Posts by DB2OS

    The presentations are now available on YouTube:





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    We congratulate all those honoured for their contribution to AMSAT-DL and the Amateur Satellite Community (random order):


    James Miller G3RUH, Erich Eichmann DK1TB, Achim Vollhardt DH2VA, Michael Fletcher OH2AUE, Jens Schoon DH6BB, Mario Lorenz DL5MLO, Tilman Glötzner DG2TG, Florian DF2ET, Matthias Bopp DD1US, Kurt Moraw DJ0ABR, Thomas Kleffel DG5NGI, Stefan Reimann DG8FAC, Noel Matthews G8GTZ, Dave Crump G8GKQ, Mikio Mouri JA3GEP, Felix Riess DL5XL, Elke DH5SEL and Martin Blanz DL9SAD, Gerhard Müller DC6PN, Harald Orlamünder DF3TY, Rosita DG4SAR and Georg Sigmund DG3SBJ, Hartmut Behle DL2KCA, Ulf Drewes DL2YFA, Hartmut Pässler DL1YDD, Frank Sperber DL6DBN, Ralph Lampenscherf DG1EFR, Hans-Werner Klein DL5AA, Nicole Sehrig, Daniel Estévez EA4GPZ, Thomas Frey HB9SKA, Alan Antoine F4LAU, Holger Eckardt DF2FQ, Robert Knoblach DD4YR, Gary Immelmann ZS6YI, Jogesh Dewan A75GM, Marcel Krisp, Dirk Fischer, Mike Rupprecht, DK3WN, Guido Elsner DL9DBP.


    The countdown has begun and we are only a few days away from our celebratory conference, symposium and general meeting. Those who have not yet booked their participation in the symposium and supporting program should do so as soon as possible. as soon as possible in the AMSAT-DL Shop. There are also only a few accommodations left, so book quickly!


    Agenda and more, here: https://amsat-dl.org/en/countd…sary-celebration-meeting/

    according to Mario DL5MLO "geosynchronous orbit in 460km altitude" is indeed a mistake.

    The satellite is planned for a "sunsynchronous orbit SSO in 460km" altitude.


    Please also note that the frequency coordination is not yet completed, the above is only early notification!

    Dear All,


    As Guillaume F4HDK pointed out, we are currently in deep discussion with him regarding his NPR-VSAT solution for QO-100.


    To get a broader agreement and acceptance we will establish an “expert team” to review and investigate the following areas:

    • Technical Feasibility
      • performance (modulation, FEC, bandwidth, required power).
      • non-interference (mainly due to pulsed uplinks) with DATV.
      • look at the major strengths and weaknesses.
      • other technical aspects.
      • setting-up a HUB at AMSAT-DL in Bochum.
    • Coordination and band planning
      • interoperability and compatibility with other modes.
      • proposal for a new WB-Transponder bandplan.


    The “expert team” will prepare a proposal to AMSAT-DL for a final decision and implementing.


    Everyone might understand that there is a complex “management/political” decision to be made at the end. While it will be difficult to make everyone happy, we have to make sure that the solution that is deployed is technically sound and accepted by most users. Also, we want to treat everyone fair and not favour or disfavour one mode of operation.


    On the other hand, Guillaume invested a lot of time in this very exciting project and we want to value the efforts and contribution he makes to the community. Indeed, there is always potential for improvement.


    As he says, the ultimate goal could be a permanent HUB, ideally located in Bochum with access to the HamNet. But to be clear: this would be for direct User / Client access only. Gateways or traffic between Gateways will not be permitted and this is not planned by design either.



    Until then, please make sure to follow the WB bandplan and general guidelines before starting any experimental transmissions (which is required for anyone on the WB-transponder anyway):

    • All transmitting stations shall monitor the wideband spectrum monitor.
    • All transmitting stations shall monitor the co-ordination chat window.
    • All experimental transmissions shall only be inside the reserved 1 MHz section for “experimental modes” just beside the DATV-Beacon.
    • All transmissions will be limited to short duration tests (~30min).

