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{ "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/3YFMJFGCIMUSERPV7L76ARFMLCSLDPOE/?format=api", "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api", "message_id": "CAJEM476KP8AvDyWCeH7iXarv2mWzR8RD2OstBrXNSTpD2jY_Pw@mail.gmail.com", "message_id_hash": "3YFMJFGCIMUSERPV7L76ARFMLCSLDPOE", "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/3YFMJFGCIMUSERPV7L76ARFMLCSLDPOE/?format=api", "sender": { "address": "samudra.haque (a) gmail.com", "mailman_id": null, "emails": null }, "sender_name": "Samudra Haque", "subject": "[amsat-bb] Re: [amsat-dc] inquiry about homebrew az-el systems\t(Samudra Haque)", "date": "2013-02-25T19:19:24Z", "parent": null, "children": [ "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/Y4MCTMBFMU3PCPFIH2PQ2DBF3YFWRANU/?format=api" ], "votes": { "likes": 0, "dislikes": 0, "status": "neutral" }, "content": "Thanks Pat, I'm going to have to spend a bit of time after two weeks from\npresent to collate all the work done to date in a methodical analysis and\nsee if there is any trend, or benefit to a particular design and what the\noptions are for small batch kit form production.\n\n73 de X\n\n\nOn Mon, Feb 25, 2013 at 2:09 PM, Pat Kilroy <[email protected]> wrote:\n\n> Hi Samudra,\n>\n> Gosh, here are some of the oodles of plans\n> out there for different az-el antenna pointing\n> solutions to get you started. See below.\n>\n> I'm sorry I don't have info on motor suppliers\n> or the other items you mention. Hope these\n> might be helpful none the less to you and\n> others.\n>\n> Cheers,\n>\n> Pat Kilroy\n> N8PK\n>\n> From ANS-020 released Saturday, January 19,\n> mainly introducing our Workshop on Portable\n> Satellite Ground Stations, but includes buried\n> nuggets on antennas and az-el:\n>\n> Links for antenna ideas:\n> http://arrowantennas.com/\n> http://www.elkantennas.com/\n> http://www.g6lvb.com/homebrewarrow.htm\n> http://www.amsat.org/amsat-new/information/faqs/crow/index.php\n> http://www.amsat.org/amsat-new/echo/Az_El_Pos.pdf\n> http://www.wa5vjb.com/references/Cheap%20Antennas-LEOs.pdf\n> http://www.amsat.org/amsat-new/tools/downloads/iROTOR.pdf\n> http://www.arrl.org/shop/The-ARRL-Satellite-Handbook/\n> http://ac6v.com/antprojects.htm\n> Links for software ideas:\n> http://www.amsat.org/amsat-new/tools/software.php\n> http://www.amsat.org/amsat-new/tools/\n> http://www.moetronix.com/spectravue.htm\n> http://www.amsat.org/amsat-new/information/faqs/resguide.pdf\n> http://sdrsharp.com/\n>\n> From ANS-048 released Saturday, February 16:\n> http://www.vk3um.com and http://www.vk5dj.com/satellite.html and then\n> derived:\n>\n> http://www.muratamems.fi/sites/default/files/documents/sca61t_inclinometer_datasheet_8261900a2_0.pdf\n> and\n> http://www.digikey.com/product-detail/en/SCA61T-FA1H1G-1/551-1005-1-ND/751309\n>\n> The LVB Tracker Box by Howard Long, G6LVB:\n> http://store.amsat.org/catalog/product_info.php?products_id=63\n>\n> From ANS-041 released Saturday, February 9:\n> ANS Archives\n> http://amsat.org/pipermail/ans/\n>\n> Me? I must be choosy on which wheels I re-invent,\n> especially when I need proven/reliable operations\n> out of a station component, such as Az-El motion.\n> I use a heavy duty camera tripod to steer portable\n> antennas, and I cheated and got the Yaesu G-5500\n> combo ($730) for portable, semi-portable and fixed\n> operations:\n> http://www.hamradio.com/detail.cfm?pid=H0-002765\n>\n>\n> -----Original Message-----\n> From:[email protected]\n> Sent: Sunday, February 24, 2013 03:00 PM\n> To: [email protected]\n> Subject: AMSAT-DC Digest, Vol 8, Issue 13\n>\n> Send AMSAT-DC mailing list submissions to [email protected] To subscribe\n> or unsubscribe via the World Wide Web, visit\n> http://amsat.org/mailman/listinfo/amsat-dc or, via email, send a message\n> with subject or body 'help' to [email protected] You can reach\n> the person managing the list at [email protected] When replying,\n> please edit your Subject line so it is more specific than \"Re: Contents of\n> AMSAT-DC digest...