CW · practice room

The Key.
Learn it by ear.

The trainer I use while the permit is on its way. Every character comes as sound first and as a shape second, and behind each character sits a phrase whose rhythm is the code: an English one for everybody, and the Russian word I learned it by at fourteen. The Koch method, properly: timed sessions of five-character groups at full character speed, a new character at 90 percent, the pace rising only when you are ready. Then the real thing: whole contacts, contest exchanges, plain text in your head, and a band that hisses and fades like 40 metres at night. Underneath everything runs the dit train, and the page shows you whether you are on it.

Copied today0chars
Accuracy today0%
Characters open2of 40

Today's ten minutes

Day 1 · no sessions yet
1
Warm-up · 2 minSingle characters, the weak ones first. Ears on, no pressure.
2
Groups of five · 5 minThe course itself. Ninety percent over the session opens the next character.
3
Callsigns · 3 minReal contest callsigns made of the characters in play; all forty in the end. The exam you will actually take on the air. Opens with the first digit, the 27th character.
3:00session
Press Start for a timed session, or Play for free practice.
KMKMKpress Play, then type what you hear
Rhythm20 wpm · 12 effective
After you answer, each character you missed shows its word here.

Type the five characters; the group is checked as soon as the fifth one lands. Enter replays while the field is empty and submits a shorter answer otherwise. Two characters to begin with, K and M, at full speed: that is the method, not a bug.

Character speed20 wpm
Farnsworth spacing12 wpm effective
Tone640 Hz
More: band conditions and crutches
Band conditionsNoise through a filter at your tone, slow fading, someone sending nearby.
Crutches
Anonymous statsWhat leaves this browser when a session ends: a random id, the mode, the numbers per character, your speeds. No name, no callsign, no address. Everyone's results tune the order and the weights for the next person.
Lesson
Koch order. A groups session at 90 percent opens the next character by itself; step back here if you opened too many too soon.

Forty lamps. Each one lights when a character stops being a puzzle.

unseenlearningin playnext intime to recognise

Tap any lamp to hear its character and see the word. The small time in the corner is how long you take to recognise it after the sound ends: green under 0.7 s, amber under 1.4 s, red slower; the trainer leans on the slow and the missed ones by itself. The order is Koch's, letters first, then the digits, the four signs last. A character opens when a groups session ends at 90 percent or better, or when you add one yourself under More. Progress and settings stay in this browser; the only thing that leaves it is the anonymous session summary under More, and only while that switch is on.

Thirty days. What the ears did, one bar a day.

characters copiedaccuracy
Sessions0
Days practised0
Effective speed12wpm

Speed rises by one effective word per minute after three groups sessions in a row above 95 percent, up to the character speed. Slow down the spacing yourself if it starts to hurt; the character speed stays where it is.

Carry it with you

Everything here lives in this browser. Download your progress as a small file, keep it anywhere, and load it back on this or any other device: the lamps, the sessions, the chart and your settings continue where they stopped.