QO-100 and SDR Console FT8
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Siegfried Jackstien
i homebrewed the tcxo modding in my lnb ... simon has the same stability now i built him a feed) i never had problems decoding ft4 or ft8 sidenote ... also voice sound much cleaner with a less wobbly lnb (and lower and slower corrections) can also be seen on the fixed tone on the cw beacon if you zoom
in with a high resolution dg9bfc sigi Am 10.10.2022 um 21:23 schrieb
dl9aj@...:
Hello all, |
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Hello Peter
Thanks' for your help with this problem.
I can confirm the change of LNB to the Bullseye has made FT8 100% workable on QO-100.
As Simon said earlier it had to be the stability of the LNB, thanks' to you and your recommendation I am a happy bunny!!!
Cheers
73
Ian G4GIR
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Peter Dudzinski
Hello all,
I had the same problem with FT8 and SDR Console. FT8 was not decodable. After a closer investigation i found out that this problem is dependent of the stability in the LNB. Unstable LNB`s need more correction of the middle beacon in the SDR Console. This made the FT8 signal undecodable. I changed my old LNB for a stable Bullseye LNB. Since then I don`t have any problems with receiving FT8. After a few minutes (warmup phase of LNB) FT8 can be decoded with and without correction of the center beacon. I contacted Ian G4GIR and recommendet this to him. The new Bullseye LNB gave him the same positive results. Vy 73 Peter DL9AJ |
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Peter Dudzinski
Hello all,
I had the same problem with FT8 and SDR Console. FT8 was not decodable. After a closer investigation i found out that this problem is dependent of the stability in the LNB. Unstable LNB`s need more correction of the middle beacon in the SDR Console. This make the FT8 signal undecodable. I changed my old LNB for a stable Bullseye LNB. Since then I don`t have any problems with receiving FT8. After a few minutes (warmup phase of LNB) FT8 can be decoded with and without correction of the center beacon. I contacted Ian G4GIR and recommendet this to him. The new Bullseye LNB gave him the same positive results. Vy 73 Peter DL9AJ |
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jdow
I wonder if the problem is the R820T(2) frequency synthesizer. It works by generating a frequency that is too high for a few counts and then by generating a frequency that is too low for a different number of counts. The average frequency is on, within a few Hz settability limits, but it has small deviations that may screw up FT8. Does the AirSpy R2 work? If it does that would eliminate the R820 synthesizer.
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{^_^} On 20191019 04:32:29, MVS Sarma wrote:
Some one could try with external supply to rtl sdr instead of onternal as it is said to be noisy. With external pure dc, one may be able to decode the ft8. |
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Hello Martin
Thanks for that information, it makes a lot of sense.
Will try what you have suggested.
Thanks
73
Ian G4GIR
From: Martin via Groups.Io
Sent: Saturday, October 19, 2019 5:41 PM
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] QO-100 and SDR Console
FT8 I
also suspect that it's a timing issue. Delay to the sat will be around 250mS and another 250 coming back. You also need to add the delay associated with the SDR into the equation. I actually measured some of these today for another forum. RSP1A & SDR Console V3
BW 10MHz Delay = 400mS
BW 500KHz Delay = 350mS
RSP1A & HDSDR
Zero IF 200KHz ADC 2MHz Decimation 8 Delay = 722mS
Zero IF 200KHz ADC 10MHz no Decimation Delay = 364mS
Zero IF 1536KHz ADC 2MHz no Decimation Delay = 575mS
Low IF 200KHz ADC 2MHz Decimation 4 Delay = 570mS
Low IF 1536KHz ADC 2MHz Decimation 4 Delay = 600mS
If you are using a web sdr or some form of streamed I/Q connection over the internet such as Console server or Spyserver you may need to add another 1 to 3 seconds delay depending upon network latency. I'd suggest that you turn off any NTP type PC clock sync and set your PC clock for a couple of seconds behind real time. Then see if you get any decodes, when you do, you can then look at the DT Delta Time offset value in WSPR or FT 8 and then fine tune the PC time to get DT values around 0 seconds. Regards, Martin - G8JNJ |
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Martin
I also suspect that it's a timing issue.
Delay to the sat will be around 250mS and another 250 coming back. You also need to add the delay associated with the SDR into the equation. I actually measured some of these today for another forum. RSP1A & SDR Console V3
BW 10MHz Delay = 400mS
BW 500KHz Delay = 350mS
RSP1A & HDSDR
Zero IF 200KHz ADC 2MHz Decimation 8 Delay = 722mS
Zero IF 200KHz ADC 10MHz no Decimation Delay = 364mS
Zero IF 1536KHz ADC 2MHz no Decimation Delay = 575mS
Low IF 200KHz ADC 2MHz Decimation 4 Delay = 570mS
Low IF 1536KHz ADC 2MHz Decimation 4 Delay = 600mS If you are using a web sdr or some form of streamed I/Q connection over the internet such as Console server or Spyserver you may need to add another 1 to 3 seconds delay depending upon network latency. I'd suggest that you turn off any NTP type PC clock sync and set your PC clock for a couple of seconds behind real time. Then see if you get any decodes, when you do, you can then look at the DT Delta Time offset value in WSPR or FT 8 and then fine tune the PC time to get DT values around 0 seconds. Regards, Martin - G8JNJ |
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Yes Mark I don't thing that would help.
