SAT Controller SDR Nano

  • Full image


    Update SatControl

    cd ~/SatControl

    rm *




    Update GQRX settings

    cd ~/.config/gqrx

    rm *




    In next versions there will be an update function:

  • hallo

    das gqrx findet lime mini und ubernimt die einstelungen aber i sat control can man nicht einstelen direkten senden auf an 2.4 ghz kans du das implementiren das wehre schoen .

    gruss vojko

    de S52E

  • Hi,

    may i point you to , a software to make the raspberry transmit. I tried it and was surprised.

    The transmitted signal level is high enough on SW, 144 , 432 or 1296 Mhz to drive a booster and then be fed into an upconverter.

    The test-program there provides various modes, It transmits prefabricated pictures or speech from files. I tried SSTV, FREE-DV and SSB.

    The received picture was very good, so was the decoded audio in Free-DV. Also the transmitted .wav-file for SSB was of good quality.

    Setup: Raspberry Pi3 > 70cm Transverter , LZ5HP Upconverter. The level was too low to drive the LZ5HP mdirectly, so i used the 70cm Transverter's 1mW input to provide enough level on 70cm to drive the LZ5HP.

    Unfortunately , there is no way (yet) to transmit audio from a microfone.

    Maybe DL3DCW wants to enhance his satcontrol-Software ? Who needs a pluto when you have a raspberry...

    73, Martin

  • I recorded my own file and transmitted it. The result was such that the audio speed was drastically reduced and there was a broad noise on it. I don't know how to find out the correct properties of the audio file. But then there is a forum for rpitx.

    It is a matter of time until i or someone else finds the solution. BTW: The transmitted file is sampleaudio.wav . First, there is a carrier for a few seconds, then sampleaudio.wav is transmitted.

  • Is it possible to start GQRX automatically without any user intention if there is no keyboard, mouse, touchscreen or touchpad?

    Just like the Elecraft PX3 spectrum display.

    There are two tasks to manage, at first GQRX has to be started by shell and afterwards the start button/function must be activated.

    Any ideas how to do this will be highly appreciated :-)

    73, Mike

  • Hi, there are no parameters possible via command line. You can start GQRX via script, but you can't hand over any commands to GQRX.

    If your intention is to have a easy-to-access satellite downlink, you might want to check out DJ0ABR's websdr. It provides a browser accessible gui.

  • Hi all,

    just to give Frank, DL3DCW some feedback on his work.


    I was totally new to the Raspberry Pi. I ordered a Pi3+B and I was not over stressed with the headless installation of the Pi in my local network.

    As well I had no big problems installing the SATCONTROL image provided by the SATCONTROL side.

    For unzipping Franks image I used the Raspberry Pi Imager.

    With this tool you are able to pick, unziped and copy the file to the SD card by just using one tool. This will than do all the jobs for you.

    The SAT RECEIVER program in combination with the SAT CONTROLLER program was a bit challenging to use.

    The needed positive feedback, if the SAT CONTROLLER is working or not is a bit tricky in the beginning. I still get nor fcorrection of the tool showing on the display. But it seems to work.

    I still do not found my own procedure to get the beacon correction working straight away every time I start the program new.

    I needed some more feedback. That for I used the NB WebSDR to compare frequencies.

    The planned usage for my setup is to have a low power consuming tool for field operation to setup the RX of the dish to its maximum.

    As well to monitor the band while using an analogue field setup.



    Resued 10“ laptop screen with external controller board

    Reused Logitech BT keyboard 7“ (ipad mini)

    Reused BT mouse

    Power supply: 12V for screen and DC/DC dwn convtr 12 - 5V for the Pi3

    Headphones with the Pi3 (is a bit weak)

    So let us hear what your experiences are with Franks program and how you are able use it.

    Especially your feedback on your usage of the beacon correction tool is of interest.

    so, 73 from JO50PX de DM5TU - sTef

    72 de sTef

    … -.-

    DM5TU / VY1QRP - DL-QRP-AG *GM* - GQRP #8769 - CalQRP #034 - NAP #1607

  • Hi Stefan,

    thanks for response. Some things should be noted before operation:

    1. Lock to master signal

    First, the system must be set to a reference signal (menu item "Lock" ). This is used to calculate the actual LO frequency and as master signal for the software drift correction. Default setting is the engineering beacon of Es'hail-2 (menu item "Master"). With the preset RF frequency you have to adjust the peak in the audio spectrum to 1.5 kHz.

    This process must be repeated occasionally if the LO frequency has drifted too far away. If you have problems, you should experiment with the parameters and possibly restart the program (unfortunately this function is not perfect at the moment).

    2. Adjust beacon frequency

    Fast fine adjustment is possible with a beacon signal in NB passband (button "Adjust"). Default setting is the middle beacon of QO-100 transponder (menu item "Beacon"). With the preset RF frequency you have to adjust the center of the signal in the audio spectrum to 1.5 kHz.

    This procedure should be performed before each operation (after a short warm-up phase). Because the SDR software sometimes shows errors of some 100Hz. This often happens when you restart GQRX, change frequency ranges or if you tune via the big frequency indication digits. For tuning it will be better to use the mouse wheel and/or place mouse pointer to desired frequency in the waterfall. The fine adjustment should be checked regularly. In the future hopefully this step can be omitted.

    At which step do you have problems?

    Frank, DL3DCW