Posts by DB2OS

  • NPR-VSAT : IP access over QO-100 WB

    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

  • Meteosat image beacon on QO-100

    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

  • IP over DVB-S2

    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

  • LMR-400-75 and F types where to buy in EU

    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

  • BLUEWALKER-3

    Quote from DG8KD

    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

  • ISS CubeSat Deployment NRCSD#24 (Nanoracks)

    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

  • CAMSAT XW-4 (CAS-10)

    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

  • CAS-5A launched

    Here is the launch video from CAS-5A


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  • CAS-5A launched

    Hello OM,


    The CAMSAT CAS-5A amateur radio satellite will be piggybacked on the Smart Dragon-3 Y1 launch vehicle and launched from the sea launch platform in the Yellow Sea at UTC 06:35:02 on December 9.



    CAS-5A deployment orbital elements:


    Flight Time 724.670s
    Semi-major axis 6926.918 Km
    eccentricity 8.143e-04
    Orbital inclination 97.524°
    Pergee height (relative to equatorial radius) 543.140km
    Apogee altitude (relative to equatorial radius) 554.422km
    Longitude of the ascending node 298.491°
    Perigee angle (for reference only) 188.413°
    True near point angle (for reference only) 344.096°
    Flat near point angle (for reference only) 344.121°
    Orbital period 5737.479 s
    Absolute speed 7591.699 m/s
    Absolute speed local inclination -1.278e-02°
    Geodetic longitude 119.477°
    Geographic latitude 7.475°
    voyage 3336.983 km


    The user's manual of CAS-5A satellite will be available later.


    73!
    Alan Kung, BA1DU

  • VK9QO Cocos (Keeling) Island on QO-100

    New DXCC Entity VK9QO will be on the Air between 25-31, October 2022.

    Operation schedule and QSL information is as follows:


    Location 1: 25 -27 Oct 2022

    Cocos (Keeling) Island (VK9C) Local Time=UTC + 6.5hr

    12°05’S 96°53’E GL: NH87JT (Az: 274.1 deg Elv: 10.1 deg)


    Location 2: 28 – 31 Oct 2022

    Christmas Island (VK9X) Local Time=UTC + 7.0hr

    10°29’S 105°39’E GL: OH29UN (Az: 271.9 deg Elv: 1.7 deg)



    The operator, Mikio JA3GEP, will try to QRV mainly late afternoon and early morning UTC. He operates split. He will listen 5 kHz or more higher frequencies only.


    LoTW and eQSL, as well as paper-QSL, will be handled.

    Please visit JAMSAT-HP https://www.jamsat.or.jp/?p=2001 for detailed QSL Information.


    This activity is supported by ICOM Inc. and JAMSAT(Japan AMSAT).


    QSO with VK9QO is valid for “JAMSAT 50th Anniversary Award 5 points bonus”.

    See https://www.jamsat.or.jp/?p=1854


    Thank you for your interest.

    JA3GEP, Mikio Mouri PM75XA