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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/P54ISCL54454F3CC6VUWOCUR4T33PWYE/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "P54ISCL54454F3CC6VUWOCUR4T33PWYE",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/P54ISCL54454F3CC6VUWOCUR4T33PWYE/?format=api",
    "sender": {
        "address": "wjubbels (a) gmail.com",
        "mailman_id": "3d3f4b2ab73749eea150ce913c522e3d",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/3d3f4b2ab73749eea150ce913c522e3d/emails/?format=api"
    },
    "sender_name": "Wouter Jan Ubbels",
    "subject": "[amsat-bb]  Delfi-C3 RASCAL tuning & TLE's",
    "date": "2008-04-30T15:08:02Z",
    "parent": null,
    "children": [
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/TON5VC2C47KCA5PTVWPP57AY74DCKJEN/?format=api"
    ],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Hi all,\n\nwe have added a section to our RASCAL tuning guide in order to make\nachieving sync in RASCAL easier, see\n\nhttp://www.delfic3.nl/index.php?option=com_content&task=view&id=94&Itemid=123\n\nI have also included it in this mail for clarity:\n\nTuning can sometimes be difficult, in the presence of Doppler shift, fading\ndue to polarization changes, frequency offset due to temperature of the\nspacecraft oscillators and there is the possibility that the Costas Loop\nindicates a false sync because of lock on one of the signal's sidebands. If\npossible, you can use a waterfall display in software like MixW running\nparallel to RASCAL which will give you an indication of the centerfrequency.\nDuring transmission of AX.25 flags, the actual carrier frequency is the\nhighest peak in the spectrum, with a couple of sidebands exactly 150Hz\napart, looks like a comb. Now, using the waterfall display, tune such that\nthis highest peak corresponds to 1600Hz +/-100Hz, in order to achieve sync.\n\nFurthermore, Delfi-C3 is now listed on celestrack with identifier DELFI-C3 ,\nas object #32787, these TLE's are also on our mission ops page.\n\nToday we also verified that our backup command receiver functions well, we\nare still working on the TX drop out issue.\n\n73 on behalf of the Delfi-C3 team,\n\nWouter Jan Ubbels PE4WJ\n",
    "attachments": []
}