start guide dvbs-2 demod in forum avaible page 13 for all datv - qo-100 with simple rtlsdr usb device
Hi Jean-Louis. There is info on the amplifier in the forum. You need about 170mW input for 3.5W out
Hi My name is Jean-Louis, ZS6AAG i am experimenting with uplink to the satellite with antenna logarithnic 12db, one hackrf and one ampli 2.4ghz 8 watts from china, can i attack directly the wifi amplifier or i need something between the hackrf and the wifi amplifier, many thanks for your answer
Thank you, I have changed the settings as you indicated but still no luck, I believe the signals on the WB transponder are too weak for this part of the world, DATV will be very difficult to rx/tx from here, although the signals on the NB are very strong.
73
Ed PY2RN - ..-
This is very strange. Have you tryed to experiment the change of polarization ? Are you sure about the power supply to yours LNB at 18 V to reach the horizontal polarization ?
73
Okay, with the suggestion of JP I have been modified the LO ref. The procedure that I have been used is to, increase and decrease, by some try, the main frequency. I found good rx at 333 K/s decreasing 40 KHz. This difference is now applied to the LO, in main screen. Inserting now the real frequency (From BATC Spectrum WB) the Minitioune locks the signal. Now I will need to try with more lower rates.
More test will be done. Stay tuned.
73
I belive to have the same issue.
Looking forward for a manual
73 Thanks
Regards
Form Amsat UK :
"At the RSGB AGM in Birmingham on Saturday, April 27, 2019 two awards were made in recognition of work related to the amateur radio transponders on the geostationary satellite Es’hail-2 / QO-100.
The prestigious Louis Varney Cup for Advances in Space Communication was awarded to Peter Gülzow DB2OS for his leadership of the team responsible for the Qatar-OSCAR-100 mission which is now in service."
Congratulations to Peter for this Prize and thanks to all Amsat-DL team for all the effort.
My solution to this issue is to insert a Russian transverter (cheap but stable), between the LNB at 432 and my ts 2000 at 28 MHz. I assure the success of this solution, the only issue to cure is the gain reducing with the the transceiver or adding ad attenuator on the lnb line id the noise is too hign.
73.
Alessio, rev B does not require HW modifications.
Page 29 manual.
Visto, stasera provo. Grazie.
Hi Lucio,
I'm using the same version (B iI suppose but where is the evidence ?), still having issues with Mititioune express HW. I'm fighting a lot to have a best results, I can decode only down to 1 M/s, below it's impossibile. I downloaded the version :
MinitiouneV09beta8_9 package.zip
73 vy best
I suggest to put the new version in a different folder from the previous versions and to use only the minitiouneConfig.ini file of the latest version.
The Sw is in two separate folder, in my case, but in my opinion this not represent the focus.
First of all I've some doubt on the correct pointing of my dish. but comparing signal form batc Wb spectrum and my SDR, i found the same signals. Yes Express is a hardware very different from other models of Minitiotune, the critical point may be the temperature. It's my aim to modify the Express for the 5 V supply. This mods is described clearly on the manual provided. It's quite complex to do due SMD, but not a mission impossible. If this way fail I'm ready to buy another and I hope more efficient hardware.
Alessio, no problem here with MiniTiouner Express HW.
ciao
Thank you Lucio, this means that my hardware has issues.
May be due the high temperature, The LNB is powered thru hardware (+18V). It's my intention to reduce voltage to 5 v (with mods) and power the LNB via Bias-tee.
I hope this solve.
73.
Display MoreHello,
If you already have a MiniTiounerPro or MiniTiounerV2:
You can download the beta version 0.9 of Minitioune.
It is optimized for working with QO-100 . Many buttons and more features .
link for explanation: http://www.vivadatv.org/viewtopic.php?f=80&t=600
link for download : http://www.vivadatv.org/viewtopic.php?f=60&t=601
73
Jean-Pierre F6DZP
Hi JP,
in these days I tested new version in my Minitioune Express HW.
Unfortunately V 0.9 Version cannot decode at 125 K/s, 333 K/s. The old version decode these speed toghether without problems. May be something wrong in the new sw or may be my hardware has some issues ?
73 de Alessio
Display MoreThe receiving part of QO-100 was ready when the satellite was still on the ground. I planned two different setups. The first for the fixed station and a second one for the operations in /portable.
In the fixed QTH I mounted two antennas; 1 meter dish for the RX (Octagon TWIN LNB) and a second 85 cm dish for the TX, 4 turns Helix antenna.
All the equipment is mounted in the house and the antennas are 22 meters away. This is a choice made later, after checking the satellite in orbit. Everything is naturally ready to go directly under the antennas but at the moment it is not needed.
Some photos that give the idea. In the future I'll put the photos of the second setup not ready yet.
P.S.
All the holes in the case, the mechanical works, were made by my friend Pino, IK0SMG.
Nice object. Congratulations for the project, and for Pino.
Regards.
Hi all,
yesterday I observed that many station doesn't respect the WB, Bandplan. There was stations transmitting at 500 K/s in the 333 K/s reserved frequency. Someone transmit at 1 M/s, in the 333 K/s - 125 K/s portion. Someone transmit not perfectly centered in the 125 K/s. This behavior damage all. Please pay attention to the rule, I strongly suggest to use the BATC, monitor, very useful to monitor your emission.
Moreover due to the high traffic, in my opinion it is time to revise the bandplan, and reduce the 2 M/s, Beacon, to 1 M/s.
Do you agree with me ?
73 de IK4IDY
Always useful Heiner ! TU.
I confirm. On Minitioune Express with Minitioune V0.9 all is ok, tested yesterday. I will do further test on low speed rate.
Thank you so much for you effort JP.
Hello to the amsat F6DZP group there is a system to use MiniTiouner with the program, to use the Sdr-sharp key the only program!!!
73 ik1hgi Tony
Minitioune software is designed now only for NIM SERIT Hardware, or similar tuners, not for DVB-T keys. If you are interested about SW running on DVB-t keys, search for dvbs-gui. May be this solution is suitable for you, but Minitioune has a step ahead. I strongly suggest you to evaluate the construction of the hardware, or to buy Minitioune.
Regards.
73 A.
A few days ago i had a successful QSO with an austrian OM.
The DV signal is much smaller (1,2kHz) than the allowed 2,7kHz, so no problem on NBTP.
If you want to do a test then install the SW and let me know.
vy73 DB8TF
Software installed, I will try setup of the audio, trying a combination with sdr console and radio...tu FOR INFO'S.
73 Alex
Easypal? > https://www.sigidwiki.com/wiki/WinDRM (3 stronger peaks left IN the digital signal visible!) https://www.sigidwiki.com/images/f/f3/Digital_sstvimg.jpg
FreeDV? > https://www.sigidwiki.com/wiki/FreeDV_COHPSK (2 peaks in the middle of the digital Signal visible)
Both modes are used from time to time on QO100 NBTP
Are Tests in Free Dv possible ? Are there any restrictions to use this mode ?
Thanks.
free DV explains the "WB" signal exceed limit of KG-STV band.
Now all is explained !
A.
Yes KG-STV Application for Windows, usually at 10489.625 +/-.
I confirm. But last week hearded similar signal with more BW, unable to decode.
Regards
Very sad this is a bad news. But, are we sure about the source ? May be a unvoluntary noise generated by a defective transmitter in Doha or in the group of the Eshail customers ? Now someone on the chat talks about anti-radars from the Syrian zone...
