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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/KSAMMCUF6LGN6RAZTOPFHNNGMDOS2M64/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "CAJCSnOZwarxcu9_VM32oX-WJBcR90-GtUqB7T5Ai2aanebS=cQ@mail.gmail.com",
    "message_id_hash": "KSAMMCUF6LGN6RAZTOPFHNNGMDOS2M64",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/KSAMMCUF6LGN6RAZTOPFHNNGMDOS2M64/",
    "sender": {
        "address": "scott23192 (a) gmail.com",
        "mailman_id": "120e10e05ba14969a11da0a96d21e355",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/120e10e05ba14969a11da0a96d21e355/emails/"
    },
    "sender_name": "Scott",
    "subject": "[amsat-bb] Taurus-1 FM/Codec2 Voice Repeater Active",
    "date": "2019-09-17T17:55:24Z",
    "parent": null,
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "The FM / Codec2 voice repeater on Taurus-1 went \"live\" today (17-Sept-2019)\nwith 2 passes available to stations on the U.S. East Coast.\n\nW2RTV posted a video of the entire pass as seen from his station at\nhttps://www.youtube.com/watch?v=ge9mSscTZYg\n\nThe spacecraft is clearly spinning at a high rate; my receive audio wasn't\nnearly as good as Rocco's, but he's got a vastly superior antenna setup, so\nthat never hurts.\n\nThe repeater's uplink is normal FM on 145.820 MHz w/ a 67 Hz CTCSS tone.\nHigh power is definitely not needed but adjusting for uplink doppler can\nhelp extend your range.\n\nThe downlink is a Codec2 digital stream at 9600 BPSK which you receive as\nUSB on 435.840 MHz.  That gets you in the ballpark, anyway.  Once downlink\npackets are observed, center your 15k-wide USB window on the packets and\ndoppler track from there.\n\nThe digital voice stream (as well as telemetry) decodes with a flowgraph in\nGNU Radio.  The original telemetry decoder for Taurus-1 was produced by\nEA4GPZ and is located at https://github.com/daniestevez/gr-satellites\n\nSeveral of us have added to Dani's flowgraph to provide audio output now\nthat the repeater is active.  That hybrid flowgraph can be found at:\nhttps://www.qsl.net/k/k4kdr//grc/taurus1-k4kdr-telem+audio-v1.grc\n\nNote that both the original decoder from Dani as well as the hybrid\nvoice/telemetry flowgraph expect UDP audio input such as from GQRX.\n\nHere is a Tweet I posted after my first contact on the repeater today with\na screen shot which pretty clearly shows how the spacecraft is spinning:\nhttps://twitter.com/scott23192/status/1174001658419994624\n\nThis repeater seems to work extremely well and should be way better if the\nspin rate reduces over time.  Hope to hear more people on!\n\n-Scott,  K4KDR\n",
    "attachments": []
}