Software DVB-S demodulator (Amsat-DL)

    • Offizieller Beitrag

    SWL - markro92 on the Amsat-DL forum has developed a software demodulator for use with SDRs. The thread is here: https://forum.amsat-dl.org/ind…ftware-dvb-s-demodulator/ I am not sure that the DVB-S1 is working too well in the current version (2.0.21).


    It appears to work with RTL sticks, Lime, Airspy, HackRF and AD Pluto SDRs and maybe others. I tried it with an AD Pluto on the radio stations on 16E. It's quite hard to get results but it can work down to very low symbol rates. It's not quite blind scan but you don't have to know all the parameters if you are prepared to play for a while. It should also work at high symbol rates using a Lime SDR or other high sample rate RX. It probably needs a fast PC as well.


    Plots are in this thread: RE: 16.0°E Eutelsat 16A

    1.2m Prodelin 3122 az-el with one of:
    S: Helical feed, 0.8dB NF LNA, X: 1.2dB NF LNA, conical feed,
    Ku 12-18GHz: corrugated conical feed, 1.5dB NF LNA, Ku (Standard): SMW Q-PLL type C, Prodelin feed. Ku (Extended): 11.3GHz LO SMW & Prodelin Feed Ka: Gilat ex-ODU PLLs Gilat feeds, Ka 18-26.5GHz: Patriot feed, home made 4dB NF LNA, Ka DSN: Corrugated conical feed, home made 3dB NF Down-Converter

    1.5m IRTE, Polar mount with Octagon OSLO mod. C120, IRTE feed
    40km East of London, UK

  • apparently made by "SWL - markro92" the current version (2.0.21). is here ::73:

    https://forum.amsat-dl.org/ind…-s-demodulator/&pageNo=37

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


    as you said before : work with RTL sticks, Lime, Airspy, HackRF and AD Pluto SDRs and maybe others...:73:

    Main features will be:

    - Receiving multiple transponders at once

    - Scanning a frequency range for transponders and detecting settings automatically

    - Saving common transponder locations and grouping them

    - 16APSK and 32APSK support

    - Displaying the Signal to Noise Ratio

    - Increasing performance by supporting AVX for some of the worker threads.

    - Linux Release (probably Debian or ArchLinux)

    Optional Features:

    - OpenCL support, mainly for offloading LDPC decoding to the GPU.

    - Port to Raspberry PI 4

    minimum requirements..: have to use Windows 64 bits !!!:77:

    https://forum.amsat-dl.org/ind…b-s-demodulator/&pageNo=2

    - CPU should support SSE4.2

    - 64 bit CPU

    - Multiple cores are a good idea (minimum quadcore), otherwise it will only work with very low sample- and symbolrates.

    • Offizieller Beitrag

    Hi flie It is a little confusing. I think the improvements mentioned refer to version 2.1 which was to be released mid-December. v2.0.21 is the one I was using and it does not have the extra features it also has a problem with DVB-S1 that I found. It doesn't look like the author has been back to the Amsat-DL forum since the end of November.

    1.2m Prodelin 3122 az-el with one of:
    S: Helical feed, 0.8dB NF LNA, X: 1.2dB NF LNA, conical feed,
    Ku 12-18GHz: corrugated conical feed, 1.5dB NF LNA, Ku (Standard): SMW Q-PLL type C, Prodelin feed. Ku (Extended): 11.3GHz LO SMW & Prodelin Feed Ka: Gilat ex-ODU PLLs Gilat feeds, Ka 18-26.5GHz: Patriot feed, home made 4dB NF LNA, Ka DSN: Corrugated conical feed, home made 3dB NF Down-Converter

    1.5m IRTE, Polar mount with Octagon OSLO mod. C120, IRTE feed
    40km East of London, UK

  • yes you are right ...these Main features like 16APSK and 32APSK support ....etc .. will be for v2.0.21


    just one question ; can this work with it ?

    they said here : it is Realtek RTL2832P USB interface ?!


    https://medium.com/@iMash/how-…ndows-with-a-9cd91732e376

    Bilder

    • Offizieller Beitrag

    flie I have not seen that one before but it includes a DVB-T demodulator so may not be able to output the IQ stream needed. The best RTL sticks are the RTL2832 with R820 or R860 front end chip. THere's a list here which includes other variants: https://osmocom.org/projects/rtl-sdr/wiki/Rtl-sdr

    Try here https://www.ebay.co.uk/sch/i.html?&_nkw=rtl+sdr

    There were problems with some R820 chips which had a restricted upper frequency range. Take a look here for more info and background https://www.rtl-sdr.com/


    I think that the best value SDR is the ADALM-Pluto but the price has increased a lot since it's launch.

    1.2m Prodelin 3122 az-el with one of:
    S: Helical feed, 0.8dB NF LNA, X: 1.2dB NF LNA, conical feed,
    Ku 12-18GHz: corrugated conical feed, 1.5dB NF LNA, Ku (Standard): SMW Q-PLL type C, Prodelin feed. Ku (Extended): 11.3GHz LO SMW & Prodelin Feed Ka: Gilat ex-ODU PLLs Gilat feeds, Ka 18-26.5GHz: Patriot feed, home made 4dB NF LNA, Ka DSN: Corrugated conical feed, home made 3dB NF Down-Converter

    1.5m IRTE, Polar mount with Octagon OSLO mod. C120, IRTE feed
    40km East of London, UK

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