Yes its should be backwards compatible, so if it's a reproducible issue
we should fix it. IIRC I have a ctest that checks backwards
compatibility for 700D.
- David
On 21/12/20 9:13 am, Mooneer Salem wrote:
David, quick question. Is 1.5.0/1.5.1 supposed to be backwards
compatible with 1.4.3? At least a couple of people have reported that
received signals were garbled. (I recorded myself via a WebSDR earlier
today and was able to decode myself with 1.5.1, FWIW.)
-Mooneer K6AQ
On Sun, Dec 20, 2020 at 2:37 AM David Rowe <[email protected]
<mailto:[email protected]>> wrote:
Hi Al,
I don't run the QSO.freedv.org <http://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
<http://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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> [email protected]
<mailto:[email protected]>
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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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