Posts by HB9SKA

  • PRECURSOR satellite

    Hallo Peter


    In the SATELLITE DESCRIPTION you can read "The main experiment is a new generation propulsion system for Orbital Plane Change (inclination) and/or Orbital Altitude Change and uses green propellant." I think the sat will be shot from LEO in a higher orbit. Further infos will follow, hopefully.


    CU in Friedrichshafen


  • PRECURSOR satellite

    Source: https://iaru.amsat-uk.org/formal_detail.php?serialnum=916


    PRECURSOR Updated: 28 May 2023   Responsible Operator Mario Lorenz DL5MLO Supporting Organisation Spectrum Aerospace Technologies UG Contact Person dl5mlo@amsat-dl.org.nospam Headline Details: PRECURSOR is 15cm x 30cm x 60cm, 18kg weight (including propellant). \it is planned to be launched on an experimental/test flight on a LandSpace ZQ-2 to a geosynchronous orbit in 460km altitude. Current estimates predict a mission lifetime between 1 and 5 years, depending mainly on solar activity and success in the primary mission. The primary mission of PRECURSOR is the in-orbit- verification of an electric propulsion system within ~ 6 months after launch. Due to the power demands of the electric propulsion system, the satellite includes significant electrical power collection capabilities. Once the propellant (reaction mass) for the propulsion system is used up, the power budget allows for several secondary missions: Amateur Radio: - Provide an U/V amateur radio transponder - Enable S/C tracking using telemetry - Provide a software defined wideband L/S amateur radio transponder and/or signal source Educational experiments: - an onboard computer using an intra-satellite wireless bus system (University of Wuerzburg) - radiation sensors - GNSS experiments including a software defined GNSS system (ETH Zurich, Fraunhofer IIS Erlangen) - LPWAN technology verification (Fraunhofer IIS Erlangen) - two cameras - various antenna systems.Other than collecting telemetry and learning about satellite operating environment, an 25kHz linear, bent- pipe Mode U/V will support direct amateur radio operation and involvement. A software-defined wideband L/S transponder will allow for direct amateur radio operation and involvement. Being software-defined, its characteristics can be modified while it is in orbit by uploading new software. On a time-shared basis, this transponder can be used as a bent-pipe transponder, a regenerating transponder, or as a signal source carrying telemetry or live video. For a typical user station, a 250kbit/s link is planned, sufficient for narrowband DATV operations. Stations putting more effort into their ground stations could benefit from higher bandwidths, enabling (2..5 MHz). Other than a purely linear transponder, regenerative transponders of varying modes can be experimented with. This would include 5G and IoT waveforms. We expect to turn on the U/V transponder after initial checkout of spacecraft, about 1 month after launch. L/S transponder will be operated on a time-share basis depending on available power and mission requirements. Proposing VHF and S Band downlinks with 9k6 GMSK telemetry with CCSDS formatting. Planning a launch from Jiuquan Satellite Launch Center in Q4 2023. More info at http://precursor.space/#_SATELLITE_DESCRIPTION Application Date: 23 May 2023 Freq coordination completed on 01 Jan 1970

    The IARU Amateur Satellite Frequency Coordination Status pages are hosted by AMSAT-UK as a service to the world wide Amateur Satellite Community


    Infos:

    http://precursor.space/


    I think there is something wrong with the orbit specification.


    But WOW, this will be a next super HAM satellite :!::):thumbup:

  • DX-Adventure: 4U100QO - 4U1A



    Dear HB9SKA,

    DX-Adventure is proud to announce a partnership with the United Nations Amateur Radio Contest DX Club (ARCDXC).

    During 18 | 19 | May 20th we have the scoop to make the very first QO-100 connections from the United Nations - Vienna International Center.

    On the occasion of this activation, there is a special call sign 4U100QO.

    As a token of appreciation, DX-Adventure is donating the equipment so that connections can be made through QO-100 in the future.

    This cooperation embodies the spirit of international cooperation and exchange that the United Nations aspires to.

    DX-Adventure would therefore like to express its sincere thanks and appreciation to the sponsors.

    Your contribution has enabled us to take our QO-100 station and partnership with the United Nations Amateur Radio Contest DX Club (ARCDXC) to new heights.

    During this activation we will also be active on HF with the call sign 4U1A.

    73

    DX Adventure team
    www.dx-adventure.com




  • OSCAR - News April 2023

    OSCAR - News

    Das erste deutschsprachige, unabhängige Bulletin über AMSAT und HAM-Space

      Neu in Ausgabe April 2023:

  • IO-117 / GreenCube Dekodierung

    Hmmm... Für mich hört sich das Signal wie Packet Radio an. Da gibt es ein Mark- und Space-Signal. Das eine liegt bei 1200 Hz und das andere bei 2200 Hz, das sind die sog. Bell-Töne. Bei SSB muss der RX dazu frequengenau eingestellt sein. Ob diese Töne nun mittels FSK oder QPSK übermittelt werden, ist an und für sich egal. Bei QPSK könnten noch 2 Hilfstöne mitgesendet werden, aber es würde mich wundern, wenn die einen ganzen horizontalen Balken darstellen. Das sieht mir eher nach einem Softwarefehler aus, aber bei QPSK lasse ich mich gerne belehren.


    Mit meinem alten Kantronics-TNC habe ich unlängst SwissCube in FSK(USB) decodieren können. Voraussetzung dazu ist, dass das AX.25-Protokoll verwendet wird.

  • IO-117 / GreenCube Dekodierung

    Hallo Oliver


    Wenn ich IO-117 mit meinem Audioprogramm im Wasserfall empfange, sehe ich zwischen den Paketen kein horizontales Signal, nur die beiden Pakete links und rechts. Einen VV solltest Du montieren.

  • EP-AB003 linearity

    Quote from PA5Y

    Or are you suggesting that I do not know how to measure the gain of an amplifier :)

    Absolutely not Dear Conrad ;) You are more profi than I. This was only an info for you. I'm not a RF-technician, I use most of my gear in original state.

  • EP-AB003 linearity

    Post
    Under-performance of EP-AB003 WiFi amplifier
    Hello all,

    My EP-AB003 "8W" amplifier works but only has 11.5dB gain as opposed to the claimed 17dB so I get +29.1dBm out for +17.6dBm in. At the moment I don't have more drive available to see if I get more power output for more input. Lack of output power seems to be a common but not universal complaint about these units.

    Anyway, I took the lid off and have noticed that there are some suspicious white blobs of what looks like foam on some pins of the device associated with the output combining…
    G4SDG