In broadcasting and radio communications, a call sign (also referred to as a call name or call letters, and historically as a call signal or abbreviated as a call) serves as a distinctive identifier for a transmitter station. Call signs can be formally assigned by government agencies, informally adopted by individuals or organisations, or even cryptographically encoded to obscure a station’s identity.
The use of call signs as unique identifiers traces back to the landline railroad telegraph system. With only one telegraph line linking all railroad stations, there was a need for a method to address each station when sending telegrams efficiently. To expedite this process, two-letter identifiers were introduced. This practice continued into radiotelegraph operations; initially, radio companies assigned two-letter identifiers to coastal and shipboard stations. However, these identifiers were not globally unique, prompting the addition of a one-letter company identifier (e.g., ‘M’ for Marconi stations) later on. By 1912, the need for a standardised system to rapidly identify stations operated by multiple companies across different nations led to the establishment of an international standard. This standard involved using an ITU prefix to identify a country, followed by the remainder of the call sign identifying an individual station within that country.
A call sign is a unique combination of letters and numbers used to identify a radio station, aircraft, or ship.
To obtain a call sign, you must apply to the appropriate regulatory agency, such as the Federal Communications Commission (FCC) for radio stations or the Federal Aviation Administration (FAA) for aircraft.
In some cases, you may be able to request a specific call sign, but it ultimately depends on availability and regulatory guidelines.
In most cases, call signs are not transferable and are tied to the specific licensee or operator.
The use of call signs is regulated by government agencies to ensure proper identification and communication in the relevant industries.
The use of call signs for commercial purposes may be subject to specific regulations and licencing requirements.
In some cases, you may be able to request a change to your call sign, but it is subject to approval and availability.
There may be restrictions on the use of call signs, such as prohibitions on using misleading or offensive call signs.
If you believe your call sign is being used without authorisation, you should report it to the relevant regulatory agency for investigation.
This site contains general legal information but does not constitute professional legal advice for your particular situation. Persuing this glossary does not create an attorney-client or legal adviser relationship. If you have specific questions, please consult a qualified attorney licensed in your jurisdiction.
This glossary post was last updated: 27th April 2024.
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