Robust Ham Radio Digital Voice

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Robust Ham Radio Digital Voice

In his blog David Rowe VK5DGR describes his work on increasing the robustness of FreeDV over HF radio channels, in particular compared to analog SSB

He says HF radio channels are bad news for digital data so he has been trying a dramatically reduced bit rate of just 450 bps and coherent QPSK instead of differential QPSK.

Read the blog at


via Robust Ham Radio Digital Voice


Interesting article from experimenter David Rowe (VK5DGR).  Rowe is trying to improve what he calls the “robustness” of Free DV over HF radio.  To do this, Rowe is dropping the bit rate to 450 bps and employing Coherent QPSK rather than Differential QPSK.  His research is promising.  Rowe supplies a link to his blog where his experiments are recorded.  A little complex in places, but mostly understandable to math-phobics such as I.

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Aloha es 73 de Russ (KH6JRM).

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