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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/TVM2SWYWL5424V7A3J5YAHCV4OMDINML/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "TVM2SWYWL5424V7A3J5YAHCV4OMDINML",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/5HCWDGY7NTFKXMOTF2O7KEJMGKDL6VW4/?format=api",
    "sender": {
        "address": "tom (a) n4zpt.org",
        "mailman_id": "cced7986452f47d1903a63efb3f9c241",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/cced7986452f47d1903a63efb3f9c241/emails/?format=api"
    },
    "sender_name": "Tom Azlin N4ZPT",
    "subject": "[amsat-bb] Re: Decoding wideband recordings",
    "date": "2011-08-18T01:20:32Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/VUPTZG2MDAES3LQO33HNDDLZE2TH3P53/?format=api",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Thanks Bruce.\n\nI think I need to go get a preamp and filter!  And try again.\n\n73, tom n4zpt\n\nOn 8/14/2011 12:06 PM, Bruce Robertson wrote:\n> On Sat, Aug 13, 2011 at 7:07 PM, Phil Karn<[email protected]>  wrote:\n>> On 8/10/11 8:24 PM, Tom Azlin N4ZPT wrote:\n>>> I have a Fun Cube Dongle so I would Phil. Thanks and 73, Tom n4zpt\n>>\n>> Okay, everybody make and keep your wideband I/Q recordings and I'll work\n>> on an enhancement to my demodulation/decoding software to process them.\n>> It may not run in real time on slower machines because of the need to\n>> search a wider frequency range, but this won't matter if it can work on\n>> a recording.\n>>\n>> I can probably speed things up by including an orbit model in the modem\n>> to predict Doppler open-loop, but this will take time to implement and\n>> it will still be vulnerable to small errors in the elements and/or your\n>> clock, especially around closest approach. So record the date and time\n>> of your recordings and the current eleset at that time.\n>\n>\n> For those who have not noted this feature, HDSDR will open a recording\n> scheduler if you right click on the 'record' button. It saves files\n> with UTC time appended. The tricky part is that you have to set the\n> scheduler manually in local time.\n>\n> I've been thinking it would be a nifty hack to make a FCD recorder for\n> a set of satellites using a very small computer, like the BeagleBoard.\n> It seems to me that a daily cron job with 'Predict' would just about\n> do what was necessary, especially now that we have a commandline tool\n> for the FCD. The only part that would take some fiddling would be\n> piping the USB sound card into a file with the proper headers for\n> HDSDR.\n>\n> 73, Bruce VE9QRP\n>\n>\n\n",
    "attachments": []
}