There has to be someone able to decode, I have heard the signals, or at
least what sounds like FT8, the timings of each transmission stacks up with
FT8.
All good fun
73
Ian
G4GIR
From: Mark
Horn
Sent: Saturday, October 19, 2019 11:38 AM
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] QO-100 and SDR Console
FT8 Just
a thought could it be a timing issue? I believe there's a 2 second delay
in the transmission being received does FT8 still decode with such an offset in
time? Mark M0WGF |
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Mark Horn
Just a thought could it be a timing issue? I believe there's a 2 second delay in the transmission being received does FT8 still decode with such an offset in time?
Mark M0WGF |
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MVS Sarma
Some one could try with external supply to rtl sdr instead of onternal as it is said to be noisy. With external pure dc, one may be able to decode the ft8. All the best. On Sat, 19 Oct 2019, 4:55 pm G4GIR via Groups.Io, <i.frith=ntlworld.com@groups.io> wrote:
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Hi Gerhard
That is a good question!
Is there anyone out there able to decode FT8 from QO-100?
If so, your station setup would be of interest.
73
Ian G4GIR
From: gerhard@...
Sent: Friday, October 18, 2019 10:27 PM
To: main@sdr-radio.groups.io
Subject: Re: [SDR-Radio] QO-100 and SDR Console
FT8 Hi, do others also have problems decoding FT8, or just you? Just a remark. 73' Gerhard OE3GBB
Am 18.10.2019 23:14, schrieb G4GIR via Groups.Io:
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Ian,
My guess is that you need a very stable LNB for FT8.
Simon Brown, G4ELI https://www.sdr-radio.com
From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of G4GIR via Groups.Io
Sent: 18 October 2019 22:36 To: main@SDR-Radio.groups.io Subject: Re: [SDR-Radio] QO-100 and SDR Console FT8
Thanks Simon
The only thing I hadn't done in the screen shot was to lock to the PSK beacon (which I had been doing) I assume by locking to the beacon is not good enough for FT8?
The LNB is an Octagon OTLSO.
Thanks for the help.
73
Ian G4GIR
From: Simon Brown Sent: Friday, October 18, 2019 10:24 PM Subject: Re: [SDR-Radio] QO-100 and SDR Console FT8
Yes, and this looks good.
Problem could be that the LNB drifts to fast for the locking to keep it within 1 Hz. For FT8 I expect you’ll need a very good and stable LNB.
Simon Brown, G4ELI
From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of G4GIR via Groups.Io
Hi Simon
New territory for me, is this what you need?
73
Ian G4GIR |
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Thanks Simon
The only thing I hadn't done in the screen shot was to lock to the PSK
beacon (which I had been doing) I assume by locking to the beacon is not
good enough for FT8?
The LNB is an Octagon OTLSO.
Thanks for the help.
73
Ian G4GIR
From: Simon
Brown
Sent: Friday, October 18, 2019 10:24 PM
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] QO-100 and SDR Console
FT8 Yes, and this looks good.
Problem could be that the LNB drifts to fast for the locking to keep it within 1 Hz. For FT8 I expect you’ll need a very good and stable LNB.
Simon Brown, G4ELI https://www.sdr-radio.com
From:
main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of
G4GIR via Groups.Io
Hi Simon
New territory for me, is this what you need?
73
Ian G4GIR |
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Gerhard, OE3GBB
Hi, do others also have problems decoding FT8, or just you? Just a remark. 73' Gerhard OE3GBB Am 18.10.2019 23:14, schrieb G4GIR via Groups.Io:
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Yes, and this looks good.
Problem could be that the LNB drifts to fast for the locking to keep it within 1 Hz. For FT8 I expect you’ll need a very good and stable LNB.
Simon Brown, G4ELI https://www.sdr-radio.com
From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of G4GIR via Groups.Io
Sent: 18 October 2019 22:14 To: main@SDR-Radio.groups.io Subject: Re: [SDR-Radio] QO-100 and SDR Console FT8
Hi Simon
New territory for me, is this what you need?
73
Ian G4GIR |
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Hi Simon
New territory for me, is this what you need?
