FreeDV - Free Digital VoiceDigital Audio over HF SSB
FreeDV Resource Page
Speech is compressed down to 1600 bits/s then modulated onto a 1.25 kHz wide 16QPSK signal which is sent to the Mic input of a SSB radio. On receive, the signal is received by the SSB radio, then demodulated and decoded by FreeDV. Communications should be readable down to 2 dB S/N, and long-distance contacts are reported using 1-2 watts power.
FreeDV was built by an international team of Radio Amateurs working together on coding, design, user interface and testing. FreeDV is open source software, released under the GNU Public License version 2.1. The FreeDV modem and Codec 2 Speech codec used in FreeDV are also open source.
Latest Windows version
Join the new digitalvoice
Mailing List to chat with others and exchange ideas about using digitalvoice
Macintosh OS X
Debian package repository, Wheezy x86 and amd64
Red Hat Enterprise Linux repository set-up RPM
Red Hat Enterprise Linux 6 repositories, i686 and x86_64
Fedora repository set-up RPM
Fedora repositories, Fedora 17, 18, 19, i686 and x86_64
Groups and Help
Use the FreeDV Online Finder
to rendezvous with other users, see what frequencies they are using and
coordinate skeds (Broken - fixing it)
FreeDV / WinDRM / FreeDV Digital Voice Net follows at 3:00PM EDT, 1900 UTC , Winter 3:00PM EST 2000 UTC - 14.236 QRG USB.
About the Mailing List
This mailing list is provided to
discuss all topics related to digital voice transmissions
over the Amateur Radio HF spectrum.
Subscribe to digitalvoice / FreeDV
Browse Archives at
FreeDV - Free Digital Voice
Updated: 12-Jun-13 - firstname.lastname@example.org
Join the new digitalvoice Mailing List to chat with others and exchange ideas about using digitalvoice and FreeDV!