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On–off keying is most commonly used to transmit Morse code over radio frequencies (referred to as CW ( continuous wave) operation), although in principle any digital encoding scheme may be used. OOK has been used in the ISM bands to transfer data between computers, for example. OOK is more spectrally efficient than frequency-shift keying, but ...
Audio frequency-shift keying (AFSK) is a modulation technique by which digital data is represented by changes in the frequency ( pitch) of an audio tone, yielding an encoded signal suitable for transmission via radio or telephone. Normally, the transmitted audio alternates between two tones: one, the "mark", represents a binary one; the other ...
v. t. e. Modulated continuous wave (MCW) is Morse code telegraphy transmitted using an audio tone to modulate a carrier wave . Continuous wave (CW), by contrast, does not use a subcarrier, so there is no emission at all between Morse code symbols. MCW can be generated by any AM or FM radio transmitter with audio input from an audio oscillator ...
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.
The FCC has finally dropped the requirement to learn the obscure language to become a ham radio operator; up until now there had been a five word per minute minimum Morse code speed requirement in ...
A telegraph key or Morse key is a specialized electrical switch used by a trained operator to transmit text messages in Morse code in a telegraphy system. 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 ...
The Morse Code Translator, which does exactly what you expect it to do. It converts plain text to Morse code and vice versa. Might come in handy if you're ever stranded on a Mac Mania Geek Cruise ...
The series premiere delves into the history of telecommunications, starting with Morse code and how it paved the way for more recent innovations such as smartphones, 3G, 4G and ...