Posts by HB9SKA

  • Call for help.

    Hello Harry


    You have an app with Qt5 for GUI and keyboad. Qt5 is available for Linux, Windows and OS/2-ArcaOS. You have to download and install Qt5 first. Google for it or look into docs from the app developer.

  • European Space Agency GEO Satellite Opportunity

    In ANS-344 AMSAT News Service Weekly Bulletins is an article about the "Proposal Submitted to ESA for Geostationary Microwave Amateur Payload" from AMSAT-UK and BATC. My personal meaning is this proposal is too one-sided in favor of the microwave bands. The usual bands, 2m & 70cm, should also be taken into account as on AO-40 and P3E. We should also revive the 23cm band. After ITU WRC-23 there should be no problem. See article here...


    What do you think ?

  • Amsat in der Presse

    Lieber Armin DH1DA


    Da hast Du natürlich recht, aber die Mitteilung ist so schlecht geschrieben, da stehen mir die Haare zu Berge. Ich schreibe ja auch schon einige Jahre Artikel und kann dies beurteilen. Es braucht ja auch kein wissenschaftlicher Aufsatz zu sein, aber ein korrekt verfasster Text (AMSTA, Mittelwelle) hätte der Sache besser gedient. Und wenn man einer technisch/wissenschaftlichen Sache nicht sicher ist, kann man es heutzutage googeln und lernt erst noch etwas dazu.


    73 und schöne Feiertage

  • Amsat in der Presse

    Na ja, der Artikel wurde nicht gerade von einem Wissenschafts-Journalisten geschrieben. Wenn ein Aussenstehender nach der Organisaton AMSTA sucht, wird er nichts gescheites finden. Und ich wusste gar nicht, dass wir auf Mittelwelle senden. Da gräbt dann wohl mancher sein altes MW-Radio aus. ;)

  • ISS SSTV Event December 7-8, 2023

    Russian cosmonauts on the International Space Station (ISS) are planning to transmit Slow Scan TV (SSTV) images on 145.800 MHz FM probably using the SSTV mode PD-120.

    The transmissions are part of the Moscow Aviation Institute SSTV experiment (MAI-75) and will be made from the amateur radio station RS0ISS in the Russian ISS Service module (Zvezda) using a Kenwood TM-D710E transceiver. It appears the theme for this session will highlight one of MAI's cosmonaut graduates - Yuri Usachov. Currently scheduled days and times are:

    Thu 2023-12-07 08:55 UTC to 14:25 UTC :thumbdown:
    Fri 2023-12-08 08:15 UTC to 14:10 UTC

    Days and times are subject to change due to the operational requirements of the ISS.

    Reminder - No ARISS award will be available for this session since it is not transmitted globally.

    [ANS thanks Charlie Sufana, AJ9N, one of the ARISS operation team mentors for the above information.]

  • European Space Agency GEO Satellite Opportunity

    At the recent RSGB Convention / AMSAT-UK Colloquium at Milton Keynes, Frank Zeppenfeldt, PD0AP, from the European Space Agency Satellite Communications Group, made a presentation on the subject of a future ESA backed amateur satellite mission to GEO. Frank has obtained funding of 250,000 Euro to investigate the possibility of an Amateur satellite or payload to be placed in GEO orbit. The presentation emphasises innovation and microwave communications.

    Franks full presentation is available on YouTube

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    [and here at the AMSAT-DL colloquium:

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    As a member of the UK microwave / Satellite community, we would like to invite you to contribute to the design concept of this mission.
    We would welcome any thoughts you may have via e-mail etc and we will add those to the overall discussion.

    In a follow up Teams meeting on Wed 1st Nov between Frank and AMSAT-UK, it became clear that an ideal solution from an ESA perspective should provide a service to amateurs in Canada as well as Europe. - Canada is an ESA co-operating state. Note that any GEO covering part or all of Canada will also cover a significant proportion of The USA. AMSAT-UK is working to identify a suitable range of GEO slots which meet this requirement.

    What is needed, is a proposal for 2 or 3 ideas for what this GEO mission (most likely a hosted payload) should include. See notes / Franks presentation.

    AMSAT-UK aims to respond with some proposals by Dec 4th. These do not need great detail, but should justify bands used and other ideas.

    For Example.
    What bands should be included. - This project is not aimed as a QO-100 replacement.
    Is 24G and up practical? Can a ground station generate enough power economically with today's available technology for an uplink on 24/47/76G
    Given a resource in space, is there an 'easy' entry level on say 24G - RX or TX so we can attract new microwave operators.
    Should the transponder/s be old style bent pipe configurations or contain on board processing to decode RX signals then encode the downlink?
    What digital protocols are appropriate for the above?
    Is 5.6G viable as an uplink given the WiFi presence? Any observations on 6cm interference would be valuable.
    Note: The antennas on the satellite will likely have a min gain of 20dB as this covers the visible portion of the Earth from geostationary orbit.

    In recent discussions with BATC etc we have concluded that a 10G downlink should be the baseline to take advantage of the large existing userbase and that a minimum power output onboard needs to be 10W into a 20dB antenna.


    If the proposals are considered substantial enough for further discussion, we have suggested a meeting at the ESA technical centre in The Netherlands around end Feb / March next year. This 2 day (?) event would be funded by ESA probably via A-UK. If this meeting happens, then representatives from A-UK BATC and UK microwave group could attend along with other groups from The EU and USA so we can take the project forward.

    Frank anticipates doing some initial prototyping and then present the findings to a meeting of GEO platform operators next year. Hopefully this will find a commercial partner with a platform going to an appropriate GEO slot.

    If any of this is of interest, please let us know your thoughts.
    This is a rare opportunity. I hope you can give it your support.


    Regards


    David G0MRF / Noel G8GTZ