Telegraph Key

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Telegraph Key

 

a simple transmitter of telegraph signals in Morse code; part of Morse telegraph equipment. The telegrapher manipulates a lever, which closes and opens a current-carrying circuit in a manner that corresponds with the transmitted message. The speed of transmission is 70–90 characters per min for regular keys and 120–150 characters per min for speed keys. Telegraph keys are used in radiotelegraph communications featuring manual processing of signals, especially by radio amateurs operating on shortwaves.

References in periodicals archive ?
Security instruction for the beacon took forty-five minutes, and presumably covered Eureka's low-probability of intercept, Morse key feature, and the set's self-destruction mechanism.
Difficulties monitoring Morse transmissions on Rebecca, together with mounting reports that Eureka operators on the ground were apparently tiring of the beacon's Morse keying requirement, may explain why Morse key security for the Eureka-Rebecca system fell into disuse on both ends of the system; and this at a time when "blind use," having already dispensed with the ground fire patterns and Morse flashlight signal security checks, would seem to demand its use.
The newsletter described the Eureka's purpose, range, and details such as its Morse key feature.