Telegraph key

This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. Find sources: "Telegraph key" – news · newspapers · books · scholar · JSTOR (December 2024) (Learn how and when to remove this message)

Telegraph key

A straight key style of telegraph key – model J-38, a key used by U.S. military during World War II, and frequently re-used by radio amateurs
Type	Switch
Electronic symbol

A telegraph key, clacker, tapper or morse key is a specialized electrical switch used by a trained operator to transmit text messages in Morse code in a telegraphy system.^[1] Keys are used in all forms of electrical telegraph systems, including landline (also called wire) telegraphy and radio (also called wireless) telegraphy. An operator uses the telegraph key to send electrical pulses (or in the case of modern CW, unmodulated radio waves) of two different lengths: short pulses, called dots or dits, and longer pulses, called dashes or dahs. These pulses encode the letters and other characters that spell out the message.