Morse decoder pro12/15/2023 ![]() ![]() In the early decades of telegraphy, many efficiency improvements were incorporated into operations. One typical example of something which is not a recognized prosign but is yet recognizable is one or two freely timed dits at the end of a message, for OUT (the formal version being prosign AR, or ▄ ▄▄▄ ▄ ▄▄▄ ▄ ). There are specialised variations of the coding convention used in certain radio networks to manage transmission and formatting of messages, and many unofficial prosign conventions exist some of which might be ambiguous. As a prosign it is not really composed of the three separate letters S, O and S, but is run together as a single symbol of ▄ ▄ ▄ ▄▄▄ ▄▄▄ ▄▄▄ ▄ ▄ ▄ it is a sign in its own right. The most well-known example of the convention is the preamble to the standard distress call: SOS. In printed material describing their meaning and use, prosigns are represented by either a sequence of dots and dashes for the sound of a telegraph, or by an overlined sequence of letters composed of International Morse Code, which if sent without the usual spacing, sounds like the prosign symbol. ![]() Since telegraphy preceded voice communications by several decades, many of the much older Morse prosigns have acquired precisely equivalent pro words for use in more recent voice protocols. ![]() The development of prosigns began in the 1860s for wired telegraphy. They are individual and indivisible code points within the broader Morse code, fully at par with basic letters. Many of them are longer than typical characters and are rendered without intercharacter commas or pauses. Different from abbreviations, those are universally recognizable across language barriers as distinct and well-defined symbols.Īt the coding level, prosigns admit any form the Morse code can take, unlike abbreviations which have to follow letter form. In a more limited role the term refers to something akin to that of the nonprinting control characters in teleprinter and computer character sets, such as Baudot or ASCII. An example would be K for "okay, heard you, continue". In general prosigns are just standardised parts of short form radio protocol, and can include any abbreviation. They are separate from Morse code abbreviations, which consist mainly of brevity codes that convey messages to other parties with greater speed and accuracy. Procedural signs or prosigns are shorthand signals used in Morse code radio telegraphy procedure, for the purpose of simplifying and standardizing radio communication protocol. ![]()
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