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PSA - Public Service Announcement: An ad that is run in the public interest rather than for a commercial product of service.

It is used by AM broadcast stations and requires an AM receiver. Analog Transmission: A continuous signal that varies in amplitude (AM) or frequency (FM), as opposed to a digital signal.

Bumper: A song, music, or ‚Äčother element that signals a transition to or from commercial breaks. Call sign - call letters: The unique designation of transmitter broadcast stations.

Tex Mex, as we Americans know it today, is a twentieth century phenomenon.

Dictionaries and food history sources confirm the first print evidence of the term "Tex Mex" occured in the 1940s.

Payola: Illegal practice of taking payment or other benefits to play certain songs on the radio and not identifying the sponsorship.

Payola scandals have been common in the radio broadcast industry from the 1950s to the early 2000s.Drive time: The rush hour commuter periods when radio stations usually have their largest audience. FM - Frequency Modulation: A broadcast that varies the frequency of the carrier wave and requires an FM receiver. High Definition Radio / HD Radio: a technology that transmits digital audio and data alongside existing AM and FM analog signals.Hit the post: An expression deejays use to describe talking up to the point when the lyrics begin without "stepping" on the beginning of the vocals.As playlists are now rarely chosen by the DJs themselves and are delivered pre-recorded by companies, there is less opportunity for payola.Playlist: The list of songs that a station will play.Stations must announce their call sign on the top of each hour and when signing on or off the air for stations that don't broadcast 24 hours per day.

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