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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/LJETGLY73HSD2URCNCKWLAWDHO3HJ7LA/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "CAJdc4v6Tea0s6Vgai-U=vtL0Vvhkgbj+itxMrV5+FtmJgwAZ5A@mail.gmail.com",
    "message_id_hash": "LJETGLY73HSD2URCNCKWLAWDHO3HJ7LA",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/HXM3UC3FMYMVJO6XEMVXZKHYCM5SRFTV/",
    "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": "2016-05-31T08:01:02Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/HXM3UC3FMYMVJO6XEMVXZKHYCM5SRFTV/",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Hi Stan (and others),\n\nFor the downlink I'm going to use an off-the-shelf dish and LNB coupled to\nan SDR. The LNB should have high gain and be very frequency stable. The\nOctagon Optima series LNB's get a lot of praise and are very well suited\nfor this task, and they're cheap too: I picked up one for about 15 dollars,\ncheck ebay. The local oscillator is at 9750 MHz, so to receive the start of\nthe pass band at 10489.55 MHz the SDR should be tuned to 739.55 MHz, most\nSDR's should be capable of that. The pass band is a little bit below the\nspec of the LNB which starts at 10700 MHz, but according to the\nmeasurements done on the oe7forum linked below the -3 dB point of the LNB\nis at 10048 MHz, so it should work just fine.\n\nSee also:\n - Octagon LNB spec:\nhttp://www.oe7forum.at/download/file.php?id=1363&mode=view\n - Octagon LNB test: http://www.g4jnt.com/pll_lnb_tests.pdf\n - Description of a 10 GHz ground station (in german unfortunately, but the\npictures say a lot) http://dl3jin.de/10ghz_rx.htm\n - There is a lot of activity in Austria, maybe because satellite operation\nwith the current flock of birds is difficult when your horizon starts at 30\ndegrees elevation. :) http://www.oe7forum.at/viewtopic.php?f=42&t=468\n\nFor the uplink it's going to be something like a 70cm SSB-capable set, a 13\ncm transverter, a PA if really necessary (but hopefully not when the\nantenna gain and transverter output are high enough), all still to be\nacquired.. The antenna is going to be a helical feed in the same dish as\nthe LNB, or maybe something like this, I'm not sure yet:\n - Quad helix array (sorry, german again): http://dl3jin.de/13cm_helix.htm\n\n73,\nRico PA3RVG\n\n\nOn Tue, May 31, 2016 at 2:12 AM, Stan, W1LE <[email protected]> wrote:\n\n> Hello The Net,\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>\n> Stab, W1LE    Cape Cod   FN41sr\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": []
}