Morse code: why the silence matters as much as the beep
Dots and dashes are only part of the system. Spacing tells a listener where a character or word ends.
Information through duration
International Morse represents letters and numbers with short and long signals. The dot provides the basic time unit. A dash lasts three units. Within a character, adjacent elements have a one-unit gap; characters are separated by three units and words by seven. These are total gaps, not additions to an existing pause.
Consider the letter A: a dot, one unit of silence and a dash. Two characters sent without their proper separating gap may be heard as a different character. The listener needs absence of sound as well as sound.
Which Morse system?
The early American system associated with Morse and Vail is not identical to modern International Morse. Our online activity uses the international letter and number code documented by the ITU. It should not be heard as a reconstruction of exactly how an operator sounded in 1844.
Explore without a transmitter
In the playground, type A–Z or 0–9, listen at a slower speed, then build a letter with the dot and dash buttons. Spaces separate words; the slash in the written display is a visual separator, not a transmitted slash character. Other characters are flagged instead of silently removed.
The tones are generated locally as teaching aids. They are not historical recordings or encrypted messages. Scores are a simple practice aid and reset when the page is reloaded.