What is J in Morse code?

J in Morse code is ".---", spoken di-dah-dah-dah. It is four elements long (dot dash dash dash) and takes 780 milliseconds to send at 20 words per minute. It sits four steps from the root of the Morse code tree.

Which Morse code characters are confused with J?

J (.---) is easy to confuse with B (-...), its mirror image with dots and dashes swapped, and with P (.--.), each of which differs from it by a single element. Practise them back to back until the difference is a sound rather than a count.

How do you learn J in Morse code?

By its sound, not its shape: J is spoken di-dah-dah-dah. Listen to it at full speed instead of counting its elements. MorseForge's 7-day plan teaches it on day 5, together with H, V, F, L and P.

Reference plate · Letter 10 of 26

J in Morse code

J in Morse code is ".---": one dot followed by three dashes, spoken "di-dah-dah-dah". It is one of the 12 four-element letters, so it sits four steps from the root of the Morse code tree, and it is the mirror image of B, which is dash-dot-dot-dot. The 7-day plan teaches J on day 5. At 20 words per minute it takes 780 milliseconds to send.

Letter J4 elements

di-dah-dah-dah

Code: ·−−−
At 20 WPM: 780ms
Plan day: 5

J · di-dah-dah-dah

dot dash dash dash

~0.8s

Speed20 WPM

Practise J Send it on the key

J at a glance

Morse code: .---
Spoken: di-dah-dah-dah
Elements: 4: one dot and three dashes
At 20 WPM: 780 ms
At 5 WPM: 3120 ms
Morse tree: 4 steps from the root, below W
Mirror image: B
One element away: P
7-day plan: Day 5, with H, V, F, L and P
Koch order: 14 of 36

Where J sits in the Morse code tree

The path through the Morse code tree to J: from the root, a dot to E, a dash to A, a dash to W then a dash to J.

In the Morse code tree a dot branches left and a dash branches right, so every character sits exactly where its own code leads. J sits four steps from the root, directly below W. No letter hangs below J: it is a leaf of the tree.

See the whole Morse code tree

Characters confused with J

J is easiest to mistake for B or P. Practise them back to back until the difference is a sound rather than a count.

How to learn J

7-day plan

The plan teaches J on day 5, together with H, V, F, L and P. Learn it by its sound, "di-dah-dah-dah", at full speed rather than by counting its elements.

In the Koch method it is character 14 of 36.

Practise

Practice brings J back just before you would forget it, in all three skills: copying it by ear, reading it, and sending it yourself.

Guided lessons Practice

Questions about J in Morse code

What is J in Morse code?: J in Morse code is ".---", spoken di-dah-dah-dah. It is four elements long (dot dash dash dash) and takes 780 milliseconds to send at 20 words per minute. It sits four steps from the root of the Morse code tree.
Which Morse code characters are confused with J?: J (.---) is easy to confuse with B (-...), its mirror image with dots and dashes swapped, and with P (.--.), each of which differs from it by a single element. Practise them back to back until the difference is a sound rather than a count.
How do you learn J in Morse code?: By its sound, not its shape: J is spoken di-dah-dah-dah. Listen to it at full speed instead of counting its elements. MorseForge's 7-day plan teaches it on day 5, together with H, V, F, L and P.

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