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aicodix / rattlegram

Transceive UTF-8 text messages with up to 170 bytes over audio in about a second!
BSD Zero Clause License
161 stars 29 forks source link

C4FM problem #30

Closed Doug-F closed 6 months ago

Doug-F commented 7 months ago

Rattlegram doesn't work on Yaesu's C4FM, when it's fine on FM. We use a repeater that doesn't handle FM, can anything be done to make it work?

xdsopl commented 7 months ago

Digital voice transmission uses vocoder technology to improve human voice transmission clarity over noisy channels. On the other hand, Rattlegram uses OFDM technology to transmit a bandwidth limited signal, which does not resemble human speech but is okay with SSB, AM and FM. Transmitting data over a digital voice channel is a different kind of challenge.