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TECHNICAL GUIDE / SIGNAL RHYTHM

Morse Code Timing

Morse meaning depends on two things: the duration of a signal and the duration of silence around it. Correct timing turns marks into characters and characters into readable language.

STANDARD TIMING

Standard Morse timing ratios

Every Morse message uses the same 1–3–3–7 timing relationship.
  1. Dot1 unit

    One unit of signal.

  2. Dash3 units

    Three units of signal.

  3. Letter gap3 units

    Three units of silence.

  4. Word gap7 units

    Seven units of silence.

Figure: International Morse timing expressed with one shared base unit.

INTERACTIVE TIMING PLAYGROUND

See and adjust every Morse timing boundary

At 10 WPM, the standard dot unit lasts approximately 120 ms.
Dot1 unit120 ms
Intra-character gap1 unit120 ms
Dash3 units360 ms
Letter gap3 units360 ms
Word gap7 units840 ms

Standard 1–3–3–7 timing is active.

NEXT USEFUL STEP

Put Morse timing into practice

The dot as the base unit

Every duration begins with one timing unit. A dot occupies one unit. A dash occupies three. The ratio, not an absolute number of milliseconds, defines the symbol.

At a faster sending speed the unit becomes shorter, but the one-to-three relationship remains. This proportional model lets the same alphabet work from deliberate training speeds to rapid expert communication.

Three kinds of silence

The gap between dots and dashes within one character is one unit. The gap between complete characters is three units. The gap between words is seven units.

Silence is encoded structure. A three-unit pause inside a character may sound like a new character, while a word gap that is too short can merge separate words.

Calculating a unit from WPM

The PARIS convention defines one standard word as fifty timing units. This produces the familiar approximation that one dot unit in seconds equals 1.2 divided by words per minute.

At 12 WPM, a dot is about 100 milliseconds and a dash about 300. At 20 WPM, a dot is about 60 milliseconds. Calculate from one base unit so every mark and gap changes consistently.

Character speed and effective speed

Learners may benefit from characters played at a reasonably brisk internal speed while extra silence lowers the overall text rate. This preserves each character’s audible shape and reduces the temptation to count.

This approach is associated with Farnsworth spacing. An interface should distinguish character speed from effective message speed whenever both are adjustable.

Audio frequency and envelope

Pitch affects listening comfort but not Morse meaning. Many users find a mid-range sine tone clear, while individual hearing and equipment can make another frequency preferable.

A generated tone should avoid abrupt clicks with a short amplitude envelope without changing the standardized timing ratios.

Human sending variation

Real operators do not produce mathematically perfect marks. Small variation is normal, and experienced listeners recognize rhythm despite it.

Training should reward readability rather than machine-like rigidity. Record and replay sending, compare boundaries, and correct shortened word gaps or dashes that approach dot length.

Timing in audio decoding

A decoder estimates tone and silence regions, then clusters their durations into likely units. Noise, fading, echoes, clipped recordings, and changing speed can make that inference uncertain.

A trustworthy result shows detected Morse and confidence while keeping frequency or threshold controls secondary to a simple workflow.

Practice with timing

Choose a short word, hear it once, and tap its rhythm. Then inspect where marks end, where letters end, and where the word ends.

Use the interactive chart for isolated rhythms, the translator for custom text, and the speed test for controlled progression.

Sources and further reading

FURTHER READING

Related Morse code references