Hi David,
Big success!
Freedv-gui-brad-2020 is running on Ubunti 18.04 on my new I5-8xxx. I am
having SNR 20 in mode 2020 in closed loop and on 20m to the websdr in PA
and G above S7 I got full decoding. Just QSB below S7 is kind of a
problem. Also tuning is not as easy as in the other modes. So I first
had to tune to mode 1600 and than switch to 2020. The audio was
connected by simple cables between the Linux and the PC running HPSDR.
Made also a first try for satellite work:
First I was using a LimeSDR-USB for transmitting on 2,4 GHz using
SDR-Console. I recognized a problem in the transmission chain as there
were interuptions in the audio in both modes 1600 and 2020. Never had
that before, but changed recently to the new Version 3.0.9 of
SDR-Console. Have to check again with earlier version.
I than changed to DATV-Express hardware and software for SSB. No
dropouts, good decoding on 2,4 GHz in mode 1600, but very difficult to
get the right tuning in mode 2020. But got SNR 16 in closed RF-loop
within the shack. I think at that frequencies the signal jitter and
thermal drift is quite serious. Will go on with TX to the satellite and
receive by WEBSDR with GPSDO control.
First part of tests over satellite no finished. DATV-Express-Card is
drifting to much and with LimeSDR I burned my preamplifier. So I fired
up my 70cm to 13cm converters. First one was from DX-patrol. This one is
also drifting too much and would need a change in hardware with external
reference. The other one is from SG-Labs. His one is quite stable, just
some jitter is to hear in CW. This one is having the possiblility for
having an external reference. Will now hook up the audio from freedv to
the FT-897 and go on with my tests.
I think it would be helpfull to have pilot tones in mode 2020, same as
in mode 1600, to scope with those unstabilities on microwave. A few
Hertz more in bandwith would not be any problem at this frequencies.
Audio quality was PERFECT!!
Thank you for your work. If I can help with further test, please let me
know. I am ready for skeds on shortwave now.
Regards
Gerhard OE3GBB
Am 12.05.2019 13:10, schrieb David Rowe:
> Hi Gerhard,
>
> Those sorts of messages to the Linux console are quite normal, just some
> debug stuff the sound card library prints out.
>
> Cheers,
> David
>
> On 12/05/19 18:06, [email protected] wrote: Hi David,
>
> After installing freedv-gui-brad-2020 I wanted to configure a second
> sound card. But I get following message:
>
> oe3gbb@oe3gbb:~/freedv-gui-brad-2020$ ./build_linux/src/freedv
> Server listening at 0.0.0.0:45116
> pos 1 1
> EXCHANGE_DATA_IN:
> g_nSoundCards: 2
> g_soundCard1InDeviceName: HDA Intel PCH: ALC892 Analog (hw:0,0)
> g_soundCard1OutDeviceName: HDA Intel PCH: ALC892 Analog (hw:0,0)
> g_soundCard1SampleRate: 44100
> g_soundCard2InDeviceName: Logitech USB Headset: Audio (hw:1,0)
> g_soundCard2OutDeviceName: Logitech USB Headset: Audio (hw:1,0)
> g_soundCard2SampleRate: 44100
> rxInAudioDeviceName: HDA Intel PCH: ALC892 Analog (hw:0,0)
> rxOutAudioDeviceName: Logitech USB Headset: Audio (hw:1,0)
> txInAudioDeviceName: Logitech USB Headset: Audio (hw:1,0)
> txOutAudioDeviceName: HDA Intel PCH: ALC892 Analog (hw:0,0)
> freedv_get_n_speech_samples(g_pfreedv): 2880
> freedv_get_speech_sample_rate(g_pfreedv): 16000
> ALSA lib pcm.c:2495:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.rear
> ALSA lib pcm.c:2495:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.center_lfe
> ALSA lib pcm.c:2495:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.side
> ALSA lib pcm_route.c:867:(find_matching_chmap) Found no matching channel map
> ALSA lib pcm_route.c:867:(find_matching_chmap) Found no matching channel map
> ALSA lib pcm_route.c:867:(find_matching_chmap) Found no matching channel map
> ALSA lib pcm_route.c:867:(find_matching_chmap) Found no matching channel map
> fifoSize_ms: 440 infifo1/outfilo1: 19404 infifo2/outfilo2: 19404
> rxFifoSizeSamples: 3290
>
> I tried with two different USB headsets, result both the same. These are
> relatively old. Could that be the reason?
>
> Regards
>
> Gerhard OE3GBB
>
> Am 12.05.2019 08:08, schrieb David Rowe:
>
> Hello,
>
> There's been steady progress on FreeDV 2020 lately:
>
> http://www.rowetel.com/?p=6747
>
> This weekend, a few of us around Adelaide had 2020 QSOs to get a feel
> for the "user factors". There are a few bugs with sync and the Windows
> build left to work through. Speech quality is very good.
>
> In other news, a team of Hams have been working on the software
> engineering on Codec 2, in particular FreeDV 2020 and stm32:
>
> http://www.rowetel.com/?p=6725
>
> Cheers,
> David
>
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