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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/U4F5DVTS3GSX6R54IGS2PRCIR2UXU42O/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "CAJdc4v4g7dMYjr-3i6BOues2ZLmm79mEViBGtHiXCnsrgowRjQ@mail.gmail.com",
    "message_id_hash": "U4F5DVTS3GSX6R54IGS2PRCIR2UXU42O",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/6SMKDPGLYFYVYRBPZNXDAKJ57N7Z2BMG/",
    "sender": {
        "address": "rico.van.genugten (a) gmail.com",
        "mailman_id": "64397f008c1d4d7a8656e4f690b21e7f",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/64397f008c1d4d7a8656e4f690b21e7f/emails/"
    },
    "sender_name": "Rico van Genugten",
    "subject": "Re: [amsat-bb] EsHail Microwave transponder satellite",
    "date": "2016-05-31T14:28:48Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/6SMKDPGLYFYVYRBPZNXDAKJ57N7Z2BMG/",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Hi Remco,\n\nSounds like you made a lot of progress on your Es'HailSat2 groundstation\nalready. I would be interested to learn more about your transverter design\nand where you got the UMTS PA, and I'm sure some other people on this list\ntoo. :)\n\nRico PA3RVG\n\n\n\nOn Tue, May 31, 2016 at 12:07 PM, Remco <[email protected]> wrote:\n\n> >What are other folks planning to use on the uplink 2400 MHz and the down\n> >link at 10,489 MHz, for the narrowband linear transponder ?\n> I will use a cheap injection locked X-band PLL LNB with dielectric rod\n> and additional converter to let the NB transponder land inside one of the\n> bands my transceivers accomodate.\n> For the S-band uplink a dedicated (simple!) TX converter is now prototyped.\n> Output of the converter will be around 5 dBm to be inserted in an old UMTS\n> (2.1 GHz) module, capable of delivering around 20 - 30W at 2400 MHz on the\n> bench with this drive. Of course uplink output can be tweaked.\n> I am also busy with the dual band feed, of which the downlink of course is\n> inside the LNB.\n>\n> For the uplink I made a 6 turn LHCP helix but am now fiddling with the\n> matching due to\n> mechanical boundary conditions. At this moment of writing I (still)\n> haven't a good match\n> but I reckon this mechanical issue will be solved soon.\n> Secondly I need to experiment with the phase centers of both up- and\n> downlink\n> to maximise overall efficiency. Even when I'm not able to equalise both\n> phase centers\n> I have some room in my uplink budget to compensate for suboptimal\n> illumination.\n> In my prototype the LNB looks 'through' the helix.\n> Antenna will be a Triax 88cm broadcast satellite dish with f/D of around\n> 0.6.\n> All internal frequencies will be/are locked to GPS which allows my idea of\n> building a\n> SUT (satellite user terminal) [for portable use] in conjunction with one\n> (1) transceiver.\n> In other words, my concept will be that Es'hail2 behaves like a normal\n> amateur band, albeit with some delay ;-)\n> Remco PA3FYM\n>\n>\n> _______________________________________________\n> Sent via [email protected]. AMSAT-NA makes this open forum available\n> to all interested persons worldwide without requiring membership. Opinions\n> expressed\n> are solely those of the author, and do not reflect the official views of\n> AMSAT-NA.\n> Not an AMSAT-NA member? Join now to support the amateur satellite program!\n> Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb\n>\n",
    "attachments": []
}