AMSAT-BB March 2013

106 participants
121 discussions

by K&R Yoksh

Hello, Does anyone have a working G5400 or G5500 az/el rotator for sale? I may also be interested in a Yaesu azimuth rotator, as I already have a g500 elevation rotator. I'm not sure which azimuth rotator Yaesu uses for their az/el, might be nice to know if anyone can tell me. Thanks. 73 Kyle K0KN

9 years, 4 months

Found interesting opportunity

by bpn518＠aol.com

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9 years, 4 months

STRaND 1 and AAUSAT3 TLE (No longer part of tle-new.txt)

by PE0SAT | Amateur Radio

Hi, Thanks for reading. The CubeSats STRAND 1 and AAUSAT3 are no longer part of tle-new.txt but I can't find them in any of the other tle file. Does anybody now where they will be part of? -- With regards PE0SAT Internet web-page http://www.pe0sat.vgnet.nl/

9 years, 4 months

_3/29/2013 1:30:58 PM_

by Peter Ng

http://www.estudiodutallaz.com/ea/tuvyn.ptji?vke 3/29/2013 1:30:58 PM 3/29/2013 1:30:58 PM

9 years, 4 months

Pyongyang satellite article

by M5AKA

The latest issue of the MNASSA newsletter has an interesting article by Greg ZS1BI on the recent launch by Pyongyang of a rocket and satellite. It can be downloaded from http://www.mnassa.org.za/html/Feb2013/2013MNASSA..72..Feb_print.pdf Archive of all MNASSA newsletters at http://www.mnassa.org.za/ 73 Trevor M5AKA ----

9 years, 4 months

Ground station survey

by James Cutler

Dear AMSAT Community, As we have done in the past, we are surveying the community for ground station capabilities. The goal is to estimate how much capacity the community has and our ability to support a variety of missions. The survey is located online at: http://gs.engin.umich.edu/gs_survey/ Some of our initial results are published there from a few years ago. If you have a ground station, we would love to hear from you! Thanks for your help. --Jamie, KF6RFX -- James W. Cutler, Assistant Professor University of Michigan Department of Aerospace Engineering 1320 Beal Avenue 3013 FXB Building Ann Arbor, MI 48109-2140 Ph: 734-615-7238 Fax: 734-763-0578 http://www.umich.edu/~jwcutler/

9 years, 4 months

inquiry about homebrew az-el systems

by Samudra Haque

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

9 years, 4 months

CQ DX on FO-29

by Hector, CO6CBF

Hello to all, FO-29 is getting close to apogee and has a big footprint around the 1400z passes. Please, if you are into the footprint with EL92sd and want to try a contact, just drop me an off list email. I will be happy to try a contact with you! I can operate portable from a tall building where I can work FO-29 until LOS and sometimes below the horizon. Cubans cannot operate on AO-7 mode B due to a 432MHz restriction in our country, so we have only a few chances every five months to try distant contacts on Sat. Please, if you know about someone who want to try but doesn't read AMSAT-BB, I will appreciate the information. Thanks & 73! Hector, CO6CBF EL92sd

9 years, 4 months

AMSAT-UK on Twitter

by Rob styles

Just a reminder, you can follow AMSAT-UK on Twitter @amsat_uk and visit our website at http://amsat-uk.org/ 73 Rob M0TFO A-UK

9 years, 4 months

STRaND-1 Telemetry Spreadsheet Update

by M5AKA

New STRaND-1 telemetry spreadsheet http://amsat-uk.org/2013/03/27/new-strand-1-telemetry-spreadsheet/ Also see DK3WN magnetic field vector analysis http://www.dk3wn.info/p/?p=31826 British Interplanetary Society KickSat Sprite programming and planning day http://amsat-uk.org/2013/03/25/bis-kicksat-programming-planning-day/ Video - WD9EWK working FO-29 from Scottsdale (Arizona) Hamfest http://amsat-uk.org/2013/03/24/wd9ewk-working-fo-29-using-qrp/ Video - Dnepr Launch Animation http://amsat-uk.org/2013/03/25/dnepr-launch-animation-video/ ---- Trevor M5AKA AMSAT-UK http://www.amsat-uk.org/ Join or Renew your AMSAT-UK membership at http://shop.amsat.org.uk/shop/category_7/Membership-of-AMSAT-UK.html ----

9 years, 4 months

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AMSAT-BB March 2013