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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/M6NFBNYVLHCTEXMK4AXCZ7DF6M2LMENG/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "CAGtDtzx_+70ZoGr3P2tLwnoK0tYeK1MJ7YnROB0PzNq_SLX4eg@mail.gmail.com",
    "message_id_hash": "M6NFBNYVLHCTEXMK4AXCZ7DF6M2LMENG",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/M6NFBNYVLHCTEXMK4AXCZ7DF6M2LMENG/",
    "sender": {
        "address": "ejcspii (a) gmail.com",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "Peter Horvath",
    "subject": "Re: [amsat-bb] ANS-353 AMSAT News Service Special Bulletin - SMOG-P and ATL-1 Designated Magyar-OSCAR 105 (MO-105) and Magyar- OSCAR 106 (MO-106)",
    "date": "2019-12-22T16:34:39Z",
    "parent": null,
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Hello,\n\non this happy occasion I'd like to add some more info about MO-105 and\nMO-106, hoping that more people will be tune in and listen to the telemetry\nreceived from the satellites.\n\nSMOG-P (MO-105) is a 1p PocketQube (5x5x5 cm, 250 grams), a fully redundant\ntiny satellite with an actual scientific payload: a flying spectrum\nanalyzer. It measures the scattered RF energy over the UHF band\n(specifically, in the digital terrestrial TV band) that can be detected in\nspace.\nATL-1 (MO-106) is a larger 2p PocketQube featuring the same spectrum\nanalyzer experiment.\n\nBoth satellites transmit almost identical telemetry data. In addition to\nbasic CW telemetry carrying callsign, battery voltage and temperature,\nthere is a digital telemetry with variable data rate and coding scheme.\nMost frequently, modulation is 1250 or 5000 bps GMSK. The data is encoded\neither by the well-known \"AO-40\" FEC, or a shorter, proprietary variant of\nit, but they can also use a more powerful, state-of-art repeat-accumulate\n(RA) coding scheme.\n\nSome practical information about receiving the telemetry:\nA GUI telemetry receiver is available for Windows and Linux (soon for OS X\nas well), and a command line receiver can also be used (Linux only). Both\ncan be downloaded from\nhttps://gnd.bme.hu:8080/index\nThe programs are able to submit the received packets to the central\ntelemetry data base. This requires a quick registration, the login\ncredentials can be used with either of the decoders. There are some issues\nwith the GUI software that hopefully will be resolved within a few days.\nThese decoders assume either a USB receiver connected through the sound\ncard or an rtl-sdr receiver.\nThanks to Daniel Estevez, EA4GPZ, a high quality, full decoder and packet\nuploader is also available for GNU Radio 3.8 within the out-of-tree module\ngr-satellites. For uploading to the received packets, it uses the same\nlogin as the \"official\" programs do:\nhttps://github.com/daniestevez/gr-satellites/tree/maint-3.8\nThis decoder can unleash the full potential of the RA FEC. You'll need to\nput an FM demodulator in front of the flowgraph.\nI'd be glad to see many submissions on the \"Leaderboard\" from around\nthe world:\nhttps://gnd.bme.hu:8080/leaderboard\nHaving many receiving stations around the globe could greatly improve the\nglobal picture the spectrum analyzer payload can offer.\n73\nPeter\nHA5CQA/AK4RP\n",
    "attachments": []
}