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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/U6CCJPYFC7M43FN2QUCV3ZVNYSCNNFWQ/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "[email protected]",
    "message_id_hash": "U6CCJPYFC7M43FN2QUCV3ZVNYSCNNFWQ",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/U6CCJPYFC7M43FN2QUCV3ZVNYSCNNFWQ/",
    "sender": {
        "address": "n6rfm1 (a) gmail.com",
        "mailman_id": "54ef064bb1ce4fdeb6fa2c7ec7856be8",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/54ef064bb1ce4fdeb6fa2c7ec7856be8/emails/"
    },
    "sender_name": "N6RFM1 gmail",
    "subject": "[amsat-bb] : Re: BY70-1 not heard",
    "date": "2017-01-08T21:00:50Z",
    "parent": null,
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Hi Paul and AMSAT friends,\n\nIt's really great to hear BY70-1 getting lots of use.  Lots of familiar\ncalls and some new ones.  Perfect.\n\nIndeed, Scott K4KDR and I have recently made several coordinated attempts to\ncollect BY70-1 telemetry and camera pictures.   This would not have been\neven possible without the support of Mingchuan BG2BHC (as a project team\nrepresentative, for GNU radio support and example wav format command files),\nDani EA4GPZ (for authoring open source GNU radio blocks, and hosting a\nfantastic blog which describes how much of this works), and the BY70-1\nproject team. \n\nWe have made several attempts over the past few days during favorable passes\nfor us.  So far, we have received some good telemetry, been able to command\nthe satellite to take a picture and then download a few pieces of the JPG.\nUnfortunately, so far we have only fragments of JPG data.  If more than a\nfew packets in the JPG file data stream are lost, the JPG image cannot be\nreconstructed.   For reasons we do not understand, either the downlink data\nstream stops, is disrupted or BY70-1 resets.  It may even be our ground\nstation hardware limitations.  We don't quite know.  We do hope however that\nsome of our experiences will guide future developments.   For example, as\nDani suggests SSDV which has error detection and correction capability.\n\nFor those interested and key point, BY70-1 will only accept a camera command\nafter 30 seconds of transponder non-use.  Given the popularity of BY70-1,\nwhich is great and what we all want, Scott and I have had a few chances to\nsend camera commands during such \"quiet times\" or > 30 periods on non-use.\nBut again, we are delighted BY70-1 is popular and being used. \n\nWhat you may have heard was the satellite re-transmitting  my request to\n\"take and send\" a picture.  These uplink commands are in FM and last a few\nseconds.  If successful,  the satellite switches modes and starts picture\ntransmissions in SSB mode on the downlink.  These last for ~10 - 15 seconds.\nThen we hear the transponder come right back on.  You might not even notice\nbetween sips of coffee (or whatever!)\n\nOnce a related camera mode has been activated, there is a 10 minute\ncountdown before another such request will be accepted.  As a practical\nmatter, with the 10 minute camera watchdog, those interested in getting a\npicture really have one shot/pass and only if the transponder is quiet for\nthe >30 second period.\n\nIt's really great to hear everyone using BY70-1.  That's what it's all\nabout.  And thanks to Scott K4KDR for being a great partner on this little\nproject!\n\nOf course, I've made few Qs myself!  I must say the audio quality is amazing\nto my ears.   One last thing Paul.  I need to work you on BY70-1!  :-)\n\n73,\n\nBob\n\n\n\n",
    "attachments": []
}