FreeDV digital voice
Open-source digital voice for HF hams, including the newer RADE mode built with machine learning.
ModeFreeDV digital voice
FamilyDigital voice
Audio exampleComing
What does it sound like?
Plate 16Digital voice
A steady rushing hiss about as wide as a voice signal, with no speech you can make out on an ordinary radio.
Field marksMany tones side by side (OFDM)About as wide as a voice signal or narrower14.236 MHz is the busiest spot
Who uses it?
Amateur radio operators who want clear, noise-free voice on the shortwave ham bands.
Where and when can I hear it?
Most often 14.236 MHz, with 7.177 and 28.330 MHz also common; busiest on weekends and during FreeDV activity days.
Easily confused with
- Single-sideband voice (SSB): plain SSB voice is understandable speech
- MT63: MT63 is text, not voice