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I have had a number of QSO's using FreeDV on a Flex6700 and I am very grateful to FlexRadio and the codec developers for the time and effort put into this project, it has a lot of interesting potential.
I would like to make the following comments:
If the aim on your radio is to make a readable transmission using the narrowest RF bandwidth over a wide range of signal strengths, then it currently does a good job and shows a massive advantage over SSB for audio signal to noise ratios on weak signals.
However, if you want to take advantage of the 6000 series ability to produce the finest transmit audio quality around, then it has a long way to go yet in terms of development.
Currently, using a full 3 kHz TX audio bandwidth, and high quality 5 channel digital audio processing, you can produce using SSB, an undistorted clarity and intelligability of audio rivalling AM and approaching that of FM.
Whilst an RF bandwidth of 1400Hz on DV is a great achievement, it would be nice to hope that as the mode develops we might be able to improve the resulting audio bandwidth to around 4.5 kHz, whilst still maintaining an RF envelope somewhat less than the normally accepted 3.0 kHz.
G4BIM Isle of Wight U.K.
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