J in Morse Code: ·−−−
The letter J in Morse code is ·−−−, spoken as "di-DAH-DAH-DAH": one short, then three long. That is 1 dot and 3 dashes, with a dash held three times as long as a dot. To remember it, think in JAWS JAWS JAWS (one quick beat, then three long ones).
Timing: how long each part lasts
Morse timing is built from one unit, the length of a dot. A dash is 3 units, and the silence between the elements of a single character is 1 unit. At 20 words per minute, one unit is 60 ms, so J breaks down like this:
| Element | Signal | Length (units) | At 20 WPM |
|---|---|---|---|
| Dot | · | 1 | 60 ms |
| Gap | (silence) | 1 | 60 ms |
| Dash | − | 3 | 180 ms |
| Gap | (silence) | 1 | 60 ms |
| Dash | − | 3 | 180 ms |
| Gap | (silence) | 1 | 60 ms |
| Dash | − | 3 | 180 ms |
| Total for J | 13 | 780 ms | |
How to signal J
- Tap it: one short, then three long. A short is a quick tap; a long is a heavier tap, or a quick tap followed by a slight hold, about three times as long.
- Blink it: one short, then three long. Use quick blinks for dots and slow, deliberate eye closes for dashes, keeping the rhythm steady.
- Flash it: one short, then three long. Short flashes for dots; for dashes, hold the light on about three times longer. Any flashlight or phone screen works.
How to remember J
Say in JAWS JAWS JAWS (one quick beat, then three long ones) in rhythm with the code and the pattern sticks: "di-DAH-DAH-DAH".
Words that start with J: Juliett ·−−− ··− ·−·· ·· · − −, jar ·−−− ·− ·−·, jungle ·−−− ··− −· −−· ·−·· ·, jigsaw ·−−− ·· −−· ··· ·− ·−−. The first is J's NATO phonetic name, which operators use to spell aloud.
J is one of the rarest letters in English and carries one of the heaviest codes to match: a dot followed by three full dashes, among the longest letter codes to send.