The ratio of dot length to dash length in Morse code is 1:3, not 1:4 as in this tutorial. (See any book on Morse code, or Wikipedia.), the interletter spacing is three dot lengths (750 ms in the example) and the interword space is 7 dot lengths. SOS is a "prosign" (see Wikipedia article) so letter …

Error in http://arduino.cc/en/Hacking/LibraryTutorial

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