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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/PKFXDNMIFC53E33YZ53QYUOFJ3O4UT7B/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "PKFXDNMIFC53E33YZ53QYUOFJ3O4UT7B",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/PKFXDNMIFC53E33YZ53QYUOFJ3O4UT7B/?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]  Introducing qrpTracker, a $4 microwatt satellite tracker",
    "date": "2009-10-25T01:13:40Z",
    "parent": null,
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Over the last couple of months I've ported the Plan13 satellite\ntracking algorithm to a library for the Arduino platform. To inspire\nArduino hobbyists and fellow amsaters, I've made a website to explain\nand explore this material, http://sites.google.com/site/qrptracker/\nThere you'll find a 4 min. introductory video. Around 1:33, the\nArduino demo starts.\n\nThough I was originally thinking of making a sort of doppler tuning\ndongle for my FT-817 -- a sort of LVBTracker for the trail -- along\nthe way I've become aware that there are many uses of a $4 device that\ncan track 13 tles all alone, and leave about 14kB for other\nprogramming, all with the possibility of average power use in the tens\nor hundreds of microwatts and SMD dimensions of 8mm^2.\n\nFor instance, equipped with a low-power tracker like this, an amateur\nsatellite could track its own location over the earth by means of a\nreliable real time clock, and it could change its mode depending on\nits calculated location, say turning off its beacon over the poles and\noceans. (Plan13 *in* outer space!)\n\nI've implemented this idea in the demo\nhttp://code.google.com/p/qrptracker/source/browse/trunk/modeSwitcher_powersave.pde\nRegions of earth, defined with latitude and longitude limits, are\nstored as an array, and when  Plan13  finds the satellite is within\none of these regions, it raises one of its pins to a 'high' state,\notherwise, this pin is 'low'. When not calculating position, the\nAtMega328 can drop into a low-power sleep, consuming around 20\nmicroWatts, but retaining the state of its signaling pin. The\nsatellite uses the state of the pin to turn off its beacon, or to\nswitch from a linear to an FM mode. I plan to illustrate this in a\nfuture screencast.\n\nOf course, the same idea could be implemented in a multitasking IHU of\nany platform. qrpTracker is offered as a simple means by which people\ncan play around with satellite tracking in microcontrollers, and I\nwelcome collaborators and bug reports at its open-source code\nrepository at http://code.google.com/p/qrptracker/\n\nFinally, if anyone has use of a chip that spits out AZ/EL and doppler\ninfo, either through serial-line requests or off of the I2C bus, I'd\nbe happy to send off a chip loaded with the keps you need. Your\napplication would have to supply the real time clock, and eventually\nthe loaded keps would get stale, but by that time you'll be hooked and\nhave the equipment to update the keps yourself :-)\n\n73, Bruce\nVE9QRP\n",
    "attachments": []
}