IEVref:721-11-32ID:
Language:enStatus: Standard
Term: four-frequency duplex telegraphy
Synonym1: twinplex (US)
[Preferred]
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Definition: frequency-shift telegraphy in which each of the four possible combinations of signal elements corresponding to two telegraph channels is represented by a separate frequency

NOTE – Four-frequency duplex telegraphy is used in radiotelegraphy.


Publication date:1991-11
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