What Is CW Morse Code?
CW stands for Continuous Wave — the radio transmission mode used to send Morse code. In amateur (ham) radio, CW refers specifically to Morse code sent via on/off keying of a radio carrier wave. When you press the key, the transmitter turns on (dot or dash); when you release, it turns off.
CW is highly valued in ham radio because it can be decoded at signal strengths far weaker than voice, requires minimal bandwidth, and has an active worldwide community. Many ham radio operators consider CW the purest form of radio communication.
Speed Levels — What to Aim For
WPM — Getting Started
Recognise all letters and numbers. Can decode simple words with visual aid. Goal for first 4–6 weeks of practice.
WPM — On The Air
Can hold a basic QSO (radio conversation). Copy callsigns and signal reports. Most CW contests use 15–20 WPM.
WPM — Expert
Head copy without writing. DX chasing and contest operation at full speed. Top operators reach 35–40 WPM.
The Koch Method — Most Effective Learning Approach
Developed by Ludwig Koch in 1930s Germany, the Koch method is the most scientifically proven approach to learning CW. It avoids the bad habits formed by starting slow.
Start at full speed (20 WPM)
Pick two characters (K and M are the traditional Koch starting pair). Practice at 20 WPM — the speed you want to end up at — not at 5 WPM. Starting slow creates a habit of counting dashes that you'll have to unlearn later.
Reach 90% accuracy before adding
Practice the current set until you can copy it with 90% accuracy in a 5-minute session. Only then add the next character. Never add a new character until the existing ones are solid.
Build the full alphabet progressively
Recommended Koch order: K M R S U A P T L O W I . N J E F 0 Y V , G 5 / Q 9 Z H 3 8 B ? 4 2 7 C 1 D 6 X. Add one character at a time following this order.
Use Farnsworth spacing
Farnsworth timing sends characters at full speed (20 WPM) but increases gaps between characters and words. This lets you hear each character correctly while giving your brain time to decode. Reduce Farnsworth spacing gradually as you improve.
Transition to head copy
Stop writing down every character. Aim to decode CW directly in your head — writing slows your brain down and limits speed. Train by listening to callsigns, then short words, then full sentences without writing.
Farnsworth Timing Reference
| Character Speed | Farnsworth | Effective WPM | Use Case |
|---|---|---|---|
| 20 WPM | ×4 gaps | ~5 WPM | Complete beginners — Koch week 1 |
| 20 WPM | ×3 gaps | ~7 WPM | Learning new characters |
| 20 WPM | ×2 gaps | ~10 WPM | Building confidence |
| 20 WPM | ×1.5 gaps | ~13 WPM | Pre-QSO practice |
| 20 WPM | ×1 (none) | 20 WPM | Full speed — on-air operation |
Practice With Our Tools
Practice CW — Full Translator
Use the speed slider and Farnsworth settings to practice at your target WPM. Toggle Telegraph Sounder for a more authentic CW sound.
Common CW Abbreviations & Q-Codes
Frequently Asked Questions
What is CW in ham radio?
CW stands for Continuous Wave — the Morse code transmission mode in amateur radio. The transmitter turns on for dots and dashes, off for gaps. CW can be decoded at much weaker signal levels than voice modes, making it excellent for long-distance (DX) communication.
Do I need to learn Morse code for a ham radio licence?
In most countries including the USA, UK, and Australia, Morse code is no longer required for any amateur radio licence. The ITU removed the mandatory CW requirement in 2003. However, many operators still learn it for the operational advantages and for the challenge.
How long does it take to learn CW for ham radio?
With 15–20 minutes of daily practice using the Koch method, most people can reach 13 WPM (enough for basic on-air operation) in about 3–4 months. Reaching 20 WPM for comfortable contacts typically takes 6–12 months of consistent practice.
What is the best speed to start learning CW?
The Koch method recommends starting at your target speed (usually 20 WPM) with extended Farnsworth gaps, rather than starting at 5 WPM. This prevents the habit of counting dashes, which limits your speed ceiling later.