain records. |
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| Radio transmissions in which an electronic waveform represents the sound on a carrier wave. |
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| Signal transmissions by assigned numbers rather than analogue waves. |
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| Time divisions that radio stations make in the day in order to determine programming. |
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| Graphic used by radio programmers showing each feature of the programming hour. |
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Measurements taken from a small percentage of the audience chosen to represent the behavior of the rest of the audience. Broadcast ratings are a form of sampling. |
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| Companies that provide fully automated around-the-clock programming for radio stations. |
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| Broadcast outlets that derive their income from sources other than the sale of advertising time; also known as noncommercial. |
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Radio personalities who derive humor and ratings from lewd and tasteless comments, using tactics like vulgarity, racism, sexism, and cynicism. |
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| Low power, unlicensed, illegal stations. |
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