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    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/2XJYWD4PKF3KGWT4HFBESRUI74QNFK7B/?format=api",
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    "message_id": "[email protected]",
    "message_id_hash": "2XJYWD4PKF3KGWT4HFBESRUI74QNFK7B",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/KMX7JNE3JKZQIQQLXOACJNQH2GA7TPG3/?format=api",
    "sender": {
        "address": "kene (a) braxtontech.com",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "Ken Ernandes",
    "subject": "[eagle] Re: Proposed Eagle Antenna Arrays",
    "date": "2006-09-27T19:13:49Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/6E2SPEXTUXTVZNESTON4KNM2ADR7HV2R/?format=api",
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    "content": "That sounds like an interesting math problem to me!\n\n73, Ken N2WWD\n\n  -----Original Message-----\n  From: [email protected] [mailto:[email protected]]On Behalf Of\nTom Clark, K3IO\n  Sent: Wednesday, September 27, 2006 2:56 PM\n  To: Louis McFadin\n  Cc: AMSAT Eagle\n  Subject: [eagle] Re: Proposed Eagle Antenna Arrays\n\n\n  Louis McFadin wrote:\n    Unfortunately there is any way to put the antennas on the center of the\nspacecraft. There may be some spin modulation no matter what we do.\n\n\n    On Sep 27, 2006, at 1:41 PM, John B. Stephensen wrote:\n\n\n      The designer of the code to demodulate class 1 uplinks in the SDX\nneeds to determine whether spin modulation can be compensated for. The\ncarrier tracking loop bandwidth may be close enough to the satellite spin\nrate that it can't be eliminated. I'm not sure how well open loop\ncompensation would work as the phase pertubation will vary with the arrival\nangle of the signal and this could vary by as much as 30 degrees at MA32 and\nMA224.\n\n  Not quite true. For the phased arrays, if the required element phases are\ncomputed relative to the spin axis, then spin-induced Doppler is removed.\nYou will get the spin Doppler only if you set the phase reference to be the\ncenter of the patch array.\n\n  One way this can be done is for some LO  (common to all the elements of\nthe phased array) needs to phase modulated with a rate equal to the spin\nrate and with a magnitude/phase calculated on the basis of the s/c-to-earth\ngeometry. The only residual modulation to be compensated in the PLLs is then\ndetermined by the offset of the OBSERVER from the center of the earth.\n\n  Last nite I think I convinced Bob that the added S2 interferometric\nantennas (working against individual S2 array elements) will be able to\ndetermine the spin axis orientation (and rate) w.r.t. the line(s) connecting\nthe s/c to dedicated terrestrial beacon(s) with accuracies ~1º or better.\n\n  73, Tom\n\n\n",
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