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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/2KQZR7UQZFUUZIF22LRNVIBU2BVHBKNV/?format=api",
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    "message_id": "CALNQy48F=smZnhRZgx5q=qZA_cAx2hcBJchaqD2Fw7x4Q9inyg@mail.gmail.com",
    "message_id_hash": "2KQZR7UQZFUUZIF22LRNVIBU2BVHBKNV",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/RUIVHYKOE6NAUCAHEBFHHYE2U5LCGEJV/?format=api",
    "sender": {
        "address": "ewpereira (a) gmail.com",
        "mailman_id": "bf62ce620f5344f48e77dcfeab534e6d",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/bf62ce620f5344f48e77dcfeab534e6d/emails/?format=api"
    },
    "sender_name": "Edson W. R. Pereira",
    "subject": "Re: [amsat-bb] ISS ping box (now PBBS)",
    "date": "2016-09-23T16:52:48Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/3AYV3DTRZTIOVC54XZWV3QAHOHLYXNS4/?format=api",
    "children": [
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/DUKZRQX7OF4PL3UEBSSUUDPYU5ARDG3D/?format=api"
    ],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Hi Dani,\n\nI have been following with great interest the commissioning of BEESAT and\nam looking forward to experiment with the digipeater onboard. Daniel,\nEA4GPZ, has implemented a very nice modem for BEESAT in gnuradio (\nhttps://github.com/daniestevez/gr-satellites). I have tested it with some\naudio samples recorded by Jan, PE0SAT. It works very well.\n\nIt would be very nice if a similar type of experiment could replace the\nancient AX.25 digipeater onboard the ISS.\n\n73, Edson PY2SDR\n\n\n---\n- We humans have the capability to do amazing things if we work together.\n- Nós seres humanos temos a capacidade de fazer coisas incríveis se\ntrabalharmos juntos.\n\nOn Fri, Sep 23, 2016 at 10:59 AM, Dani EA4GPZ <[email protected]> wrote:\n\n> El 23/09/16 a las 14:22, Edson W. R. Pereira escribió:\n> > What would be required (from the point of view of paper work, logistics,\n> > approvals, etc.) to replace the current ISS packet radio TNC by a device\n> > that would implement some more efficient digital communications? The\n> device\n> > could be a digipeater, but employing strong FEC and a more modern\n> > modulation and framing structure and perhaps some better scheme for\n> channel\n> > access. Perhaps something similar to ngham.\n> >\n> > https://github.com/skagmo/ngham\n> >\n> > With FEC and higher speed, we could accommodate many more users on a\n> single\n> > pass. A dedicated software application on the ground would implement the\n> > modem and process information -- separating different types of messages\n> in\n> > different screens, providing a chat like mode for real-time\n> communications,\n> > automatically forwarding APRS packets, etc.\n> >\n> > Am I day dreaming?\n>\n> Hi Edson,\n>\n> You're not daydreaming that much. The BEESAT satellites have a\n> digipeater using the Mobitex-NX protocol, which has some form of FEC.\n>\n> Many other satellites on the Amateur bands transmit telemetry using\n> strong FEC. For instance, AAUSAT-4 uses an r=1/2, k=7 convolutional code\n> and (255,223) Reed-Solomon with CCSDS scrambling.\n>\n> Support and experimentation for these and many other protocols is very\n> easy today using SDR.\n>\n> 73,\n>\n> Dani.\n>\n> _______________________________________________\n> Sent via [email protected]. AMSAT-NA makes this open forum available\n> to all interested persons worldwide without requiring membership. Opinions\n> expressed\n> are solely those of the author, and do not reflect the official views of\n> AMSAT-NA.\n> Not an AMSAT-NA member? Join now to support the amateur satellite program!\n> Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb\n>\n",
    "attachments": []
}