Morse Code Practice
Practise Morse code four ways. Receive: hear groups of five and type what you hear, the Koch way. Quiz: hear a sign and pick it from four. Send: key letters with a straight key and see your rhythm drawn. Progress: your level and a backup file. Everything stays in this browser.
Progress lives only in this browser. Safari may erase site data after 7 days without a visit. Download a backup or add the site to your Home Screen.
Receive: the Koch trainer
Press Start and type each sign as you hear it. Do not stop to think: if a sign escapes you, leave it and catch the next one.
Letters at full speed, longer gaps between them.
Three sessions in a row under 70%. Lower the overall speed for a while, and keep the letter speed.
| Sign | Sent | Right |
|---|
- Sent
- You typed
Quiz: hear it, pick it
20 signs. Listen, then choose the one you heard, or type it. The wrong choices sound alike on purpose: B and 6, V and 4, A and N.
Send: the straight key
Hold the key for a dah, tap it for a di. Use your key on the keyboard or the large key below. Send the sign shown, and the page reads it back.
Send
Read back
Bluetooth headphones add delay. Use the speaker or wired headphones to key in time.
Progress
Your level and sessions stay in this browser only. Download a backup now and then, and load it on another device to carry on there.
No sessions yet. Your first one starts the record.
- Level
- Sessions
- Last
On an iPhone or iPad the file opens in a preview: tap Share, then Save to Files.
Replace drops what this browser holds. Merge keeps the higher level and adds up the counts.
§ 1How the level moves
You start with two signs, K and M. When one session has at least 100 signs and you copy 90% of them, the next sign joins. A shorter session still counts in your record, but it cannot move the level: ten signs right out of ten prove less than ninety out of a hundred.
If three sessions in a row stay under 70%, the page suggests a slower overall speed. The level never drops by itself. You can choose any level by hand.
§ 2Two speeds
Each letter is sent at the letter speed, 20 WPM by default, so it keeps the sound it has on the air. The gaps between letters are longer, so the overall speed is lower, 10 WPM by default. This is Farnsworth spacing.2
Raise the overall speed as you grow sure of the signs. Keep the letter speed: at 20 WPM you hear a letter as one sound, not as dots to count.
§ 3Where your progress lives
Your level, sessions and answers are kept in this browser only. The page sends nothing anywhere and has no account.
Safari may erase a site’s data after seven days without a visit, and a private window keeps nothing once closed. Download a backup in Progress now and then; load it on another device to carry on there.