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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/CC6OQSC6P6VLHM5DSTG3ZL42OM27IEYQ/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "CAJEM474e4s3b_kS6hNWt_ya5=Ysz3XhVh=9MUDkXfaTnNhOcUA@mail.gmail.com",
    "message_id_hash": "CC6OQSC6P6VLHM5DSTG3ZL42OM27IEYQ",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/FPQ3IOK7YULKQEKW67HZNRPRRJI64S2V/",
    "sender": {
        "address": "samudra.haque (a) gmail.com",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "Samudra Haque",
    "subject": "[amsat-bb] Re: inquiry about homebrew az-el systems",
    "date": "2013-02-25T01:45:23Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/NW53CE4FTP3WRU4B5EEKPCK5Z77WD45S/",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "I think these old articles are really informative. I had collected them\nearlier, and re-read them just now. BTW Does anyone have any pointers to\nphase array design tools for satellite antennas as a potential substitute\nfor multi-element yagi ?\n\n73 de X\n\n\n\n\nOn Sat, Feb 23, 2013 at 11:03 PM, Samudra Haque <[email protected]>wrote:\n\n> hi, thanks for addressing this question. And I invite others to\n> participate, or get in touch with me for a phone conversation, and discuss\n> simple steps that can be taken IMHO within 50-100 USD. I suggest we adopt\n> AMSAT friendly tips:\n>\n> http://www.amsat.org/amsat-new/tools/downloads/iROTOR.pdf (will need\n> additional interface to PC, any kind)\n>\n> (cool idea, but only as concept)\n> http://www.amsat.org/amsat-new/echo/Az_El_Pos.pdf\n>\n> http://dgg.gotdns.com/doc/XOX_rotor.pdf (Semi professional..)\n>\n> http://ka6puw.tripod.com/azimuth1.html <--- what do you think of this\n> style? Looks simple enough.\n>\n> But I have only done a simple google search here. Any other projects worth\n> investigating? Focus on the \"mount\" only now.\n>\n> -samudra\n>\n>\n>\n>\n>\n>\n> On Sat, Feb 23, 2013 at 10:41 PM, Lizeth Norman <[email protected]>wrote:\n>\n>> Samudra,\n>> This is a good question for a first year engineering student like\n>> myself: How does one bring home the best bang for the buck out of an\n>> engineering dollar?\n>>\n>> Feel free to ask around. A few on the list have driven unusual devices\n>> to get antennas moved.\n>>\n>> How does a project get into the hands of people who will actually do\n>> it? A one off I can do for you in my basement. Probably with parts\n>> from radio shack, a grinder and a few hand tools.. A reproducible\n>> project 10 years from now? Hardly likely.\n>>\n>> I submit to you that irrespective of the metalwork this is a simple\n>> project as you propose, however it must be reproducible. With a\n>> student copy of SolidWorks, a circular saw, drill and the Arduino IDE\n>> it could be prototyped by two people in a weekend. Refining it so that\n>> a relatively new ham with a smidgin of technical ability could do it\n>> might take a little longer. These days with the internet and cad, the\n>> real issue is the tooling. How do you design/layout such that it can\n>> be done with snips/file/saw/fill in the blunt instrument here..\n>> 73 es have fun..\n>>\n>> Norm n3ykf\n>>\n>>\n>>\n>>\n>>\n>> On Sat, Feb 23, 2013 at 10:19 PM, Samudra Haque <[email protected]>\n>> wrote:\n>> > I hope it is evident, I am not focusing on the\n>> > controller/microcontroller/computer interface/az-el controller/etc. The\n>> real\n>> > issue is how cheaply can an antenna be mounted on a kingpost somewhere\n>> on a\n>> > surface, with a view towards the sky, and how conveniently can that\n>> mount be\n>> > motorized, with a sensor to give feedback to the ground station.\n>> > electronics, seem to be, (apologises to EE friends) a dime a dozen,\n>> cheaper\n>> > if made in hundreds, but the key drawback of any design is the\n>> mechanical\n>> > and electromechanical (can we use, mechatronics) system that serves as\n>> the\n>> > actuators. I am not referring to a hand held antenna assembly, but\n>> rather\n>> > something that we can all use in cold/hot weather and that can be put\n>> > together by one / two persons on an average post.\n>> >\n>> > Comments welcome, I think the future holds bright for amsats and edu\n>> based\n>> > cubesats.\n>> >\n>> >\n>> > -samudra\n>> >\n>> >\n>> > On Sat, Feb 23, 2013 at 9:50 PM, Lizeth Norman <[email protected]>\n>> > wrote:\n>> >>\n>> >> Gus and the group:\n>> >> Lots of birds going up in the next year. Success rate not 100% as it's\n>> >> rocket science oftentimes on a budget. Hopefully we'll get a few out\n>> >> of it.\n>> >> The Arduino IDE install supports PPM. The nice thing about that\n>> >> platform is that configuration is doable for just about all forms of\n>> >> hardware that you might drive with it and scaling can be done in\n>> >> software for the various different bits of kit.\n>> >>\n>> >> I am sure that with the appropriate development environment and having\n>> >> the hardware on hand IN a well equipped lab, it should be a weekend\n>> >> project to get running.\n>> >>\n>> >> The hard bit in my opinion is how to mount the antennas to the az/el\n>> >> clockwork. Will require a little woodwork/metalwork to finish.\n>> >>\n>> >> Everyone who does this will have a problem with some phase of it.\n>> >> Needs to be simple and repeatable.\n>> >>\n>> >> Norm n3ykf\n>> >> _______________________________________________\n>> >> Sent via [email protected]. Opinions expressed are those of the\n>> author.\n>> >> Not an AMSAT-NA member? Join now to support the amateur satellite\n>> program!\n>> >> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb\n>> >\n>> >\n>>\n>\n>\n",
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}