Transmit digital television signals over Qatar Oscar 100 satellite

Le logiciel de diffusion vidéo OBS Studio

The Windows drivers

It will soon be time to connect the Adalm Pluto to the PC.

        1. Download and install the driver for Windows ( or the file v0.7 file directly from this site).
        2. Now it’s time to connect the Adalm Pluto for the first time via its central USB socket directly to the computer. A disc drive will appear in your file explorer. It will be named PlutoSDR. LED1 is flashing slowly.
        3. Double-click on the info.html file. At the bottom of the page, you will find the IP address of your PlutoSDR connected to your USB port. The info.html page is also accessible through the IP address in your browser from the PC on which your Adalm Pluto is connected. Type in the URL of your browser, or click :

Firmware update

We will now implement the official Analog firmware Device™ v0.31. This operation is necessary to then apply the firmware developed by Evariste F5OEO. Check the version in place is not already the last one on the Adalm Pluto information page, Build line. If this is the case, go to the next paragraph.

  1. Download the file on or directly on this website : plutosdr-fw-v0.31
  2. Extract the contents of the zip file.

  3. Your Adalm Pluto is plugged in. Copy the file pluto.frm to the root of the PlutoSDR drive
  4. To start programming the firmware, right-click on the PlutoSDR drive, and click Eject.
  5. LED1 starts flashing quickly. This will take three to four minutes. Do not interrupt the process as this may damage your equipment.
  6. After updating, the PlutoSDR drive reappears in your browser. You can launch your web browser and access the main page of the Adalm Pluto by

Extending the capabilities of Adalm Pluto

Increasing the frequency range

The current version of Pluto uses the AD9363 chip which is “limited” to a frequency range of 325 to 3800 MHz and a bandwidth of 20 MHz. However, the AD9364 chip, which can support a frequency range of 70 MHz to 6000 MHz and a bandwidth of 56 MHz, is claimed to be almost identical to the AD9363 chip. The Adalm Pluto can be tricked into seeing an AD9364 chip simply by changing a parameter variable, but there is no guarantee that the full range of frequencies and bandwidth will be given for all devices. It is possible that the AD9363 chips are actually AD9364 chips that have failed performance quality checks and have just been renamed to a low-end model, or that a cheaper semiconductor process is being used with the low-end chip.

Connection to Pluto SDR by terminal

On the computer on which your Adalm Pluto is connected, we will install terminal emulation software. I use and recommend Putty.

Connect with terminal software, indicating the IP address of the PlutoSDR, SSH protocol (port 22).

Enter the default login and password.

login : root
password : analog
Warning: Permanently added '' (ECDSA) to the list of known hosts.
root@'s password: analog
Welcome to:
______ _       _        _________________
| ___ \ |     | |      /  ___|  _  \ ___ \
| |_/ / |_   _| |_ ___ \ `--.| | | | |_/ /
|  __/| | | | | __/ _ \ `--. \ | | |    /
| |   | | |_| | || (_) /\__/ / |/ /| |\ \
\_|   |_|\__,_|\__\___/\____/|___/ \_| \_|


By default, the following two commands should return errors:

# fw_printenv attr_name
## Error: "attr_name" not defined
# fw_printenv attr_val
## Error: "attr_val" not defined

Pass the two commands and restart the pluto with the third line.

# fw_setenv attr_name compatible
# fw_setenv attr_val ad9364
# reboot

After rebooting and reconnecting to your PlutoSDR, both commands return the saved settings.

# fw_printenv attr_name
# fw_printenv attr_val

Enabling the second processor core of the PlutoSDR

It’s not sure if it’s really useful, but maybe for the very large signals of a few mega-symbols ?

The following command returns the characteristics of the processor.

cat /proc/cpuinfo

Still connected with your terminal to the Adalm Pluto, run the command.

fw_setenv maxcpus

You can run the following command again, the result now shows both CPU cores.

# cat /proc/cpuinfo
processor       : 0
model name      : ARMv7 Processor rev 0 (v7l)
BogoMIPS        : 666.66
Features        : half thumb fastmult vfp edsp neon vfpv3 tls vfpd32
CPU implementer : 0x41
CPU architecture: 7
CPU variant     : 0x3
CPU part        : 0xc09
CPU revision    : 0

processor       : 1
model name      : ARMv7 Processor rev 0 (v7l)
BogoMIPS        : 666.66
Features        : half thumb fastmult vfp edsp neon vfpv3 tls vfpd32
CPU implementer : 0x41
CPU architecture: 7
CPU variant     : 0x3
CPU part        : 0xc09
CPU revision    : 0

Hardware        : Xilinx Zynq Platform
Revision        : 0003
Serial          : 0000000000000000

14 thoughts on “Transmit digital television signals over Qatar Oscar 100 satellite

  1. Christian,

    Congratulations, this is one of the Blog articles I’ve read about how to setup a DATV station for QO-100.

