Posts by DB2OS

    Hallo Peter


    I want receive with my radio, not via SatNOGS. Otherwise I could also receive via WebSDR. But that's not my thing.

    Thomas,


    you misunderstood me.. I tried to help you and give you a hint how to use MMSTV with your recorded Wave-file !!!


    The SatNOGS is my own station and not a WebSDR. I wanted to decode the recorded file of my own station, nothing more, nothing less.. just read the instructions in my original post and you will see how you can play a recorded file within MMSTV..


    73 Peter

    Hello,



    in order to better organize the documentation of the various AMSAT-DL hardware and software projects, we have now created a dokuWiki especially for this purpose.


    here the link --> https://wiki.amsat-dl.org


    This should hopefully be clearer and easier to update than directly on the homepage or here in the lexicon.


    Special thanks also to the authors, Matthias DD1US and Kurt dj0abr for providing and maintaining the contents.



    73s Peter

    It's a bit strange as there does exists a system called 'rsid' (*) that does allow easy identification of a digital signal.
    Why do people not use this feature?
    Do people not know that this exist? It is a standard feature of gqrx, so I guess other SDR software will also have it.

    (*) http://www.w1hkj.com/RSID_description.html

    Hi Kristoff,


    I assume most people on QO-100 might even not know GQRX and thus not about RSID.


    I also hear about RSID for the first time, but the idea behind sounds good.


    Perhaps Kurt can implement this in HSMODEM too.


    73s Peter

    Thanks Peter!


    I agree there is nothing wrong with QO-100 :) - our investigation mostly focused on the frequency accuracy of the transponder LO to determine the source of the frequency offset that was observed, not so much on its frequency stability.

    Hi Wouter Jan,


    Thanks! Yes - absolutely correct regarding frequency accuracy and stability.. indeed both are covered and referenced above, while originally analyzing the short term frequency stability, an offset of ~70 Hz in frequency accuracy has been indeed observed.. I should have better emphasized this...


    73s Peter

    from AMSAT-UK, see https://amsat-uk.org/2021/03/22/soyuz-2-launch/


    The Soyuz‑2.1a LV was launched from Baikonur in Kazakhstan on March 22, 2021. The following satellites, operating in frequency bands allocated to the amateur satellite service have been coordinated by the IARU Satellite Frequency Coordination Panel:

    • Beesat‑5

    • Beesat‑6

    • Beesat‑7

    • Beesat‑8

    • FEES

    • SMOG

    • GRBAlpha

    • KSU_Cubesat

    • DIY‑1

    • STECCO

    • CubeSX-HSE

    • CubeSX-Sirius-HSE

    • Orbicraft-Zorkiy

    • NanoSatC-BR2


    Operating in frequency bands allocated to the amateur satellite service without IARU frequency coordination is KMSL. Additional satellites may follow.


    Operating in frequency bands allocated to the amateur satellite service while the IARU Satellite Frequency Coordination Panel has declined coordination are UNISAT‑7 and WildTrackCube-Simba.


    Further information including the IARU coordinated frequencies at http://amsat.org.uk/iaru/

    Quote

    At least here in ON-country- there are in fact situation where encryption is not only allowed but even mandatory.

    1. - emergency communication carrying information about individuals.
    2. - to remotely control amateur-radio infrastructure,
    3. - to remotely control amateur-satellite radio infrastructure

    There is a general misunderstanding between 'security', 'safety', 'privacy' and 'authentication'


    In particular for Point 2. and Point 3. encryption is absolutely not required. On all P3-Satellites we never used encryption, but authentication.. There was no need to hide the commands, but indeed you wanted to make sure that only real command stations could execute commands. So instead of encryption, the protection was using a kind of trustable signature..


    73s Peter

    Hi Kristof,


    Quote

    If the message itself cannot be decoded -because it is encrypted emergency communication or some new experimental mode-, the listeners have no way to verify if that is indeed a message from that station.


    And this would be illegal anyway and I assume the user community will quickly start to find out what it is and start counter actions, as we have seen in the past.. quite successful actually.


    I assume that any proposal to experiment with new modes here on the transponder will follow the guidelines, international and local regulations, therefor it needs to be fully documented before any experimental transmissions takes place, to allow others to decode. Otherwise it would be treated as illegal..


    73s Peter

    Hi Kristoff,


    As far as I know, the proper standard "identification signal" given by ITU and local regulators for "experimental" modes is either speech or morse code for the callsign. It may also be possible to use other digital formats as long as they are well-known standards in amateur radio, easy to identify or decode. For example the "callsign" field in AX.25 Packet Radio became such a standard and Morse code identification was only required in the very early days.


    Indeed we are looking forward to see and learn more about your experiments than..


    73s Peter

    I opened my Opticum LTP-04H and it looks very different from the ones you have..

    Did you buy it recently??

    It's seems to be an very old one, obviously with DRO instead of XTAL and PLL..

    You can scrap it...


    Edit: Just noted.. on the sticker: yours is "blue" line, the correct one is "red" line.. so it's not the same..

    Version 3 February 2021 – The following updated DATV (DVB-S2) bandplan and guidelines are designed to enable the most efficient use of the QO-100 wideband transponder (WB) for all amateur radio satellite users. Please make sure that you understand the guidelines and follow them accordingly. The use of DVB-S2 as the most efficient transmission mode is advised.



    https://amsat-dl.org/en/p4-a-w…and-operating-guidelines/


    or for direct Download: QO-100 WB Transponder Bandplan V3

    this morning ISRO launched several satellites with frequencies in the amateur satellite spectrum, unfortunatly all of them seems to be without IARU coordination..

    • SDSAT 3 at 435.500 Mhz (uncoordinated)
    • GHRCESat at 437.500 Mhz (uncoordinated) and at 436.000 Mhz (uncoordinated)
    • JITSat 1 at 437.500 Mhz (uncoordinated) and at 436.000 Mhz (uncoordinated)
    • SSIETSat 1 at 437.500 Mhz (uncoordinated) and at 436.000 Mhz (uncoordinated)

    I've also got my BETA tester pre-order announcement by direct eMail :-)


    But here is something more interesting to learn about the antenna itself:


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    Enjoy, 73s Peter

    Hello,


    here is the link for tomorrow live stream of Mars2020 until cruise stage separation from Bochum


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    I will start the stream about 1h before cruise stage separation at 20:38 UTC, which is 10 minutes before EDL..


    73s Peter

    You are seeing a live spectrum view from Tianwen-1 telemetry transmitter received by the 20-Meter Antenna at the Bochum-Observatory in Germany. Tianwen-1 ("questions to heaven," or "questioning the heavens") is a Mars mission by China consisting of an orbiter and rover. It launched in July 2020 and enters Mars orbit on 10 February 2021 around 12:00 UTC. The rover will not land until May. Mission Lead: CNSA
    Follow us on Twitter: https://twitter.com/amsatdl
    For more details about our antenna: https://amsat-dl.org/en/20-meter-ante...


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    Tune in into our live stream and listen to the Emirates Mars Mission (EMM) Hope Probe when it arrives at Mars. We will track EMM with our 20-Meter Antenna at the Bochum Observatory about 2 hours before orbital insertion. Fingers crossed for HopeProbe!




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