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CW / Morse

On/off keyed carrier — Morse code. Extremely narrow, punches through noise better than any voice mode.

Bandwidth

~200 Hz

Category

beacon

Duty

Bursty

Best demod

CW

How it looks on a waterfall

A single hair-thin line blinking on and off in dot/dash rhythm.

Where you'll hear it

Ham CW, beacons, maritime NAVTEX-adjacent, emergency keying.

See it live

SPECTRA synthesises CW / Morse in your browser, so you can watch its waterfall signature and hear it demodulated without any radio hardware.

Open the live receiver →