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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/6SMKDPGLYFYVYRBPZNXDAKJ57N7Z2BMG/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "[email protected]",
    "message_id_hash": "6SMKDPGLYFYVYRBPZNXDAKJ57N7Z2BMG",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/6SMKDPGLYFYVYRBPZNXDAKJ57N7Z2BMG/",
    "sender": {
        "address": "pa3fym (a) amsat.org",
        "mailman_id": "5f42a625d6474192905b3f519de084db",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/5f42a625d6474192905b3f519de084db/emails/"
    },
    "sender_name": "Remco",
    "subject": "[amsat-bb] EsHail Microwave transponder satellite",
    "date": "2016-05-31T10:07:22Z",
    "parent": null,
    "children": [
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/U4F5DVTS3GSX6R54IGS2PRCIR2UXU42O/"
    ],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": ">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 ?\nI will use a cheap injection locked X-band PLL LNB with dielectric rod \nand additional converter to let the NB transponder land inside one of the \nbands my transceivers accomodate.\nFor the S-band uplink a dedicated (simple!) TX converter is now prototyped.\nOutput 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 \nbench with this drive. Of course uplink output can be tweaked.\nI am also busy with the dual band feed, of which the downlink of course is inside the LNB.\n\nFor the uplink I made a 6 turn LHCP helix but am now fiddling with the matching due to \nmechanical boundary conditions. At this moment of writing I (still) haven't a good match\nbut I reckon this mechanical issue will be solved soon.\nSecondly I need to experiment with the phase centers of both up- and downlink\nto maximise overall efficiency. Even when I'm not able to equalise both phase centers\nI have some room in my uplink budget to compensate for suboptimal illumination.\nIn my prototype the LNB looks 'through' the helix.\nAntenna will be a Triax 88cm broadcast satellite dish with f/D of around 0.6.\nAll internal frequencies will be/are locked to GPS which allows my idea of building a \nSUT (satellite user terminal) [for portable use] in conjunction with one (1) transceiver.\nIn other words, my concept will be that Es'hail2 behaves like a normal \namateur band, albeit with some delay ;-)\nRemco PA3FYM \n\n\n",
    "attachments": []
}