Call Sign

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 transmitting station. In North America they are used as names for broadcasting stations. A call sign can be formally assigned by a government agency, informally adopted by individuals or organizations, or even cryptographically encoded to disguise a station's identity.

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. This pattern continued in radiotelegraph operation; radio companies initially assigned two-letter identifiers to coastal stations and stations aboard ships at sea. These were not globally unique, so a one-letter company identifier (for instance, 'M' and two letters as a Marconi Station) was later added. By 1912, the need to quickly identify stations operated by multiple companies in multiple nations required an international standard; an ITU prefix would be used to identify a country, and the rest of the call sign an individual station in that country.

Call signs are also used for air traffic control communication with airplanes and manned spacecraft.

Read more about Call SignInternational Series, Ships and Boats, Aviation, Spacecraft, Amateur Radio, Broadcast Call Signs, Military Call Signs, Transmitters Requiring No Call Signs

Other articles related to "call, calls, call sign, call signs":

Steal The Bacon - Rules
... Players are assigned a call-sign, often a number, which is shared by a member of the opposing team ... A referee calls out the call-sign, and the team members who have that call-sign must run to the center, grab the bacon, and return to their teammates without being tagged by the other player(s) with ... The referee may call out more than one call-sign resulting in many pairs of players, each player attempting to steal the "bacon" ...
Transmitters Requiring No Call Signs
... No call signs are issued to transmitters of long-range navigation systems (Decca, Alpha, Omega), or transmitters on frequencies below 10 kHz, because frequencies below 10 kHz are not ... and broadcast radio signals (Citizen's Band, Part 15 or ISM bands) are permitted an international call sign is not issued to such stations due to their unlicensed nature ... is considered a matter of etiquette to create one's own call sign, which is called a handle (or trail name) ...
Soyuz TMA-21 - Call Sign
... of Soyuz TMA-21 selected Tarkhany as their call sign of respect for Mikhail Lermontov's work ...
CKOR - History
... CKOK-FM changed its call sign to CKOR-FM and in 1986 to its present call sign of CJMG ... CKOK adopted its present call sign of CKOR (taken from the former calls of its FM sister) in 1991 ...
Titanium Rain - Characters - Phoenix Squadron
... Call Sign - Space Case Captain William Schilling F35X HellcatII pilot for the US Air Force ... Call Sign - PiSO 1st LT ... Call Sign - Happy Major Paul Graves ...

Famous quotes containing the words sign and/or call:

    An evil and adulterous generation asks for a sign, but no sign will be given to it except the sign of the prophet Jonah.
    Bible: New Testament, Matthew 12:39.

    Your hooves have stamped at the black margin of the wood,
    Even where horrible green parrots call and swing.
    My works are all stamped down into the sultry mud.
    William Butler Yeats (1865–1939)