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The Gerke code had a distinct advantage for use on undersea telegraph cables. Cables suffer from a type of distortion called dispersion that gets progressively worse with the length of the cable. Dispersion severely limits the rate that Morse can be sent because of intersymbol interference.
A Bowden cable (/ ˈ b oʊ d ən / BOH-dən) [1] is a type of flexible cable used to transmit mechanical force or energy by the movement of an inner cable relative to a hollow outer cable housing. The housing is generally of composite construction, consisting of an inner lining, a longitudinally incompressible layer such as a helical winding or ...
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.
The procedure signs below are compiled from the official specification for Morse Code, ITU-R M.1677, International Morse Code, [1] while others are defined the International Radio Regulations for Mobile Maritime Service, including ITU-R M.1170, [8] ITU-R M.1172, [4] and the Maritime International Code of Signals, [5] with a few details of their ...
In cases of slow responding AGC circuitry operators may accept the thumping noise and loss of AGC functionality and choose to turn their receiver AGC function off, instead operating their receivers using only manual gain control during QSK operation. Morse code operators aspiring to the convenience and conversational fluency of Morse code QSK ...
The Wheatstone slip was a paper tape that contained holes in a pattern to control the mark and space signals on the telegraph line. The paper tape was from 0.46 to 0.48 inches in width, (but the standard width is from 0.472 to 0.475 inches) and a standard thickness of 0.004 to 0.0045 inches. [3]
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 .
The second reason is that American Morse is more prone to intersymbol interference (ISI) because of the larger density of closely spaced dots. This problem was particularly severe on submarine telegraph cables, making American Morse less suitable for international communications. The only solution an operator had immediately to hand to deal ...
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