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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/2MCZALERNJL5O26XHFGERIBHOG5O7I5B/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "2MCZALERNJL5O26XHFGERIBHOG5O7I5B",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/CQLRMYSI5KT2JB4XZ6HDLRIXS7JWQCFG/?format=api",
    "sender": {
        "address": "ve9qrp (a) gmail.com",
        "mailman_id": "4d6061838db34aba9a1c4722addebfaf",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/4d6061838db34aba9a1c4722addebfaf/emails/?format=api"
    },
    "sender_name": "Bruce Robertson",
    "subject": "[amsat-bb] Re: Stand alone real time tracker",
    "date": "2009-11-29T23:54:53Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/M6S67TR5TEKWVJBBDKX72LJ5AUMKTRJ5/?format=api",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "On Sun, Nov 29, 2009 at 6:23 PM, w4upd <[email protected]> wrote:\n> GO to the following FTP location at my site. I think you'll find what\n> you need there. If not let me know and I'll look to see if I have other\n> info related to the Trakbox.\n>\n>          ftp://bristor-assoc.com/pub/Amateur/TrakBox/\n>\n> Reid, W4UPD\n>\n>\n>\n> William Leijenaar wrote:\n>> Hi AMSATs,\n>>\n>> For some longer time I have been looking for a way to get a stand-alone real-time satellite tracking system, without the use of a dual-core, GHz speed power consuming computer :o) To my suprise I didn't found much, only one design called trakbox which can be found E.g at the following tapr website:\n>> http://www.tapr.org/kits_trakbox.html\n>>\n>> Unfortunatly it is not available anymore, and the mean reason I guess is the outdated components.\n>> I found out that the design originates from JAMSAT. Maybe someone has data (schematic, PCB layout, source code) of this design ?\n>>\n>> I wonder with todays highly integrated microcontrollers if there is some modern kind of real-time-tracker available ?\n>> I am looking for a system that works just seconds after switching on the power supply and not something that first has to boat 15min and needs a mouse to work.\n>>\n\nWilliam --\n\nIt depends what you mean by tracker, since the word is a bit widely\nused in English. It could mean 1) a device that, in response to az/el\nvalues submitted on a serial line, controls antenna rotors to track a\nsatellite, or 2) a device that calculates those az/el values (as well\nas downlink and uplink frequencies, e.g.), or 3) something that does\nboth of these tasks.\n\nThere are many commercial and one-off instances of #1. Trackbox above\nis an instance of #3, though I don't believe it is still being kitted.\nThe LVBtracker is best known as an instance of #1 above, but in fact\nthe latest version is an example of #3 above. It is available from\nAMSAT-UK as a kit, and from AMSAT-NA as a completed product.\n\nIf you'd like to explore an extremely low-power and small footprint\ndevice that will do #2 above, you might want to consider the\nqrpTracker libraries and applications I've written and ported for the\nArduino platform, available at http://code.google.com/p/qrptracker/\nwith a website at http://sites.google.com/site/qrptracker/ I think\nhobbiests might find this easy to work with because the various\nbuilding blocks -- like Plan 13 tracking code, TLE-storage and -access\nroutines and rig-control activies -- have been packaged into C++\nclasses. Moreover, the Arduino hardware is ubiquitous, standard and\nrelatively cheap.\n\nMy youtube video demoing how this code and hardware could be used\nonboard a satellite to save power made the rounds a couple of weeks\nago:\nhttp://www.youtube.com/watch?v=QSUK7Jq3LCY\n\nIn a day or so I hope to post a video of the same device\ndoppler-tuning my FT-817. The long-term terrestrial goal is to provide\na satellite-selecting and doppler tuning 'dongle' for this and the\nTH-D7A.\n\n73, Bruce\nhttp://ve9qrp.blogspot.com\n\n",
    "attachments": []
}