If you've been sending or copying Morse for more than a few weeks, you've already developed habits. The good ones compound into fluency. The bad ones get harder to unlearn at every higher speed. Here are the ten most common mistakes — from beginner clunkers to intermediate plateaus — with the specific fix for each.
1. Counting dots and dashes instead of hearing letters
Symptom: You stall at 8–10 WPM. Faster characters blur into "lots of dits" or "lots of dahs" and you lose count.
Why it's bad: Counting means three steps for every letter: count, translate, write. Ludwig Koch's 1936 study of Morse training found that this works at low speed but becomes unachievable as the speed rises.
Fix: Use the Koch trainer and start again at a character speed too fast to count (12 WPM or more) with only two letters, adding more at about 90% accuracy. Use Farnsworth spacing if you need thinking time, rather than slowing the characters down again.
2. Writing dots and dashes on paper
Symptom: You can decode by hand at 8 WPM but can't read a 15-WPM transmission without writing.
Why it's bad: Writing dots and dashes adds a translation step for every letter, and that step can't keep up as the speed rises. It also keeps you thinking in symbols rather than sounds, which makes head copy harder to reach.
Fix: Type what you hear. Letters in the buffer, not dits in the buffer. If your fingers want to write dots, sit on your hands and listen to one minute of slow-speed CW with no notes at all. Repeat daily until it stops feeling impossible.
3. Sloppy inter-letter gaps
Symptom: Other operators ask you to QRS even when your character speed is moderate, and decoders run letters together: send PARIS with the gap after the I too short, and I (..) plus S (...) becomes five dots, which is the digit 5.
Why it's bad: The inter-letter gap is the punctuation of Morse. Short gaps run two letters together; long gaps suggest a word break that isn't there. Both wreck readability.
Fix: Send the word PARIS into the live mic decoder ten times in a row. If it reads PARIS every time, your gaps are right. If letters merge (PAR5, for example), your letter gaps are too short; if letters split into pieces (A heard as ET), the gaps inside your letters are too long. Use the timing calculator to see the exact unit-ms target for your WPM, then count silently.
4. Inconsistent dah length
Symptom: Listeners confuse letters that differ only in a dot or dash: your A is copied as I, or your U as S.
Why it's bad: A dah should be three times as long as a dit. If your dahs are too short they start to sound like dits, so A (.-) turns into I (..) and U (..-) into S (...). If the length wanders, the listener has to guess.
Fix: Use the drill from the sending guide: send a letter many times in a row and listen for whether every dah is the same length. Record yourself and listen back, slowed down if your player allows it; uneven dahs are easier to spot that way. The keyer trainer scores your timing as you send.
5. Squeeze-keying iambic before you're ready
Symptom: You bought a paddle, you're at 14 WPM, and your sending sounds worse than it did on a straight key.
Why it's bad: Iambic keying generates dits and dahs automatically when both paddles are squeezed. Mistiming the squeeze inserts extra elements you didn't intend.
Fix: You don't have to squeeze. Many operators send with one paddle at a time, which gives exactly the elements you press. If you want to learn squeezing, practise it slowly on single letters such as C and K, and check your keyer's settings, since keyers differ in what they add when you release a squeeze. Courses such as CW Academy teach beginners on paddles from the start, so a paddle itself isn't the problem.
6. Calling at the wrong speed
Symptom: You CQ at 22 WPM (because that's what everyone else does) and only get answered by people you can't copy.
Why it's bad: The usual courtesy on amateur CW is that the answering station matches the calling station's speed (see our operating guide). If you call at 22 WPM, expect 22-WPM replies.
Fix: Call at the speed you can copy, not the speed you can send. Sending fast and copying slow is a frustrating mismatch every contact long.
7. Skipping the warm-up
Symptom: Your first three letters of every session are sloppy.
Why it's bad: Sending is a motor skill, and most people send less cleanly in their first minute than a few minutes in. Going on the air cold puts those errors into your first contact.
Fix: Spend two minutes warming up before each session. Send the alphabet at your target speed. Send PARIS ten times. Listen to a recorded CW QSO. Then go on the air.
8. Treating prosigns as letters
Symptom: You send S K (with a gap) instead of the joined prosign SK (no gap, one shape).
Why it's bad: A prosign is sent as one continuous pattern. With a letter gap in the middle, SK becomes the two letters S and K, which a listener has to work out from context, and a decoder will print as separate letters. Same with AR, BT and KN.
Fix: Drill the common prosigns, AR, BT, SK, KN and SOS, as single shapes. (K and R are used procedurally too, but they are single letters, so there is nothing to join.) The prosign reference shows each one's joined pattern.
9. Sending what you can't copy
Symptom: You send abbreviations like HW CPY or UR RST 599 = FB OM because that's what you've seen others send — but you can't decode them when sent back.
Why it's bad: Mismatch between your sending vocabulary and copying vocabulary causes mid-QSO panic. The other op sends an abbreviation back, you freeze, you ask for AGN, and the conversation collapses.
Fix: Build your sending and copying vocabularies together. Read the CW abbreviations reference and only send what you can also instantly recognize in return.
10. Not getting on the air
Symptom: You've been "practising" for six months but never made a real contact.
Why it's bad: No amount of solo practice substitutes for real on-air time. Pressure, noise, real signals, real abbreviations — these only exist in a real QSO. Practising alone forever optimizes for a test that doesn't exist.
Fix: Find slow CW on the air. Our operating guide lists the band-plan frequencies set aside for slow CW and clubs such as SKCC and FISTS that welcome slower operators. Make one contact, then another. Real contacts show you weaknesses that solo practice can't.
The mindset behind all ten
The common thread: practise the way you'll actually use Morse. Practise at the speed you want to operate at. Practise the way you'll listen on the air — typed, not written. Practise with the same abbreviations you'll send. Practise sending into a decoder that doesn't grade on a curve.
And go on the air. The point isn't to be perfect — the point is to have a conversation in dots and dashes with someone who's never met you. That's the whole hobby.