4 in Morse Code

Why 4 is interesting

Four has no standard cut-number alias — operators simply send the full four-dot-dash pattern even in contest exchanges. It’s the penultimate step before the all-dot 5.

Cultural and numerical context

Four is four dots, one dash — the last before the full-dot 5.

How to remember 4 in morse

“Almost all dots” — four taps and then one trailing dash, like a knock-knock-knock-knock-DOOR. Of the 1-through-5 group, 4 is the last one before you reach the all-dots completeness of 5; remember 4 as “5 minus its last dot replaced with a dash.”

Where you’ll hear 4 in real morse traffic

Four shows up in time-zone offsets (“UTC minus four” for Eastern Daylight Time), in band-edge frequencies (“the 40-meter band”), and in QSL card mailing addresses where 4-digit street numbers are common.

NATO & aviation phonetic for 4

“Four” in NATO. Aviation uses “fower” (sometimes spelled “fower-er”) — adding a syllable on the end so the word doesn’t get cut off in transmission and confused with “for.”

Practice tip for drilling 4

Because 4 has no cut-number alias, you can’t shortcut your way around it — drill the full pattern. The rhythm to internalize is “four short pulses, then one long”: di-di-di-di-DAH. It’s the only digit with a 4-to-1 ratio, which gives it a distinct ear-print once you’ve heard it a few hundred times.

How long 4 takes to send

Four 1-unit dits, one 3-unit dah, four gaps: 11 units, tied with its mirror 6 as the second-lightest digit in morse. Push the speed to 30 WPM (40 ms per unit) and the whole character clears in 440 ms. Because so much of 4 is dits, it compresses beautifully at high speed — the challenge isn’t its length but counting four fast taps accurately.

4 and 6, the lightest mirror pair

Backwards, ....- reads -.... — the digit 6. They’re the lightest of the four mirror pairs at 11 units each, and the pair most often fumbled in copy practice because the single dah hides at opposite ends of a blur of dots. The fix is rhythmic, not arithmetic: 4 ends on the long tone, 6 opens with it.

Four dots is H — four dots and a dash is 4

“What is the code for four dots?” is really a question about this digit. Four dots on their own are the letter H (....); add a dash and you have 4 (....-). Remove the first dot instead and ...- is V. Two single-symbol changes are worth knowing: turn the first dot into a dash and -...- is the break sign (BT, written =) that operators send between parts of a message; turn the fourth dot into a dash and you have 3 (...--). Three dots alone, the other common question, are S.

Four in numbers you will meet

The 4 in 143 stands for the four letters of “love” in pager shorthand; in morse the number is .---- ....- ...--. On the ham bands, the 40-metre band (7.0–7.3 MHz in the US) is a staple for morse contacts, and the 2-metre band starts at 144 MHz (.---- ....- ....-). Four is also one of the two digits most cut-number tables leave alone, so in a contest you will usually hear it in full: a quick four-dot run and a single closing dash.

All ten digits at a glance

• 0-----
• 1.----
• 2..---
• 3...--
• 4....-
• 5.....
• 6-....
• 7--...
• 8---..
• 9----.

See the full numbers explainer for why every digit is five elements, or the alphabet for letter codes.