73
Ian G4GIR
From: Simon
Brown
Sent: Friday, October 18, 2019 9:22 PM
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] QO-100 and SDR Console
FT8 Ian,
Post a screenshot, let’s see what you’ve got.
Simon Brown, G4ELI https://www.sdr-radio.com
From:
main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of
G4GIR via Groups.Io
Hello Jim Thanks for the reply,
Yes the PC clock is kept synchronized using Meinberg. I have no problem decoding FT8 using WSJTX with any hardware rig i.e TS990, FT817 etc.
Yes I have a V3 RTL dongle which decodes FT8 ok on HF on another PC with WSJTX and SDR Console.
I just can’t decode any FT8 from QO-100 on a different PC using an earlier version RTL dongle.
Maybe it is the earlier version RTL Dongle causing a problem?
Can you decode FT8 from QO-100?
Thanks
Ian G4GIR
From: Jim Smith G0OFE Sent: Friday, October 18, 2019 7:27 PM To: main@SDR-Radio.groups.io Subject: Re: [SDR-Radio] QO-100 and SDR Console FT8
Ian, Sounds obvious, but do you have a means of keeping your clock accurate? I use Dimension 4. Do you have another SDR you can try and decode some FT8 on HF via Console? ================================ On 18/10/2019 17:35, G4GIR via Groups.Io wrote:
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Ian,
Post a screenshot, let’s see what you’ve got.
Simon Brown, G4ELI https://www.sdr-radio.com
From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of G4GIR via Groups.Io
Sent: 18 October 2019 20:52 To: main@SDR-Radio.groups.io Subject: Re: [SDR-Radio] QO-100 and SDR Console FT8
Hello Jim Thanks for the reply,
Yes the PC clock is kept synchronized using Meinberg. I have no problem decoding FT8 using WSJTX with any hardware rig i.e TS990, FT817 etc.
Yes I have a V3 RTL dongle which decodes FT8 ok on HF on another PC with WSJTX and SDR Console.
I just can’t decode any FT8 from QO-100 on a different PC using an earlier version RTL dongle.
Maybe it is the earlier version RTL Dongle causing a problem?
Can you decode FT8 from QO-100?
Thanks
Ian G4GIR
From: Jim Smith G0OFE Sent: Friday, October 18, 2019 7:27 PM Subject: Re: [SDR-Radio] QO-100 and SDR Console FT8
Ian, Sounds obvious, but do you have a means of keeping your clock accurate? I use Dimension 4. Do you have another SDR you can try and decode some FT8 on HF via Console? ================================ On 18/10/2019 17:35, G4GIR via Groups.Io wrote:
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Hello
Jim Thanks
for the reply, Yes
the PC clock is kept synchronized using Meinberg. I have no problem decoding FT8
using WSJTX with any hardware rig i.e TS990, FT817 etc. Yes
I have a V3 RTL dongle which decodes FT8 ok on HF on another PC with WSJTX
and SDR Console. I
just can’t decode any FT8 from QO-100 on a different PC using an earlier version
RTL dongle. Maybe
it is the earlier version RTL Dongle causing a problem? Can
you decode FT8 from QO-100? Thanks Ian
G4GIR From: Jim
Smith G0OFE
Sent: Friday, October 18, 2019 7:27 PM
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] QO-100 and SDR Console
FT8 Ian, Sounds obvious, but do you have a means of keeping your clock accurate? I use Dimension 4. Do you have another SDR you can try and decode
some FT8 on HF via Console? ================================
Jim, Bournemouth, Dorset. IO90BR. Elad FDM-S2, Airspy HF+, SDRPlay and Funcube Dongle SDR Recievers 8-element OP-DES for Band 2, 8-element LFA for 2m, 3-element LFA for 6m, 20m Windom for HF,. Wellbrook 1530 Loop for LF On 18/10/2019 17:35, G4GIR via Groups.Io
wrote:
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Jim Smith G0OFE
Ian,
Sounds obvious, but do you have a means of keeping your clock accurate? I use Dimension 4.
Do you have another SDR you can try and
decode some FT8 on HF via Console? ================================
Jim, Bournemouth, Dorset. IO90BR. Elad FDM-S2, Airspy HF+, SDRPlay and Funcube Dongle SDR Recievers 8-element OP-DES for Band 2, 8-element LFA for 2m, 3-element LFA for 6m, 20m Windom for HF,. Wellbrook 1530 Loop for LF On 18/10/2019 17:35, G4GIR via
Groups.Io wrote:
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Hello All
I have been trying to get SDR Console and WSJTX to decode FT8, from
QO-100 RX is RTL Dongle.
No luck whatsoever.
I have tried VAC and VB sortware which works ok when using Analogue Rigs on
HF .
I can see the FT8 signals from SDR Console in WSJTX, but nothing is being
decoded.
Does anyone have any advice please.
73
Ian G4GIR |
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