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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/VCDTMBIXHRBZ2VBNHJORBFZIX3HQFHWY/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "[email protected]",
    "message_id_hash": "VCDTMBIXHRBZ2VBNHJORBFZIX3HQFHWY",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/VCDTMBIXHRBZ2VBNHJORBFZIX3HQFHWY/",
    "sender": {
        "address": "K3IO (a) verizon.net",
        "mailman_id": "79a9b3ddaa4b44baae47f92374974ac4",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/79a9b3ddaa4b44baae47f92374974ac4/emails/"
    },
    "sender_name": "Tom Clark, K3IO",
    "subject": "[amsat-bb] Re: WAS Re: AO-16 report from Copenhagen",
    "date": "2008-01-24T06:14:24Z",
    "parent": null,
    "children": [
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/SYJJLNRMIDUCNBX4TCLJRLA4VGMARMAF/"
    ],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Mark, N8MH noted:\n \n> The 437.024 transmitter antenna configuration on AO-16 is Left Hand Circular \n> polarity (LHCP).   The receiving antenna on the bird is a 1/4 wave vertical \n> whip.\n>   \nThis whip operates against the body of the spacecraft as a \"ground \nplane\"; however the spacecraft body is a cube 22 cm on a side (you can \nsee a picture at \nhttp://128.54.16.15/amsat-new/satellites/satInfo.php?satID=11&retURL=/satellites/status.php \n<http://128.54.16.15/amsat-new/satellites/satInfo.php?satID=11&retURL=/satellites/status.php>). \nThis is about half of the quarter-wavelength you'd like to see for a \nproper ground reference, so the actual pattern undoubtedly has some \nweird nulls.\n> The fading is quite dramatic, which means the bird is spinning/tumbling, or \n> some combination.  We could never hear this before on AO-16 when it was \n> transmitting its normal PSK signal, since we didn't hear the effect of fading \n> on the uplink in this mode.  Now we hear it, loud and clear!\n>\n> It does take an uplink signal that is pretty close to on frequency (145.820).  \n> Adjusting for Doppler is helpful thing on the uplink.\n>   \nThe receiver has a 15 kHz wide crystal filter with sharp skirts. So if \nyour NBFM xmtr is set with a ±5 kHz deviation, you may well find your \nsignal hitting the filter \"walls\". You may get better performance if you \ncrank the deviation back a bit.\n\n73, Tom\n\n",
    "attachments": []
}