    Thanks for sharing with the community.

    Alex EA4BFK


    Félicitations, c’est l’un des articles de blog que j’ai lu sur la façon d’installer une station DATV pour le QO-100.
    Merci pour avoir partagé avec la communauté.

    Alex EA4BFK

    1. Merci Christian Superbe tuto !! A bientôt sur QO-100
      73 de ON1RC

      Thank you Christian Superb tuto ! See you soon on QO-100
      73 from ON1RC

      1. Bonjour Christian
        Mais quel superbe outil de travail, moi qui suis totalement néophyte dans le mode DATVet dans l’utilisation du logiciel OBS.
        Me voici équipé pour comprendre le fonctionnement et pouvoir parfaire mon installation.
        Félicitations pour la qualité de tes tutos qui sans nul doute vont être un fabuleux tremplin à beaucoup pour créer sa station.

        73 cordialement salutations et au plaisir de te retrouver sur le satellite Q0-100. F3CJ

        Hello Christian
        But what a great tool, I’m a total neophyte in the DATVet mode in the use of OBS software.
        Here I am equipped to understand how it works and to be able to perfect my installation.
        Congratulations for the quality of your tutorials which will undoubtedly be a fabulous springboard for many to create their station.

        73 cordially greetings and I look forward to seeing you on the Q0-100 satellite. F3CJ

  2. Merci beaucoup Christian.
    Des informations très précises et détaillées.
    73 de Aitor F4VTB EB2AT

    Thank you very much, Christian.
    Very precise and detailed information.
    73 of Aitor F4VTB EB2AT

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  4. Thanks for the wonderful guide. Very comprehensive. Thanks again for sharing your experiences. With gratitude 73 de Ros i4wrm

    Merci pour le merveilleux guide. Très complet. Merci encore de partager vos expériences. Avec reconnaissance 73 de Ros i4wrm

  5. Bonsoir Christian F5UII,

    Merci pour votre tuto, très instructif. J’ai échangé avec Pascal F4BRF et Nicolas FR4LI au sujet de la modification à base de 2 x 4N35 (montage vu sur le net pour l’ADALM PLUTO).L’idée, une commutation TX/RX pour la partie amplificateur SG-LAB depuis le PLUTO.
    J’aimerai avoir votre avis avisé sur le sujet svp. En vous remerciant par avance.
    Au plaisir de vous lire Christian F5UII.
    73 de Axel FR5GS

    Good evening Christian F5UII,

    Thank you for your tutorial, very informative. I discussed with Pascal F4BRF and Nicolas FR4LI about the modification based on 2 x 4N35 (assembly seen on the net for the ADALM PLUTO) The idea, a TX/RX switching for the SG-LAB amplifier part from the PLUTO.
    I would like to have your opinion on the subject please. Thank you in advance.
    Looking forward to reading you Christian F5UII.
    73 from Axel FR5GS

    1. Oui, le logiciel SDR Console et également le firmware PlutoDVB d’Evariste F5OEO pilotent les sorties GPO0 et GPO1 lorsque l’on passe en émission. On utilise les 2 sorties car toutes les deux passent en émission à la mise sous tension du Pluto pendant environ 5 secondes.
      Commutation émission PTT sur Adalm Pluto SDR
      On trouve deux schémas permettant la commutation PTT, l’un à base d’optocoupleurs, l’autre à base de transistor et relais reed. J’ai choisi de mettre en œuvre la seconde technique, avec double circuit de commutation, permettant d’alimenter distinctement 2 sorties indépendantes. Une commande groupée sera certainement prochainement proposée. Tous les détails sur cette page.
      Il existe une autre solution, mais que je ne conseille pas au vu du risque engagé sur le Pluto. Il s’agit de celle qui consiste à détecter l’activité du bit0 du bus 12 bits du convertisseur numérique /analogique. Pour la curiosité, je vous laisse découvrir cette mise en œuvre de DH1NFJ sur ce site internet (langue allemande).

