The transmission over Qatar Oscar 100 satellite with SDR Console

Avant d'émettre, un peu de confort avec SDR Console

A voice keyer with SDR Console

The Transmit panel of SDR Console offers 3 buttons that allow you to switch different audio sources and their settings. The buttons are labeled Normal, DX and Other.

For each button, you can define independent settings, including specific sound cards. I propose to you step by step the implementation of a voice keyer.

  1. Install recording software such as Audacity. This software is free and has many audio signal processing functions (filter, editing, noise reduction…). You can also simply use the Windows standard recorder.
  2. Record your CQ call with your most beautiful voice. Save the project.
  3. To be able to properly “inject” your recording to SDR Console, we will install two virtual audio channels. Download and install VB-CABLE Virtual Audio Device.
  4. On Windows, two new audio channels are now available: a Cable Input channel and a Cable Output channel. The two channels are connected together. As soon as a sound is sent on Cable Input, it is available on Cable Output. To be able to use the new audio channels, restart SDR Console and Audacity.
  5. On the Transmit panel, we will consider that with the Normal button, you will configure your microphone with which you usually work.

    Voie Normal pour le microphone habituel

  6. Now, let’s configure the DX button, which will have to be switched to activate it for your caller. Choose CABLE Output, and switch on the VOX.

    Voie pour la source externe

  7. Now, on your audio player, switch the audio output to CABLE Input.

    Start playback of your recording in your audio player. This is sent via the Cable Input/Cable Output channel to SDR Console, which immediately switches to transmission using the VOX function. On Audacity, to start playing your recording in a loop, hold down the Shift key on the keyboard before clicking on Play (or directly at the keyboard shortcut: Shift + space bar). If you have an answer to your call via satellite, you will click on the Normal button on the Transmit panel of SDR Console, so that your usual microphone is operational again.

The band limits

Since version 3.0.11 of SDR Console, it is possible to integrate markers on the spectrum. On my configuration, I added the band plan limits for traffic on the QO100 satellite.

I invite you to do the same, by downloading my already configured file.

  • Download my file SDRConsole BandMap QO100 F5UII.CSV
  • On the View tab (menu), click on Markers.
  • On the Spectrum Makers window, click on the”…” button and choose CSV Import. Point on the downloaded file.
  • Select all lines and then OK. Close the “Spectrum Makers” window

One thought on “The transmission over Qatar Oscar 100 satellite with SDR Console

  1. Bonjour Christian,
    Superbe travail…Bravo et merci de faire partager.
    Je voudrais démarrer sur QO-100 sans aucune expérience satellite (OM).
    J’ai compris que dans votre description de la partie réception, vous utilisiez un dongle RTL mais qu’ensuite lorsque vous décrivez la partie émission, vous utilisez un transceiver Lime SDR pour l’émission et la réception.
    – Je ne comprends pas bien quels sont les éléments de la photo ci-dessus..?
    – a priori le mode de fonctionnement est le full-duplex mais je ne vois pas comment il est possible de connecter simultanément la sortie de la tête 10GHz et l’antenne hélice d’émission via les différents preamplis et amplis mentionnées.
    Merci pour votre aide.

    Hello Christian,
    Great work…Well done and thank you for sharing.
    I would like to start on QO-100 without any satellite experience (OM).
    I understand that in your description of the reception part, you use an RTL dongle but then when you describe the transmission part, you use a Lime SDR transceiver for transmission and reception.
    – I don’t quite understand what the elements of the picture above are…?
    – a priori the operating mode is full-duplex but I don’t see how it is possible to connect simultaneously the output of the 10GHz head and the transmission propeller antenna via the different preamps and amplifiers mentioned.
    Thank you for your help.

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