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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/FFXVLMP63JPORDSIONN6OTNR6EDYXE6M/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "FFXVLMP63JPORDSIONN6OTNR6EDYXE6M",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/FFXVLMP63JPORDSIONN6OTNR6EDYXE6M/?format=api",
    "sender": {
        "address": "kf6kyi (a) gmail.com",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "Mark Vandewettering",
    "subject": "[amsat-bb] Re: thought for a neat product, anyone seen one?",
    "date": "2008-11-24T23:25:26Z",
    "parent": null,
    "children": [
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/JCLAT5OUHTERVELNIOO6VGIRANN7M6X4/?format=api"
    ],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "\nI have the same rig, and much the same idea.  I haven't gotten very  \nfar along with this idea, but\nhere's where my thinking takes me.  I've implemented Miller's \"Plan  \n13\" algorithm in Python, and\ncurrently use it to plan all my satellite operations.  On any  \nreasonable laptop, it runs many times\nfaster than real time, even while running in Python, so it seems like  \noverkill to carry a laptop\nwith you to do satellite operations.  The laptop is expensive, bulky,  \nand hard to use in the field\nwhile aiming an antenna by hand, has limited battery life, etc.    \nClearly, a more limited computer\ncan do all that we really need.     If you look at G6LVB's latest/ \ngreatest antenna tracker:\n\nhttp://www.g6lvb.com/Articles/LVBTracker2/index.htm\n\nyou can see that he does all that you want using just a PIC  \nmicrocontroller.   My own personal\nbias is against the PIC though: I prefer the Atmel AVR chips, and in  \nparticular have been having\na great deal of fun with the Arduino microcontroller board.  I suspect  \nthat if I back ported my\nPython code into C and put it on the Arduino, I could still get an  \nupdate rate approaching 1Hz,\nwhich should be good enough for the purposes we desire.   The Arduino  \nalso has a nice little\npiggyback ethernet board.   Here's what I imagine the usage is.  While  \nat home, you plug this\nthing into your home network.  It then contacts celestrak or whatever,  \nand automatically downloads\nthe TLE for current amateur satellites.  You can then disconnect the  \nrig from your home network, and\nit's ready to carry into the field.  A couple of buttons on the box  \nallow you to cycle through\nsatellites, giving the elevation and azimuth of the satellite.  The  \nArduino also has a serial port\nwhich we can hook to the FT-817, and use it to control the 817 with  \ndoppler.  It would be a pretty\nsimple project, requiring three modules (arduino, ethernet shield and  \ndisplay) and a few extra\nbuttons etc...   Total cost probably around $100 or so.  Could  \nprobably run off batteries for days.\n\nI probably won't get back to working on this until after the first of  \nthe year, but if anyone\nis interested, some enthusiasm might further motivate me to get the  \nsoftware working.\n\n\tMark\n\n",
    "attachments": []
}