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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.
United States amateur radio call signs consist of one or two letters, followed by a single digit, and closing with one to three more letters. [21] The number in the call sign indicates in which of the ten U.S. radio districts the license was issued.
The following is a list of FCC -licensed radio stations in the U.S. state of Pennsylvania, which can be sorted by their call signs, frequencies, cities of license, licensees, and programming formats .
In the United States, the policy on radio identification depends on the service. Station identification is usually done in the station's standard mode of operation, though the FCC considers Morse code identification to be universally acceptable no matter what mode the station is operating in.
A police code is a brevity code, usually numerical or alphanumerical, used to transmit information between law enforcement over police radio systems in the United States. Examples of police codes include "10 codes" (such as 10-4 for "okay" or "acknowledged"—sometimes written X4 or X-4), signals, incident codes, response codes, or other status ...
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The several potential contenders for the title of "oldest radio station" are listed below, organized by sign-on date. These are not restricted to radio broadcasting , i.e., the transmissions were not necessarily intended to reach a wide audience.
A numbers station is a shortwave radio station characterized by broadcasts of formatted numbers, which are believed to be addressed to intelligence officers operating in foreign countries. Most identified stations use speech synthesis to vocalize numbers, although digital modes such as phase-shift keying and frequency-shift keying , as well as ...
The following is a list of FCC-licensed AM and FM radio stations in the U.S. state of Texas, which can be sorted by their call signs, broadcast frequencies, cities of license, licensees, or programming formats.
The following is a list of FCC -licensed radio stations in the U.S. state of Florida, which can be sorted by their call signs, frequencies, cities of license, licensees, and programming formats .
Amateur First Grade required an essay-type examination and five (later ten) words per minute code examination before a Radio Inspector at one of the Department's field offices. This class of license was renamed Amateur Class in 1927 and then Amateur First Class in 1932.