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  2. Telegraph sounder - Wikipedia

    en.wikipedia.org/wiki/Telegraph_sounder

    Telegraph Sounder. A telegraph sounder is an antique electromechanical device used as a receiver on electrical telegraph lines during the 19th century. It was invented by Alfred Vail after 1850 to replace the previous receiving device, the cumbersome Morse register [1] and was the first practical application of the electromagnet.

  3. Acoustic telegraphy - Wikipedia

    en.wikipedia.org/wiki/Acoustic_telegraphy

    Acoustic telegraphy (also known as harmonic telegraphy) was a name for various methods of multiplexing (transmitting more than one) telegraph messages simultaneously over a single telegraph wire by using different audio frequencies or channels for each message. A telegrapher used a conventional Morse key to tap out the message in Morse code ...

  4. Morse code - Wikipedia

    en.wikipedia.org/wiki/Morse_code

    Chart of the Morse code 26 letters and 10 numerals [1]. This Morse key was originally used by Gotthard railway, later by a shortwave radio amateur [2]. Morse code is a telecommunications method which encodes text characters as standardized sequences of two different signal durations, called dots and dashes, or dits and dahs.

  5. Modulated continuous wave - Wikipedia

    en.wikipedia.org/wiki/Modulated_continuous_wave

    MCW can be generated by any AM or FM radio transmitter with audio input from an audio oscillator or equivalent audio source. [ 1 ] [ 2 ] When an SSB transmitter is modulated by Morse code of only a single audio frequency, the resulting radio frequency emission is J2A or J2B and therefore is CW by definition, not MCW.

  6. Computer aided transceiver - Wikipedia

    en.wikipedia.org/wiki/Computer_Aided_Transceiver

    DATA modes, and getting audio to and from the PC is the function of a DATA interface. A completely different thing but it is easier and more useful when CAT and DATA are used at the same time. Wouldn't it be nice to have an interface that could operate Frequency-shift keying (FSK), Audio FSK (AFSK), (real) Morse Code (CW), with a CAT interface ...

  7. High-speed telegraphy - Wikipedia

    en.wikipedia.org/wiki/High-speed_telegraphy

    In the five character groups event, random letters and numbers are sent in Morse code, five characters at a time, at a high speed. Separate competitions are held for the reception of just the twenty-six letters of the Latin alphabet , just the ten Arabic numerals , or a mixed content of letters, numbers, and some punctuation symbols.

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    mail.aol.com

    Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

  9. Continuous wave - Wikipedia

    en.wikipedia.org/wiki/Continuous_wave

    In military communications and amateur radio the terms "CW" and "Morse code" are often used interchangeably, despite the distinctions between the two. Aside from radio signals, Morse code may be sent using direct current in wires, sound, or light, for example. For radio signals, a carrier wave is keyed on and off to represent the dots and ...

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