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Also AM radio or AM. Used interchangeably with kilohertz (kHz) and medium wave. A modulation technique used in electronic communication where the amplitude (signal strength) of the wave is varied in proportion to that of the message signal. Developed in the early 1900s, this technique is most commonly used for transmitting an audio signal via a radio wave measured in kilohertz (kHz). See AM ...
The original radio stations were primarily used for private point-to-point communication. The early 1920s saw the introduction of radio broadcasting, and by the end of 1922 there were over 500 broadcasting stations operating in the United States. Most of the first broadcasting stations received randomly assigned three-letter call signs.
Mexican broadcast stations are assigned call signs beginning with "XE" (for mediumwave and shortwave stations) or "XH" (for FM radio and television stations), followed by one and up to five letters and a suffix according to the band in which they broadcast, these suffixes are: "-AM", "-OC" (shortwave or Onda Corta), "-FM" and "-TDT ...
In the United States, all radio and television broadcasting stations that are licensed by the Federal Communications Commission (FCC) are assigned official, distinct call signs. Organized broadcasting began in the U.S. in the early 1920s on the AM band — FM and television did not exist yet. Initially most broadcasting stations were assigned ...
See also References External links A advocacy journalism A type of journalism which deliberately adopts a non- objective viewpoint, usually committed to the endorsement of a particular social or political cause, policy, campaign, organization, demographic, or individual. alternative journalism A type of journalism practiced in alternative media, typically by open, participatory, non ...
Broadcast call signs are call signs assigned as unique identifiers to radio stations and television stations. While broadcast radio stations will often brand themselves with plain-text names, identities such as " cool FM ", " rock 105" or "the ABC network" are not globally unique.
Blackout (broadcasting) Block error; Blooper; Blu-ray; Boom operator (media) Bottle episode; Breakfast television; Broadcast automation; Broadcast calendar; Broadcast designer; Broadcast engineering; Broadcast flag; Broadcast journalism; Broadcast law; Broadcast lens; Broadcast network; Broadcast quality; Broadcast reference monitor; Broadcast ...
Russian nuclear icebreaker Arktika with call sign UKTY. Merchant and naval vessels are assigned call signs by their national licensing authorities. In the case of states such as Liberia or Panama, which are flags of convenience for ship registration, call signs for larger vessels consist of the national prefix plus three letters (for example, 3LXY, and sometimes followed by a number, e.g. 3LXY2).