Free tool · runs in your browser

Random CW practice generator

Real on-air shapes — not random letter groups. Generate a full QSO opening, a CQ call, a contest exchange, or a closing line with random but realistic call signs, names, locations, and signal reports. Copy it for practice text or play it as audio at your target WPM.

Koch trainer CW operating reference

Pick a shape

Full QSO opening Their call, your call, RST, name, QTH, HW? BK CQ call CQ CQ CQ DE <call> K Contest exchange 5NN plus serial or state — under 10 seconds on air Closing TNX FB QSO <name> 73 ES GL SK

Audio speed 18 WPM

Generated text

Click "Generate" to start.

How to use it

A real practice routine

Generate a QSO opening. Copy what you see to paper. Speak it aloud the way it would sound — the call, the DE, the RST. This trains the *shape* before the rhythm.
Hit Play. Listen with eyes closed. Don't write. Just identify the shape: "that was a CQ", "that was an exchange".
Generate three more at the same WPM. After 5 minutes you'll start hearing the boundaries between elements automatically.
Bump WPM up by 1. Repeat. The audio renderer respects WPM exactly so your training matches what real on-air operators send.
Once 22 WPM feels natural, open the operating reference, find a slow-speed net, and call CQ for real.

Other practice surfaces

Koch audio trainer Flashcards (visual + audio) Translator Decoder Timing calculator CW operating reference CW abbreviations Q-codes