Jump to navigation. A unique call sign is assigned to each amateur station during the processing of its license applications. Each new call sign is assigned sequentially using the sequential call sign system, which is based on the alphabetized regional-group list for the licensee's operator class and mailing address. The station is reassigned its same call sign upon renewal or modification of its license, unless the licensee applies for a change to a new sequentially assigned or vanity call sign on FCC Form
In broadcasting and radio communications , a call sign also known as a call name or call letters —and historically as a call signal —or abbreviated as a call is a unique designation for a transmitter station. The use of call signs as unique identifiers dates to the landline railroad telegraph system. Because there was only one telegraph line linking all railroad stations , there needed to be a way to address each one when sending a telegram. In order to save time, two-letter identifiers were adopted for this purpose.
Amateur radio call signs are allocated to amateur radio operators around the world. The call signs are used to legally identify the station or operator, with some countries requiring the station call sign to always be used and others allowing the operator call sign instead. The International Telecommunication Union ITU allocates call sign prefixes for radio and television stations of all types. Since these have been used to uniquely identify operators and locate amateur stations within a geographical region or country of the world.
A number of phonetic alphabets exist. The NATO version is most common and can be considered to be the "international" phonetic alphabet. Main articles: morse code , Wikipedia:Morse code.