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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/T35L3JCTCJB6BXO7WUPB7WBZDAQ77IZU/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "T35L3JCTCJB6BXO7WUPB7WBZDAQ77IZU",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/M75N3NPZDIMMIQVFYEWL46KUQJ57LSBZ/?format=api",
    "sender": {
        "address": "zleffke (a) vt.edu",
        "mailman_id": "57a24afb1cf641f98121841e6753c12e",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/57a24afb1cf641f98121841e6753c12e/emails/?format=api"
    },
    "sender_name": "Zach Leffke",
    "subject": "Re: [amsat-bb] FUNCube-1 (AO-73) Telemetry via FO-29??",
    "date": "2016-08-12T15:29:32Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/6ZAOPG7YHDINK7RBKR4IKK7T4HTYQAVZ/?format=api",
    "children": [
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/7W5WYSGXK6JCINRYEM4RODXEWRTLPWG7/?format=api"
    ],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Hi Dani,\n\n     Great questions.  On my long list of 'TO DOs' for the VTGS is to \nget our github account up and running to push our satellite GNU Radio \nwork back out to the Open Source community.  Once we do I'll post the \ncode along with the pyBOMBS recipes for installation.  I don't have an \nETA for that though (maybe this Fall semester.....?).  There are a few \nother things in the Out of Tree Module that would be of use to Hams as \nwell.  For example we have scramblers and descramblers that are AX.25 \ncompliant.  We also have an AFSK TRANSMITTER as well as an AFSK receiver \n(I've seen a few AFSK/AX.25 GNU Radio projects, but they are all \nreceivers and they don't separate the demodulator from the link layer \nprotocol).  Fair warning if I ever do get the code posted and you play \nwith it, the output of the modem is the raw 256 byte packet (after FEC \ndecode and CRC check, that I send to a PDU socket). There is no pretty \ndashboard in our code.  The intent was to develop a separate dashboard \nfor AO-73 that would connect to the GNU-Radio modem over the socket (we \noperate our ground station remotely from a mini Mission Control at \nSpace@VT).  That is also on the long list of to dos.\n\nI've never compared our receiver to the funcube dashboard side-by-side \nin a real detailed way.  That is definitely something I would be \ninterested in seeing the results of.  I do use a funcube dongle with the \ndashboard for student demos with an arrow antenna.  I would say \ncomparing my 'impressions' of both is that they both work very well and \nbasically just after AO-73 pops over the horizon we get solid decodes on \nboth (FEC is great!).  My gut is that with all of the great folks at \nAMSAT-UK and all of the good engineering effort they put into that \nsoftware, that theirs probably performs a bit better.  We make up for \nour probably higher implementation loss by have a pair of 14 element \ncrossed yagis (2 M2 antennas 2MCP14s combined in phase), so lots of \ngain. The AO-73 dashboard also does the Automatic Frequency Correction, \nwhich is something we don't quite have implemented in our GNU Radio \nflowgraphs yet (we tune either manually or via a Gpredict interface to \nGNU-Radio to get inside the capture bandwidth of our differential bpsk \ndemod).\n\nSomething that would make a good comparison easier to implement, and \nthat I would like to see, is a Linux version (and open source) of the \nFunCube Dashboard.  I don't really want to mess around with Windows \nemulators on our Linux servers/workstations in the VTGS. That could be a \nfun student project to try to integrate a Linux version of the Dashboard \nwith the Socket interface to GNU Radio (and would allow us to forward \nthe tlm packets to the data warehouse easier).  That's one of the things \nI really like about the AO-85 dashboard is the cross-platform support.\n\nGood questions, thanks for the interest.  I'll try to put more effort \ninto elevating the github thing on the to do list this semester.\n\n-Zach, KJ4QLP\n\nResearch Associate\nTed & Karyn Hume Center for National Security & Technology\nVirginia Polytechnic Institute & State University\nWork Phone: 540-231-4174\nCell Phone: 540-808-6305\n\nOn 8/12/2016 10:55 AM, Daniel Estévez wrote:\n> El 12/08/16 a las 16:48, Zach Leffke escribió:\n>\n>> For our\n>> GNU-Radio modem, we need about 7 dB SNR (including implementation loss\n>> there) for solid demodulation.\n> Hi Zach,\n>\n> Is this GNU-radio AO-73 receiver available online? It would be\n> interesting to take a look at. How does it compare (in terms of SNR\n> performance) to the dashboard software?\n>\n> 73,\n>\n> Dani EA4GPZ.\n>\n>\n>\n> _______________________________________________\n> Sent via [email protected]. AMSAT-NA makes this open forum available\n> to all interested persons worldwide without requiring membership. Opinions expressed\n> are solely those of the author, and do not reflect the official views of 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": []
}