<P> Morse code uses variable length sequences of short and long duration signals (dots and dashes) to represent source information e.g. sequences for the letter "K" and numeral "2" are respectively (▄ ▄ ▄ ▄ ▄ ▄ ▄ ▄ ▄ ▄ ▄ ▄) and (▄ ▄ ▄ ▄ ▄ ▄ ▄ ▄ ▄ ▄ ▄ ▄ ▄ ▄ ▄ ▄ ▄ ▄). This variability complicates the measurement of Morse code speed rated in words per minute . Using telegram messages, the average English word length is about five characters, each averaging 5.124 dot durations or baud . Spacing between words should also be considered, being seven dot durations in the USA and five in British territories . So the average British telegraph word was 30.67 dot times . So the baud rate of a Morse code is ​ ⁄ × word per minute rate . </P> <P> It is standard practice to use two different such standard words to measure Morse code speeds in words per minute . The standard words are: "PARIS" and "CODEX". In Morse code "PARIS" has 50 dot durations, while "CODEX" has 60 . </P> <P> Morse is still widely used by amateur radio operators (hams). Experienced hams routinely send Morse at 20 words per minute, using manually operated hand telegraph keys; enthusiasts such as members of The CW Operators' Club routinely send and receive Morse code at speeds up to 60 wpm . Twenty words per minute (20 wpm) represents the rough upper limit for Morse operators attempting to write down Morse code received by ear using paper and pencil . Many skilled Morse code operators can receive Morse code by ear mentally without writing down the information at speeds up to 70 wpm . To write down the Morse code information manually at speeds higher than 20 wpm it is usual for the operators to use a typewriter or computer keyboard to enable higher speed copying . </P> <P> The fastest Morse code operator was Theodore Roosevelt McElroy copying at 75.6 wpm using a typewriter at the 1939 world championship . </P>

How many wpm can the fastest typer type