      Yes, the SDR Console software and also the PlutoDVB firmware of Evariste F5OEO drive the GPO0 and GPO1 outputs when you switch to transmission. Both outputs are used because they both switch to transmission when the Pluto is switched on for about 5 seconds.
      Amplifier PTT control - Adalm pluto SDR
      We find two schematics for PTT switching, one based on optocouplers, the other based on transistor and reed relay. I chose to implement the second technique, with a double switching circuit, allowing to supply separately independent 2 outputs. A grouped order will certainly be proposed soon. All details on this page.
      There is another solution, but which I do not advise in view of the risk involved on the Pluto. It is the one which consists in detecting the activity of bit0 of the 12 bits bus of the digital/analog converter. For curiosity, I let you discover this implementation of DH1NFJ on this website (German language).

      1. Bonsoir Christian,
        Merci pour toutes ces informations. Inscription faite de mon côté pour la prochaine commande groupée (PTT Pluto). 73 de Axel FR5GS

        Good evening, Christian,
        Thank you for all this information. Registration made on my side for the next group order (PTT Pluto). 73 from Axel FR5GS

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  7. Christian,

    Congratulations, for great work.

    Thanks for sharing with the community.

    Jose EA3HMJ


    Félicitations, pour votre excellent travail.
    Merci d’avoir partagé avec la communauté.

    Jose EA3HMJ

  8. Bonjour Christian,
    Merci pour vos articles qui nous permettre d’avancer sur la construction de notre deuxième station DATV à l’Ile de la Réunion. Nous sommes actuellement actif sur QO100 en bande étroite.
    La station DATV est en cours de construction en suivant à la lettre votre tuto.

    Nous recherchons un système à base d’Arduino capable de mettre off le PA du SG Lab lors d’un SWR élevé et qui serait capable de faire les mesures de puissance OUT/IN. Ceci en utilisant les points de mesures en tension prévu à cet effet. Avez vous une idée si un Om c’est déjà penché sur la question.
    Par avance merci,
    Nicolas Dhiver

    Hello, Christian,
    Thank you for your articles which will allow us to progress on the construction of our second DATV station in Reunion Island. We are currently active on QO100 in narrowband.
    The DATV station is under construction following your tuto to the letter.

    We are looking for an Arduino based system able to turn off the SG Lab PA at high SWR and which would be able to make OUT/IN power measurements. This by using the voltage measurement points provided for this purpose. Do you have an idea if an Om has already looked into the matter.
    Thank you in advance,
    Nicolas Dhiver

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  10. This is a great guide, helped me a lot. Merci!
    Ed PY2RN

    C’est un excellent guide, qui m’a beaucoup aidé. Merci !
    Ed PY2RN

    1. Bonjour Rudy,
      La carte exploite le changement d’état de la voie GP0, et GP1 qui, lui, bloque le passage à l’émission lorsque le Pluto démarre (GP1 actif en même temps que GP0 au démarrage). Elle est compatible avec les logiciels qui font commande le GP0 au passage en émission du pluto. C’est le cas en effet PlutoDVB d’Evarise F5OEO et SDRConsole de Simon G4ELI. Peut être d’autres le propose… ou le proposeront.
      D’après ce qui est indiqué sur le wiki de l’Analog Device, on doit pouvoir ajouter cette instruction (entre autres lignes) pour ajouter la commande automatique de la voie GP0.
      iio_attr -a -D ad9361-phy adi,gpo0-slave-tx-enable 1

      Bons essais. N’hésitez pas à partager vos conclusions ici.
      73 Christian

      Hello, Rudy,
      The board exploits the state change of channel GP0, and GP1 which locks the switch to transmit when the Pluto starts (GP1 active at the same time as GP0 at start up). It is compatible with the software that controls GP0 when the Pluto is transmitting. This is indeed the case of PlutoDVB from Evarise F5OEO and SDRConsole from Simon G4ELI. Maybe others propose it… or will propose it.
      According to the wiki of the Analog Device, it should be possible to add this instruction (among other lines) to add automatic GP0 channel control.
      iio_attr -a -D ad9361-phy adi,gpo0-slave-tx-enable 1

      Good try. Feel free to share your findings here.
      73 Christian

  11. Wonderfull site and good OM thanks for all your time

    GRTZ the Alain ON7ATV

    Site merveilleux et bon OM merci pour tout le temps passé

    GRTZ le Alain ON7ATV

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