SAT Controller SDR Nano

  • For fast PTT detection the signal TX GND from ACC socket can be connected to CTS input of the USB/serial adapter (because via serial CAT command there will be some delay):



    If the SCU-17 sound card interface is used for CAT then there is a small modification of the CT-62 (RS232/CAT) cable required. For this cut the track on PCB between RTS and CTS pins and solder the emitter of a PNP transistor to the RTS pin and the collector to the CTS pin. Connect the base via a 4k7 resistor to TX GND signal of ACC socket:



    Remark: The original cable can not be used for this because there is no wire connected to TX GND. It has to be replaced.

  • Hi Frank,


    thank you for that lovely project :-)


    Could you please explain with a few words why you are using two RTL sticks and not just one?

    Is that neccessary for the beacon correction only?

    I am using almost a GPSDO stabilized LNB.


    When can we expect the image for the PI4 ?


    73, Mike

    DK1ML

  • Hello to all,


    Question: Does anybody has running the "Drift correction" properly?

    Today 2 pcs. of NooElec Nano 3 arrive and this was last idea i have what could be the problem. But no success.

    Again: I lock system to Master-beacon. Fine.

    Then i tune to CW-beacon in audio window to 1,5KHz.

    LNB LO corrects automatily according drift but the tuned signal of CW-beacon is not corrected.

    This means it drifts away from 1,5KHz in audio window.

    Who has any idea what the problem can be?


    73

    Volker, DH2VH

  • Due to the low feedback (probably many OMs do not use a Raspberry Pi), I only improved my own system and have not released any new image. Maybe sometime - if there is demand - I will prepare and publish an actual image. BTW: I love my little Raspberry station ;-)

  • Hi Frank,


    I think, that a used Windows Notebook for less than 100 EUR with the SDR-Console is more powerful and cheaper than a 50 EUR Raspberry Pi with touch display that alone will cost around 100 EUR.


    That is the reason for the lack of demand for your good software,


    73, Mike

  • Small hint: The default setting for the master frequency is now 10706 MHz (engineering beacon of Es'hail-2). Since this signal has the opposite polarization, it is not very strong. But it works well. The beacon is the left peak in the receiving spectrum (see screenshot below):


  • Just playing with the new version. Although equipped with an aluminum cooler/case, the pi4 gets very hot - the software is not to blame for this, from other experiments i knew it would get hot. I think a fan is mandatory.

    The performance is good , quick and the delay compared to the pi3b+ or even an analog rx is small. While i had some problems with crackling and interrupted audio on the p3b+ running the older version, this version for the pi4 runs smooth so far. Thumbs up!