Free DV is open source software, released under the GNU Public License version 2.1.
The modems and Codec 2 speech codec used in Free DV are also open source.
Alternatively you can buy a SM1000 Free DV adaptor.
Speech is compressed down to 700-1600 bit/s then modulated onto a 1.25 k Hz wide signal comprised of 16 QPSK carriers which is sent to the Mic input of a SSB radio.
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