Call sign
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In broadcasting and radio communications, a call sign is a unique identifier for a transmitter station. 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.
Russian nuclear icebreaker Arktika with call sign UKTY
All U.S. states issue call sign license plates upon request for motor vehicles owned by amateur radio operators. This road vehicle is from California.
Department of Commerce callbook, 1919
KDKA (AM)
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KDKA is a Class A, clear channel, AM radio station, owned and operated by Audacy, Inc. and licensed to Pittsburgh, Pennsylvania, United States. Its radio studios are located at the combined Audacy Pittsburgh facility in the Foster Plaza on Holiday Drive in Green Tree, and its transmitter site is at Allison Park. The station's programming is also carried over 93.7 KDKA-FM's HD2 digital subchannel, and is simulcast on FM translator W261AX at 100.1 MHz.
Photograph of the 9th floor KDKA transmission room. c. 1921
As part of ongoing facility upgrades, this well-appointed studio went into service on December 18, 1922.
KDKA microphone