Stream decoding
Live over-the-air CW terminal. Feed it your rig's audio, or run a test sample to see it work before the hardware arrives.
Nothing decoded yet. Pick a source below and press Start — or click a test sample.
Narrow to reject QRM; widen for fast code or a drifting signal. 100 Hz suits most 15–30 WPM copy.
Auto tracks the noise floor and the signal peak and keys halfway between them, with a constant-false-alarm gate against noise bursts. Raise the squelch on a noisy band, lower it for weak signals.
How it works: the audio is mixed to the centre pitch and integrated over a window set by the bandwidth (a sliding single-bin Goertzel detector, as in the QCX/QMX), the envelope is keyed against an adaptive noise-floor/peak threshold, and element lengths are clustered into dits and dahs so the speed tracks the sender. Letters print as soon as the gap after them exceeds the letter boundary. Unknown patterns print as a dot.