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A police radio 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 ...
Police units in the United States tend to use a tactical designator (or tactical callsign) consisting of a letter of the police radio alphabet followed by one or two numbers. For example, "Mary One" might identify the head of a city's homicide division. Police and fire department radio systems are assigned official callsigns, however. Examples ...
The following is a list of the FCC-licensed radio stations in the United States Commonwealth of Massachusetts, which can be sorted by their call signs, frequencies, cities of license, licensees, and programming formats.
Map showing the numeral codes for amateur radio call signs in the United States. The region in which the operator was licensed determines the numeral. 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. [20]
The first Coast Guard shore stations were established after 1924, when the Coast Guard's mission expanded. The first shore station was at Rockaway Point Coast Guard Station, located at Fort Tilden, New York; and the network expanded to Nahant, Massachusetts; New London, Connecticut; Cape May, New Jersey; Cape Henry, Virginia (with the call sign NMN); Fernandina, Florida; Fort Lauderdale ...
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.
A notable development was the adoption of a daily schedule beginning on May 21, 1921, when 1XE began broadcasting, each evening at 7:20 p.m., "information as to fugitives, stolen automobiles, and similar information of interest to outlying police" that had been collected at Boston police headquarters for dissemination by the radio station.
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).