[Elecraft] K3 Digital Voice Mode - our future?

[Matthew Cook]

Just to make sure we carry some Elecraft content you might like to look at
the following URL's

http://www.rowetel.com/blog/?p=4584
http://www.areg.org.au/?p=1719

And the code for both the Codec2 and FreeDV is freely available here;

https://github.com/freedv

73

Matthew
VK5ZM


On 18 September 2015 at 14:23, Walter Underwood <wunder at wunderwood.org>
wrote:

> FreeDV is open source. You can use the FreeDV API (
> http://www.rowetel.com/blog/?p=3469 <http://www.rowetel.com/blog/?p=3469>)
> or get a box that will implement it and can be updated with new protocols (
> http://www.rowetel.com/blog/?page_id=3902 <
> http://www.rowetel.com/blog/?page_id=3902>). Or you can download the
> FreeDV app. Or download the source, either one from here:
> http://freedv.org/tiki-index.php <http://freedv.org/tiki-index.php>
>
> Dave Rowe (VK5DGR)  is actively improving both the HF and VHF variants of
> FreeDV, with very interesting articles on his blog. He’s working on a low
> bitrate version for nasty HF signal paths (FreeDV 700), and is working on a
> VHF digital voice mode with two levels of fidelity always transmitted. When
> you get more signal, you get more fidelity (
> http://www.rowetel.com/blog/?p=3931 <http://www.rowetel.com/blog/?p=3931
> >).
>
> Here are some samples of the current 700 bitrate codec:
> http://www.rowetel.com/blog/?p=4291 <http://www.rowetel.com/blog/?p=4291>
>
> And some A/B comparison QSOs with SSB and FreeDV:
> http://www.rowetel.com/blog/?p=4527 <http://www.rowetel.com/blog/?p=4527>
>
> Dave is doing some very exciting stuff, I’m impressed. And it’s all free.
>
> wunder
> K6WRU
> CM87wj
> http://observer.wunderwood.org/ (my blog)
>
> > On Sep 17, 2015, at 8:41 PM, Don Wilhelm <w3fpr at embarqmail.com> wrote:
> >
> > There are advantages to digital voice, but for Amateur Band use, I don't
> think we are "there yet".  When we see an 'open source' digital voice mode
> that is published and can be implemented by any amateur, then I may change
> my position, but that is not the situation today.  I do not believe that
> proprietary modes of any sort should be permitted on the ham bands.
> >
> > One characteristic of digital streaming 'anything' is that if the signal
> 'loses sync', things go to pot, and you have to wait until it syncs up
> again.  With fading on an analog signal, you can usually fill in the gaps,
> but with digital, it is all or nothing.  When it is "all", it is great, but
> the gaps are annoying - plus the quality is determined by the bit rate in
> the encoding/decoding algorithms.
> >
> > 73,
> > Don W3FPR
> >
> > On 9/17/2015 11:16 PM, Sandy wrote:
> >> I could not agree more Don!   There isn't much advantage for amateur
> radio to digital voice operations.   Just another "kink in the wire"!
> >> No advantage at all.  All the digital voice stuff I have heard sounds
> terrible at times.  Motorola's system (proprietary no doubt!) can sound
> >> absolutely awful when signal conditions are bad.
> >>
> >
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