tinyflex FLEX Encoder
https://github.com/theldus/tinyflex
Capcode (7-9 digits):
Message (max 248 characters):
0
/248 characters
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Encode Message
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▶ Play FLEX Audio
⏹ Stop
Continuous 2-FSK • 1600 bps • 2.4kHz ± 2.4kHz deviation • Smooth frequency modulation
Hexdump: