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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/IQGTFLTBCKEDSQI76OJPDUTHDAE24VWA/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "CAEpGj_PSW5cJqpo00z_t=p7qYFDBsr2YV7=MgqAiyj7mnhfzCA@mail.gmail.com",
    "message_id_hash": "IQGTFLTBCKEDSQI76OJPDUTHDAE24VWA",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/QK4JAWBEVOFZ7CL7QJOE5UMAP2JETLYA/",
    "sender": {
        "address": "pista01 (a) gmail.com",
        "mailman_id": "9713caf97dab455aab9b2b225b7f3a51",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/9713caf97dab455aab9b2b225b7f3a51/emails/"
    },
    "sender_name": "Steven Kalmar",
    "subject": "Re: [amsat-bb] Remote sensor for antenna array orientation",
    "date": "2016-02-21T18:42:02Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/QK4JAWBEVOFZ7CL7QJOE5UMAP2JETLYA/",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Clayton,\nI've been experimenting with 9-DOF boards for a custom AZ/EL rotator and\ncontroller build I'm doing.  DOF chips require filtering to reduce the\nnoise levels of the raw data and to calculate a heading.  Even with\nfiltering, the values tend to bounce around a lot, by more than a few\ndegrees.  They also need to be calibrated by moving them around.  Obviously\nthis is an issue when it's mounted to a rotator as you can't easily move it\naround when powering it up.  Some DOF libraries will allow calibration data\nto be saved and re-applied after restart.  The noisy data and processing\nrequired for the filters has been the main issues for me.\n\nI just received this one from Adafruit -\nhttps://www.adafruit.com/products/2472\n\nIt has an onboard processor that filters the raw data and returns absolute\nposition in degrees, with no math on the Arduino and no bouncy readings.\nOnce the board is calibrated and the calibration setting saved, it's just a\nmatter of loading the saved calibrations when the board powers up.\n\nI haven't had this board long enough to determine how well it will work\nlong term, but so far I've been impressed with it's noiseless and\nconsistent readings over many restarts.  It even returns a consistent\ncompass heading when it's pointing north and it's rotated 90 degrees along\nthe E/W axis..  The previous board I tried didn't do so well for compass\nreadings when the board wasn't flat.  My plan is to use this to calculate\ncompass and elevation from it's boom mounted position for initial rotator\nzeroing and as a secondary sensor for sanity checking AZ/EL positions.\n\n\nSteve\nKD8QWT\n\nOn Thu, Feb 18, 2016 at 1:58 PM, Clayton W5PFG <[email protected]> wrote:\n\n> Has anyone ever mounted a mutli-axis accelerometer or a magnetic compass\n> sensor to their antenna crossboom for making adjustments to point of aim?\n>\n> I'm currently using Hall Effect sensors but experiencing several degrees\n> of drift over a short period of a few days.\n>\n> 73\n> Clayton\n> W5PFG\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\n\n\n-- \n\"In a time of universal deceit, telling the truth becomes an act of\nrebellion.\"\n--George Orwell\n",
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}