Software DVB-S demodulator

    Quote from IK3XKQ

    Sì, qualche giorno fa manualmente ho cambiato la posizione dell'lnb installato sulla parabola satellitare. Oggi ho cambiato la polarizzazione per mezzo della tensione di alimentazione: banda stretta a 12 volt, banda larga a 15 volt. Grazie

    il tuo LNB in posizione verticale con 18 volt con poco di inclinazione verso orizzontale ma poco un 1cm dal verticale

    Quote from EA2ARU

    Dear om:

    I am working (and playing) with the last version. with Adalm-Pluto. But I have one qestion: not is possible set Modmode fixe to QPSK 4/5 to see only the QO-100 DATV?

    73,s de Jabi, ea2aru.

    Hi Jabi, your question is confusing, I don't understand to set Modmode fixe to QPSK 4/5, the question about Adalm-Pluto is all automatic, if you are using Minitiune V2 there is no parameter to set, I think your question is that you are not receiving QO100.

    73 Tony ik1hgi

    Hey Guys,


    Have anybody the same problem that when tcp-stream is using the VLC-Player frozes after 2 sec picture showing. Audio works all the time. Its not a permanent problem (some signals works correctly, beacon) but some signals frozes everytime when I want to decode. Test it out with some versions of DVBS-GUI and VLC-Player.


    Its curios because i think it have not be to make a change between beacon and other signal. Beacon is working correctly...


    73 de DL1DJH

    Hi Dominik,

    I am new to the this forum so have my excuses for silly question.

    I am a user of QO100 satellite using an home made sdr transceiver running on Linux in the narrow band.

    I am know trying to make a receiver working in the wide band place detecting the TV channel but ... my big problem is that that producing the demodulator is out of my capabilities , i tried to use the leandvb but it showed lot of problems trying to integrate the code in my application. When i saw your thread i tried to use the given address to download your version it did not work.

    Is it possible to have your code?

    Thanks in advance for your attention.

    73,nando

    Hi George,

    Thanks for answering, i am not afraid of writing C++ statements but unfortunately my knowledge of digital TV encoding is almost inexistent, actually i have been searching on web what you meant with MER. I did not consider the TCP option because my goal is to produce a stand alone receiver connected to the antenna. Also the MER suggested by you for what i understood is a tool just for checking the quality of the received signal. I saw the offer made by Dominik and concerning an already written and checked decoder which was promising.

    Do you have an idea if still available and eventually how?

    Nando

    George , Yes i believe i got what is a mer (modulation error ratio) via a constellation graph but is not what i am looking for which is, possibly, a DVB_s2 decoder to integrate with my software then may be also a mer could participate.

    73,nando

    Quote from St2nh

    Hi all and seasons greeting . I'm looking for the last version link for DVB-S demodulator   . Thanks & 73

    Hi St2nh Nader. The link is (page 40 this thread):

    73 !


    Version 2.1.0


    Download: http://v.1337team.tk/dvb-s_gui_amsat.zip




    Changelog:


    • Added support for 16APSK and 32APSK modcodes
    • Fixed demodulator using wrong modcodes in ACM/VCM mode
    • Fixed a crash occuring while cleaning up buffers on program exit
    • Fixed wrong scaling of TCP input samples using the F32 format
    • Fixed IQPlot imaginary axis being flipped
    • Removed QCustomPlot dependency

    Hi all. The software is working quite well with a NOOELEC sdr stick and a 80cm dish. Signals must be nearly as strong as the beacon to decode. So far I am able to decode 1500ks to 250ks in QPSK. This software is great for getting started in DATV on QO-100. :thumbup::)

    Hi!


    I'm having issues receiving DATV signals from WB transponder.

    My current set-up is:

    85cm dish

    Opticum LSP-02G LNB (-> supply voltage is 18.5V)
    Adalm Pluto and/or RTL SDR USB Stick


    I tired with SDR Angel and with this software. But the video and audio is mostly not stable...



    I played with the BB gain setting and the current setting gives me the best result.

    Is there anything else I could optimize in the settings to get a better signal?



    On NB transponder my SNR is 31 dB (CW beacon) - is that enough for receiving DATV signals via WB?


    Thanks + 73

    Mic

    i have the same problem with picture freeze after a second but audio still works

    any hints what it may be?

    beaon decode works fine but i see that on several ham signals its difficult to find a lock

    and even if locked not always a picture is shown