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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/73YVWGJTQMYGUKO5RXHOAMTFL3KLOCLG/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "73YVWGJTQMYGUKO5RXHOAMTFL3KLOCLG",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/5HCWDGY7NTFKXMOTF2O7KEJMGKDL6VW4/?format=api",
    "sender": {
        "address": "g7iii (a) g7iii.net",
        "mailman_id": "0f637f75ff6f40f5888fc0c2c82dc515",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/0f637f75ff6f40f5888fc0c2c82dc515/emails/?format=api"
    },
    "sender_name": "Iain Young, G7III",
    "subject": "[amsat-bb] Re: Decoding wideband recordings",
    "date": "2011-08-10T16:20:13Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/5HCWDGY7NTFKXMOTF2O7KEJMGKDL6VW4/?format=api",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "\n\nOn 09/08/11 23:54, Phil Karn wrote:\n\n> It's been suggested that I modify my ARISSat-1 BPSK-1000 telemetry\n> demodulator/decoder to accept wideband quadrature (I & Q) recordings\n> like those produced by most of the software defined radios out there.\n> \n> This is fundamentally not that hard, but first I need some information.\n> \n> How many people could actually use this? What is the format of the\n> recorded files? Is there a standard, or does each make of SDR produce\n> its own?\n\nI'd use it. In fact I drive my Funcube Dongle with gnuradio. It would\nmean I could simplify my flow graphs, and not have to stick have the\naudio out to a loopback ALSA soundcard, and then into your decoder.\n\n(I could then squirt the I/Q stream to a FIFO, and pump that to your\ndecoder, and save all the blocks needed to do the SSB stuff, and\ndropping it down to audio)\n\nIn fact, IIRC, its not that hard in gnuradio to do BPSK decoding anyway,\nit's just no-one's actually done it. You have to just unhook the\ndifferential part of the decoder AIUI. Easy in python, but not possible\nso much in the in the gnuradio-companion, which I use to construct the\nflow graphs graphically\n\n\n73s\n\nIain\n\n",
    "attachments": []
}