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United States portal. v. t. e. Radio broadcasting has been used in the United States since the early 1920s to distribute news and entertainment to a national audience. In 1923, 1 percent of U.S. households owned at least one radio receiver, while a majority did by 1931 and 75 percent did by 1937.
Both the Amateur Extra Class' 20 words-per-minute (WPM); and General and Advanced classes' 13 WPM Morse code tests, were removed in favor of a standardized 5 WPM as the sole Morse code requirement for both the General and Extra Class licenses.
Conservative talk radio is a talk radio format in the United States and other countries devoted to expressing conservative viewpoints of issues, as opposed to progressive talk radio. The definition of conservative talk is generally broad enough that libertarian talk show hosts are also included in the definition.
Radio Data System ( RDS) is a communications protocol standard for embedding small amounts of digital information in conventional FM radio broadcasts. RDS standardizes several types of information transmitted, including time, station identification and program information.
The commissioners settled on a rule that limited AM stations licensed in cities of more than 100,000 people to no more than 50 percent duplication of their AM signal on an affiliated FM station. Duplication was defined as either the simulcasting of the signal or its rebroadcast within 24 hours.
Ten-codes, officially known as ten signals, are brevity codes used to represent common phrases in voice communication, particularly by law enforcement and in citizens band (CB) radio transmissions. The police version of ten-codes is officially known as the APCO Project 14 Aural Brevity Code.
Radio amateurs use a variety of transmission modes, including Morse code, radioteletype, data, and voice. Specific frequency allocations vary from country to country and between ITU regions as specified in the current ITU HF frequency allocations for amateur radio. [1]
Radio broadcasts consist of amplitude modulation (AM) and frequency modulation (FM) stations, noncommercial radio stations, and low-powered broadcast stations, to name a few, all are administrated by the policies in Title 47 of the Code of Federal Regulations.
Gross rating points are a measure of the impact by a campaign using a specific medium or schedule. It quantifies impressions as a percentage of the target population, multiplied by frequency. This percentage may be greater, or in fact much greater, than 100.
A Radio code is any code that is commonly used over a telecommunication system such as Morse code, brevity codes and procedure words.