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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/TKQSHWHX4J55QOWBRYTPTWSV65UAN6E7/?format=api",
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    "message_id": "001d01c6d697$0f7f13f0$6432a8c0@notepad8",
    "message_id_hash": "TKQSHWHX4J55QOWBRYTPTWSV65UAN6E7",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/V5WDPF4VXTYGDUDOYX2LQ5FBM5AK6ONM/?format=api",
    "sender": {
        "address": "howard (a) howardlong.com",
        "mailman_id": "82a1d3d58c6f48898b755d208f81930e",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/82a1d3d58c6f48898b755d208f81930e/emails/?format=api"
    },
    "sender_name": "Howard Long",
    "subject": "[amsat-bb] Re: SDX transponder timing delay measurements?",
    "date": "2006-09-12T18:12:51Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/KGXJVGCYH2VYJINMZUUBORH3PURYGJRX/?format=api",
    "children": [
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/DLW36NRSXWIEZ5QZUABHELDL2DOSXHSM/?format=api"
    ],
    "votes": {
        "likes": 0,
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    "content": "Hi Ken\n\n> As a design goal, it would be helpful to the \n> OD process if the delay could be made consistent \n> within about +/-5 micro-sec -- i.e., 1500 meters \n> (smaller is better).  It is also important to\n> quantify the standard deviation to that bias is \n> since that is also factored into the OD process.\n\nI may be wrong, but I can't think of a reason why it wouldn't be well under\nthis figure. I was thinking more in terms of 100's if not 10's of\nnanoseconds.\n\nThe SDX (a) takes a batch of samples, (b) does its processing, then (c)\noutputs the processed batch of samples.\n\nEach of the three parts takes the same amount of time and all three are\nexecuted in parallel like a production line using DMA for (a) and (c), and\nthe DSP CPU for (b). This time is dictated by the CPU's crystal oscillator.\n\nI am guessing any variation would be predominantly from the analog circuitry\n(R's and C's changing value with temperature?), but Bob may have other\nsuggestions I hadn't thought of.\n\n73, Howard G6LVB\n\n\n",
    "attachments": []
}