Why 7 is interesting
Seven is a particularly common digit in amateur radio because “73” is the universal sign-off for “best regards.” You’ll hear --... ...-- at the end of almost every CW QSO.
Cultural and numerical context
Seven is two dashes, three dots. Common in ham-radio sign-offs (“73” = best regards).
How to remember 7 in morse
“73” sign-off rhythm — seven’s morse pattern is the start of the most-sent two-digit number in ham radio history. Learn to hear “73” as one combined rhythm (“dah-dah-di-di-dit di-di-di-dah-dah”) and 7 alone slots into your ear automatically. The mirror of 7 (two dashes left, three dots right) is 3 (three dots left, two dashes right) — drill them as a complementary pair.
Where you’ll hear 7 in real morse traffic
“73” closes virtually every CW conversation between hams worldwide — meaning you’ll hear the digit 7 sent more than any other digit on amateur HF bands. Beyond that: the 70-cm UHF amateur band frequencies, contest serial numbers ending in 7, time references on the 7th of the month, and country prefix exchanges where 7-something callsigns indicate certain DX entities.
NATO & aviation phonetic for 7
“Seven” in NATO. Aviation uses the same word but pronounces the V crisply, since the SH-S transition can blur on a poor signal.
Practice tip for drilling 7
Train 7 specifically with the “73 sign-off drill”: at the end of every practice QSO (real or simulated), send “73 73 73” three times. The repetition under realistic context conditions builds the muscle memory faster than isolated digit drilling. Within a few weeks of regular CW practice, 7 should be the digit you hear most reliably.
How long 7 takes to send
Two 3-unit dahs, three 1-unit dits, four gaps: 13 units. At 25 WPM that’s 624 ms — and in the ham sign-off “73,” the 7 is actually the heavier half of the pair by sound, its two opening tones giving the farewell its characteristic weight before 3’s lighter dots close it out.
7 and 3: the sign-off mirror pair
Reversed, --... is 3 (...--) — which means the universal CW farewell “73” is, structurally, a digit followed by its own reflection. Both weigh 13 units. Sent together they make a satisfying rhythmic couplet: heavy-light, then light-heavy. It’s a happy accident of the code that ham radio’s best-known number pair mirrors itself.
Cut-number shorthand: G for 7
The cut G (--.) preserves 7’s two-dah opening and drops two of the three closing dits, saving 4 units of 13 — about 31%. Like V-for-3, it’s a moderate cut used mainly inside long numeric exchanges; the opening rhythm survives, so a practiced ear still hears “seven” in it.
All ten digits at a glance
See the full numbers explainer for why every digit is five elements, or the alphabet for letter codes.
Frequently asked questions
What is the number 7 in morse code?
The digit 7 in international morse code is "--..." — a five-element pattern like every other digit.
How long does 7 take to send in morse?
7 (--...) is 3 dits and 2 dahs, which with inter-element gaps totals 13 timing units — 780 ms at 20 WPM. Digits range from 9 units (5) to 19 units (0).
What's the cut-number alias for 7?
At high contest speeds, operators abbreviate 7 with the letter G, which is shorter in morse. This is called cut-number shorthand and is context-specific to fast CW operation.