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An amateur operator's call sign is composed of a prefix, a separating numeral and a suffix. The prefix can be composed of letters or numbers, the separating numeral is between 0 and 9, and a suffix is from one to four characters, usually letters. [5] Examples of call signs and their constituent parts are as follows:
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]
QRZ.com is an amateur radio website listing almost every callsign in the world. In 1992, QRZ founder Fred L. Lloyd accessed data from the FCC database to create a CD-ROM with all call signs issued in the United States. [1] A copy of the CD-ROM is carried on board the International Space Station and one was also aboard the Russian Mir space station.
In Indonesia, radio stations are assigned call signs beginning with PM for AM and FM stations or YB-YH for amateur radio stations. Calls beginning with PM are then followed by a number indicating the province where the station is in, the letters B, C, D and F (B for AM stations, C for some stations in Kalimantan , D for some stations in Sumatra ...
Online callbooks or call sign databases can be browsed or searched to find out who holds a specific call sign. [58] An example of an online callbook is QRZ.com. Non-exhaustive lists of famous people who hold or have held amateur radio call signs have also been compiled and published. [59]
The call sign format for radio and television call signs follows a number of conventions. All call signs begin with a prefix assigned by the International Telecommunication Union (ITU). For example, the United States has been assigned the following prefixes: AAA – ALZ , K , N , W .
Special event call signs are issued with a 'GB' prefix, but others like GQ, GO, GR, MQ, GA, MO, and 2O have been issued in special cases. Ofcom also allows numerals in special event call sign suffixes. For instance GB75RD was a special event sign for the 75th anniversary of the Reading and District Amateur radio club. [13]
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