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  2. Morse code - Wikipedia

    en.wikipedia.org/wiki/Morse_code

    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. [ 3 ][ 4 ] Morse code is named after Samuel Morse, one of the early ...

  3. 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.

  4. Morse code mnemonics - Wikipedia

    en.wikipedia.org/wiki/Morse_code_mnemonics

    Morse code mnemonics are systems to represent the sound of Morse characters in a way intended to be easy to remember. Since every one of these mnemonics requires a two-step mental translation between sound and character, none of these systems are useful for using manual Morse at practical speeds. Amateur radio clubs can provide resources to ...

  5. Prosigns for Morse code - Wikipedia

    en.wikipedia.org/wiki/Prosigns_for_Morse_code

    Prosigns for Morse code. Procedural signs or prosigns are shorthand signals used in Morse code telegraphy, for the purpose of simplifying and standardizing procedural protocols for landline and radio communication. The procedural signs are distinct from conventional Morse code abbreviations, which consist mainly of brevity codes that convey ...

  6. Beat frequency oscillator - Wikipedia

    en.wikipedia.org/wiki/Beat_frequency_oscillator

    Beat frequency oscillator. In a radio receiver, a beat frequency oscillator or BFO is a dedicated oscillator used to create an audio frequency signal from Morse code radiotelegraphy (CW) transmissions to make them audible. The signal from the BFO is mixed with the received signal to create a heterodyne or beat frequency which is heard as a tone ...

  7. Wireless telegraphy - Wikipedia

    en.wikipedia.org/wiki/Wireless_telegraphy

    Wireless telegraphy or radiotelegraphy is the transmission of text messages by radio waves, analogous to electrical telegraphy using cables. [1][2] Before about 1910, the term wireless telegraphy was also used for other experimental technologies for transmitting telegraph signals without wires. [3][4] In radiotelegraphy, information is ...

  8. YYZ (song) - Wikipedia

    en.wikipedia.org/wiki/YYZ_(song)

    YYZ is the IATA airport identification code of Toronto Pearson International Airport, near Rush's hometown. The band was introduced to the rhythm as Alex Lifeson flew them into the airport. A VHF omnidirectional range system at the airport broadcasts the YYZ identifier code in Morse code. Peart said in interviews later that the rhythm stuck ...

  9. 16-line message format - Wikipedia

    en.wikipedia.org/wiki/16-line_message_format

    16-line message format. 16-line message format, or Basic Message Format, is the standard military radiogram format (in NATO allied nations) for the manner in which a paper message form is transcribed through voice, Morse code, or TTY transmission formats. The overall structure of the message has three parts: HEADING (which can use as many as 10 ...

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