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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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| Using 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 that was designed to pick up and amplify radio signals; also known 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 & operated stations |
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| Broadcast 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 programming |
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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 Commununications 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 the 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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| Transmissions created by changing the speed 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 format 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 analog 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 such as vulgarity, racism, sexism, and cynicism. |
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| Low power, unlicensed, illegal stations |
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