[amsat-dc] inquiry about homebrew az-el systems (Samudra Haque)

Pat Kilroy pat at patkilroy.com
Mon Feb 25 11:09:15 PST 2013


Hi Samudra,

Gosh, here are some of the oodles of plans 
out there for different az-el antenna pointing 
solutions to get you started. See below. 

I'm sorry I don't have info on motor suppliers
or the other items you mention. Hope these 
might be helpful none the less to you and 
others. 

Cheers,

Pat Kilroy
N8PK

>From ANS-020 released Saturday, January 19, 
mainly introducing our Workshop on Portable 
Satellite Ground Stations, but includes buried 
nuggets on antennas and az-el: 

Links for antenna ideas:
http://arrowantennas.com/
http://www.elkantennas.com/
http://www.g6lvb.com/homebrewarrow.htm
http://www.amsat.org/amsat-new/information/faqs/crow/index.php
http://www.amsat.org/amsat-new/echo/Az_El_Pos.pdf
http://www.wa5vjb.com/references/Cheap%20Antennas-LEOs.pdf
http://www.amsat.org/amsat-new/tools/downloads/iROTOR.pdf
http://www.arrl.org/shop/The-ARRL-Satellite-Handbook/
http://ac6v.com/antprojects.htm
Links for software ideas:
http://www.amsat.org/amsat-new/tools/software.php
http://www.amsat.org/amsat-new/tools/
http://www.moetronix.com/spectravue.htm
http://www.amsat.org/amsat-new/information/faqs/resguide.pdf
http://sdrsharp.com/

>From ANS-048 released Saturday, February 16: 
http://www.vk3um.com and http://www.vk5dj.com/satellite.html and then derived: 
http://www.muratamems.fi/sites/default/files/documents/sca61t_inclinometer_datasheet_8261900a2_0.pdf
and http://www.digikey.com/product-detail/en/SCA61T-FA1H1G-1/551-1005-1-ND/751309

The LVB Tracker Box by Howard Long, G6LVB: 
http://store.amsat.org/catalog/product_info.php?products_id=63

>From ANS-041 released Saturday, February 9: 
ANS Archives
http://amsat.org/pipermail/ans/

Me? I must be choosy on which wheels I re-invent, 
especially when I need proven/reliable operations 
out of a station component, such as Az-El motion. 
I use a heavy duty camera tripod to steer portable 
antennas, and I cheated and got the Yaesu G-5500 
combo ($730) for portable, semi-portable and fixed 
operations:
http://www.hamradio.com/detail.cfm?pid=H0-002765


-----Original Message-----
From:amsat-dc-request at amsat.org
Sent: Sunday, February 24, 2013 03:00 PM
To: amsat-dc at amsat.org
Subject: AMSAT-DC Digest, Vol 8, Issue 13

Send AMSAT-DC mailing list submissions to amsat-dc at amsat.org To subscribe or unsubscribe via the World Wide Web, visit http://amsat.org/mailman/listinfo/amsat-dc or, via email, send a message with subject or body 'help' to amsat-dc-request at amsat.org You can reach the person managing the list at amsat-dc-owner at amsat.org When replying, please edit your Subject line so it is more specific than "Re: Contents of AMSAT-DC digest..." Today's Topics: 1. inquiry about homebrew az-el systems (Samudra Haque) ---------------------------------------------------------------------- Message: 1 Date: Sat, 23 Feb 2013 18:59:35 -0500 From: Samudra Haque To: "amsat-dc at amsat.org" , Amsat-bb Subject: [amsat-dc] inquiry about homebrew az-el systems Message-ID: Content-Type: text/plain; charset=ISO-8859-1 Hi, about two years ago, I started a design for a robotics class project of a AZ-EL rotator controller system, and a hardware package for the mechanism for rotating an antenna in any direction subject to mechanical stops. The system would have been able to handle regular and flip modes. I didn't do anything more than calculations, and moved on to building a classroom instructional robot then. Lately, as I am setting up (K3GWU, the George Washington University Amateur Radio Club and Research Station) I find that the price of az-el systems such as G5500 + Yaesu AZ-EL rotors are expensive, and are not typically available on an affordable basis on Ebay or eham.net etc. Well, of course, expensive is a relative term, for a student hobby organization, it's a lot, and I guess for small ham operators it is also moderately expensive. This may be a frequently asked topic: does any one have experienced with (tested) kit designs for AZ-EL rotors that can be made with parts from current suppliers ? I know there are a number of controller designs, but I am interested to know if there are any options for suppliers of the required gears/motors etc. I have located several large AC motors / DC motors at my university mechanical engineering workshop, but they are not all guaranteed the same specs. I now realize if I do embark on a actual design process with my model/simulation/hardware, it would be nice to build several of these all at once to share the development cost over the production run, and ensure those who want a cheap AZ-EL system can get one. Otherwise the production cost of one heavy duty system is going to be quite high. I hope some of you may have suggestions for me, both (+) and (-) or perhaps (~) in nature. I thought amsat / amateur radio folks have a common need to encourage homebrew activity to keep their brain cells in working condition? I'm opening this question up to the national US audience, and welcome any discussion on the challenges of making the ever-so-important azimuth-elevation rotor. I've studied some of the alternatives: Alliance U100 and Yaesu G-5500. I think we can do better in 2013. But ideally, to allow the wide adoption of AMSAT ground stations, what price point would the system have to be to make it worth building ? 73 de N3RDX George Washington University ------------------------------ _______________________________________________ AMSAT-DC mailing list courtesy of AMSAT-NA AMSAT-DC at amsat.org http://amsat.org/mailman/listinfo/amsat-dc End of AMSAT-DC Digest, Vol 8, Issue 13 *************************************** 




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