\" Today's Topics: 1. inquiry about homebrew az-el systems\n> (Samudra Haque)\n> ----------------------------------------------------------------------\n> Message: 1 Date: Sat, 23 Feb 2013 18:59:35 -0500 From: Samudra Haque To: \"\n> [email protected]\" , Amsat-bb Subject: [amsat-dc] inquiry about homebrew\n> az-el systems Message-ID: Content-Type: text/plain; charset=ISO-8859-1 Hi,\n> about two years ago, I started a design for a robotics class project of a\n> AZ-EL rotator controller system, and a hardware package for the mechanism\n> for rotating an antenna in any direction sub!\n> ject to mechanical stops. The system would have been able to handle\n> regular and flip modes. I didn't do anything more than calculations, and\n> moved on to building a classroom instructional robot then. Lately, as I am\n> setting up (K3GWU, the George Washington University Amateur Radio Club and\n> Research Station) I find that the price of az-el systems such as G5500 +\n> Yaesu AZ-EL rotors are expensive, and are not typically available on an\n> affordable basis on Ebay or eham.net etc. Well, of course, expensive is a\n> relative term, for a student hobby organization, it's a lot, and I guess\n> for small ham operators it is also moderately expensive. This may be a\n> frequently asked topic: does any one have experienced with (tested) kit\n> designs for AZ-EL rotors that can be made with parts from current suppliers\n> ? I know there are a number of controller designs, but I am interested to\n> know if there are any options for suppliers of the required gears/motors\n> etc. I have located several large AC mo!\n> tors / DC motors at my university mechanical engineering workshop, but\n> they are not all guaranteed the same specs. I now realize if I do embark\n> on a actual design process with my model/simulation/hardware, it would be\n> nice to build several of these all at once to share the development cost\n> over the production run, and ensure those who want a cheap AZ-EL system can\n> get one. Otherwise the production cost of one heavy duty system is going to\n> be quite high. I hope some of you may have suggestions for me, both (+) and\n> (-) or perhaps (~) in nature. I thought amsat / amateur radio folks have a\n> common need to encourage homebrew activity to keep their brain cells in\n> working condition? I'm opening this question up to the national US\n> audience, and welcome any discussion on the challenges of making the\n> ever-so-important azimuth-elevation rotor. I've studied some of the\n> alternatives: Alliance U100 and Yaesu G-5500. I think we can do better in\n> 2013. But ideally, to allow the wide adoption of AMSAT ground stations,\n> what price point would the system have to b!\n> e to make it worth building ? 73 de N3RDX George Washington University\n> ------------------------------\n> _______________________________________________ AMSAT-DC mailing list\n> courtesy of AMSAT-NA [email protected]\n> http://amsat.org/mailman/listinfo/amsat-dc End of AMSAT-DC Digest, Vol 8,\n> Issue 13 ***************************************\n>\n>\n> _______________________________________________\n> Via the AMSAT-DC mailing list courtesy of AMSAT-NA\n> [email protected]\n> http://amsat.org/mailman/listinfo/amsat-dc\n>\n", "attachments": [] }