Morse Listener — FFT band detector + spectrogram
Default center:
800 Hz
. Use Auto-Lock if unsure.
Start
Stop
Clear
Auto-Lock
Home
WPM (speed):
20
Tone center (Hz):
800
Bandwidth (Hz):
100
Detection dB threshold (dB over noise floor):
8
dB
Smoothing window (ms):
60
ms
Live spectrogram (frequency vertical — low @ bottom)
Waveform (filtered signal)
FFT band power meter
Char count:
0
— Current:
—
— Pattern:
Decoded text
Tips: use Auto-Lock to find the tone (it listens for a strong peak). Then narrow bandwidth to just cover the stripe. If decoding seems to split dots/dashes incorrectly, increase smoothing or adjust WPM. For best results use a clean CW tone (sine).