Hi Al,
I don't run the QSO.freedv.org website - you'll need to talk to the
maintainer.
SM1000 support for 700E is possible (it's about the same CPU as 700D),
if some one wants to work on it .... however it would be nice to get the
band pass filter running on the SM1000 to support the
clipper/compression. To date we've left the BPF out of the SM1000 due
to CPU, so some optimisation work required there.
- David
On 20/12/20 3:34 pm, Al Beard via Freetel-codec2 wrote:
*Thanks David,*
*
*
*I've recompiled the Codec2 library with the latest on my "parrot"
repeater.*
*(Fedora 30 armv7hl) (a Pi clone, Banana Pi M2 Berry)*
*But error:*
*/data/home/alanb/bin/parrot: undefined symbol:
freedv_get_uncorrected_errors*
*
*
*I'll look into that....*
*
*
*I've compiled the Ver 1.5 devel FreeDV GUI on Fedora 29 x86_64, my
"main" box.*
*
*
*We are having some good Sporadic E openings on 10m and 6m between
here and New Zealand.*
*
*
*Can we have some frequencies on the QSO.freedv.org website for bands
17m and up such that there*
*is a "standard" on each band?*
*
*
*Also, is there a possibility the SM1000 can run mode 700E?*
*
*
*Alan VK2ZIW*
*
*
*
*
*On Sun, 20 Dec 2020 13:50:33 +1030, David Rowe wrote*
> Thanks Walter and Mooneer. I'd be interested to know the RMS power
you can develop with 700D/E with the clipper option.
> - David
>
> On 20/12/20 10:30 am, Mooneer Salem wrote:
>
> Looks like it's working reasonably well, though the 20 meter band
fell out shortly after we all got it installed. More testing tomorrow
for sure. :)
>
> -Mooneer K6AQ
>
> On Sat, Dec 19, 2020 at 2:26 PM <[email protected]
<mailto:[email protected]>> wrote:
>
Have it loaded and running now.
>
> Working on a couple others as I type to get some end to end
testing.
>
> Many thanks David, and best of the holidays.
>
> Walter/K5WH
>
> -----Original Message-----
> From: David Rowe <[email protected] <mailto:[email protected]>>
> Sent: Saturday, December 19, 2020 3:34 PM
> To: [email protected]
<mailto:[email protected]>
> Subject: [Freetel-codec2] FreeDV 1.5 - 700E and OFDM compression
>
> I've been working on a new FreeDV 700E mode, and some
compression for FreeDV 700D and 700E to increase the average
power. A Christmas present for you to play with
>
> 700E is designed to handle fast fading like 700C, but like 700D
has powerful FEC. My bench tests indicate 700C & E are equivalent
on moderate fading channels (2Hz dopdler/2ms spread), but on very
fast fading (4Hz/4ms) 700E does better - 700C & D fall over. 700D
works better at lower SNRs on slow fading channels.
>
> I've also been testing against compressed SSB, which as Helmut
suggests is pretty hard to beat, as it's so robust to fading.
However 700E is hanging on quite well with fast fading, and
becomes noise free as the SNR increases.
>
> -/-
>
> The second innovation is compression of the 700C/D/E waveforms,
to increase average power significantly.
>
> Please be careful adjusting the Tx drive and especially
enabling the Tool - Options - Clipping. It can drive your PA
quite hard. I have managed 40W RMS out of my 75W PEP
transmitter. Make sure your transmitter can handle long periods
of high average power. My IC7200 and
> FT-817 seem OK.
>
> At the same equivalent peak power - 700D is doing well when
compressed SSB is -5dB SNR and rather hard on the ears.
>
> -/-
>
> Peter VK3RV, Jose LU5DKI, and Barry VK3BRT tried 1.5.0 last
night and report it works on real HF channels.
> The latest manual describes the new features:
>
>
https://github.com/drowe67/freedv-gui/blob/118cb66ee4679518185db871ec0ae68071c406a4/USER_MANUAL.md
>
> You can download Windows 32 and 64 bit versions of FreeDV 1.5
here:
>
> http://rowetel.com/downloads/freedv
>
> -/-
>
> I'd be interested in any feedback. If you have an interesting
test case (e.g. a bug or comparing SSB to FreeDV), pls send me
off air recordings of signals (FreeDV Tools-Record File from
Radio). That helps me make objective comparisons. Recordings are
much more useful to me than anecdotes or subjective reports.
>
> Thanks,
> David
>
> _______________________________________________
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>
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>
>
>
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Alan VK2ZIW
Before the Big Bang, God, Sela.
OpenWebMail 2.53, nothing in the cloud.
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