V4 is a new data mode optimized for amateur radio keyboard contacts using Viterbi FEC and 4FSK modulation.
It is designed to provide good copy even in weak signal or poor propagation conditions.
V4 can be implemented on most computers using standard PC sound cards with radio interfaces.
An Alpha version of the software can be downloaded from the files section of the V4 Protocol Yahoo Group.
http://groups.yahoo.com/group/V4Protocol/V4 Protocol and V4 Chat document
http://www.winlink.org/webfm_send/169
Source : www.southgatearc.org
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