    If we see during the evaluation that there are no problems, we may gradually extended those periods. For example, for those times of the days where there is not much other activity.



    Watch this space!



    Best 73 de Peter, DB2OS

    President AMSAT-DL and QO-100 Project Leader

    Hello OK9SGC and welcome to the board!


    Technically possible, but as far as I know it's not legal to retransmit any transmission from Eumetcast.


    Even if for individuals (non-commercial use) the license is free, you still need the personalized USB key and they exactly want to know who is receiving it? We can try to contact Eumetsat to check what's possible..



    73 Peter

    Hi Ed,


    I think the downstream bandwidth will just be too widewith the available minimum Symbolrate of 2.5 Msps and Datarate 2.5 Mbps for the WB transponder...


    73s Peter

    Hi Conrad,


    the 75 Ohm cable from the LNB to your down converter or SDR is not critical as typical LNB's have around 60dB of gain. With only 10m of cable, absolutely no problem.


    The only reason to use better quality cable would be if you need a better shielding, for example when you are close to a mobile network operating in the 800-900 MHz IF of the LNB. Perhaps look for cables with good shielding designed for outdoor.


    There are a lot of good SAT-Shops, but Amazon should also do fine. Reichelt.de is also a good resource.


    73s Peter

    Hat diese absichtliche (?) Miss-Nutzung irgendwelche Konsequenzen für den Betreiber?

    Moin Rainer,


    ich fürchte nicht, offensichtlich ist man da mit ja durchgekommen.. und wo kein Kläger... IARU?


    Spätestens zum Jahresende werden wir es wissen, dann sind mehre Nachfolger geplant... vielleicht hat sich hinter den Kulissen etwas getan...


    73s Peter

    The following CubeSats have been deployed from the ISS:


    SPORT – 6U Brazilian Space Agency (AEB), the Technical Aeronautics Institute in Brazil (ITA), the National Institute for Space Research in Brazil (INPE), NASA’s Marshall Spaceflight Center, with Participation from Utah State University, The Aerospace Corporation, NASA’s Goddard Spaceflight Center, and University of Texas at Dallas (NASA CubeSat Launch Initiative)

    LORIS – 2U Dalhousie University- Canadian CubeSat Project (Canadian Space Agency)

    ORCASat – 2U University of Victoria – Canadian CubeSat Project (Canadian Space Agency)

    DanteSat –3U NPC SpaceMind (Italy)

    NUTSat – 2U Gran Systems (Taiwan)

    petitSat – 6U NASA Goddard (NASA CubeSat Launch Initiative)

    MARIO – 3U University of Michigan (NASA CubeSat Launch Initiative)

    TJREVERB – 2U Thomas Jefferson High School, Virginia (NASA CubeSat Launch Initiative)



    IARU coordinations:

    LORIS (finished) - IARU Sat Coordinator

    ORCASAT (finished) - IARU Sat Coordinator

    TJREVERB (finished) - IARU Sat Coordinator

    NUTSAT (finished) - IARU Sat Coordinator

    DANTESAT (declined) - IARU Sat Coordinator

    MARIO (finished) - IARU Sat Coordinator


    More info:

    https://community.libre.space/…2022-12-29-12-05-utc/9919

    Hello OM,


    The CAMSAT XW-4 (CAS-10) satellite was launched into the Chinese Space Station on November 12, 2022 aboard China's Tianzhou-5 cargo spacecraft, and was launched by the Long March-7 Y6 launch vehicle from the Wenchang Launch Center in Hainan, China. It is currently planned that the XW-4 (CAS-10) satellite will be separated from the Chinese space station and enter operational orbit at 01:30 UTC on December 18, 2022.



    Attached is the CAMSAT XW-4 (CAS-10) Amateur Radio Satellite User's Manual V1.0, for your reference.


    XW-4 (CAS-10)_TLE_20221216.txt

    CAMSAT XW-4 (CAS-10) Amateur Radio Satellite User's Manual V1.0.pdf


    73

    Alan, BA1DU

    CEO of CAMSAT