October 2014 - AMSAT-BB - mailman.amsat.org

Office Closed
by Martha 31 Oct '14

31 Oct '14

The AMSAT office will be closed on Monday, November 3rd. -- 73- Martha

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Re: [amsat-bb] ICOM 706G phase noise
by dnkucij＠myfairpoint.net 31 Oct '14

31 Oct '14

Here's the AMSAT link about "Desense" that describes the method to try. http://ww2.amsat.org/?page_id=2136 GL Nick, KB1RVT

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Special-event station for 40th anniversary of OSCAR 7 launch
by Patrick STODDARD (WD9EWK/VA7EWK) 31 Oct '14

31 Oct '14

Hi! I have secured the special call sign W7O (WHISKEY SEVEN OSCAR) for use in commemorating the 40th anniversary of the launch of OSCAR 7 on 15 November 1974. I plan on having this call on the air between 15 and 24 November 2014, working satellites and possibly other bands. I will work satellite passes from Arizona, including AO-7 passes, and hope to recruit a small group of operators who can work other passes that cover eastern North America along with other places I can't work from here (Europe, north Africa, South America). I may also try to get some operators working HF with this call. I will handle the QSL requests for W7O during this period. I am thinking of incorporating the original QSL card design AMSAT used to confirm AO-7 reception reports from the 1970s in the W7O card. (Does anyone have a good scan of both sides of that 1970s QSL card? Not the 30th anniversary AO-7 card - I have those, and there is a copyright on that design I do not wish to violate.) The QSL cards will be printed after the W7O activity wraps up. I will also upload W7O QSOs to ARRL's Logbook of the World system. Please contact me directly if you have any questions related to this operation, or if you are willing to operate on satellites and/or HF as W7O during this 10-day period. Thanks in advance, and 73! Patrick WD9EWK/VA7EWK http://www.wd9ewk.net/

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Chinese Spacecraft To Return 2014-10-31 EDT
by B J 31 Oct '14

31 Oct '14

http://www.spacepolicyonline.com/news/chinas-lunar-sample-return-test-space… Additional details about a third of the way down the page at: http://planet4589.org/space/jsr/back/news.704 73s Bernhard VA6BMJ @ DO33FL

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NASA Completes First Review of Wallops Launch Site Damage
by Eric Rosenberg 31 Oct '14

31 Oct '14

>From Via Satellite: ---------------------- NASA Completes First Review of Wallops Launch Site Damage By Caleb Henry | October 30, 2014 | Satellite TODAY News Feed [Via Satellite 10-30-2014] NASA's Wallops Incident Response Team has concluded its preliminary assessment of the launch pad at Wallops Island, Va. following Orbital Sciences' Oct. 28 Antares launch vehicle explosion. Initial findings show the damage was largely contained to the southern third of the island. The team discovered imploded doors and shattered windows at many nearby support buildings. The closest buildings and a sounding rocket launcher adjacent to the pad were the most affected infrastructure. The transporter erector launcher and lightning suppression rods at Pad 0A were also damaged. Several environmental tests are currently underway. Air samples from three different sites detected no hazardous substances, and the U.S. Coast Guard and Virginia Marine Resources Commission have not observed obvious signs of water pollution, such as oil sheens. More testing of air, water, and soil samples are planned for comparative analysis. The response team will take several weeks to continue evaluating the extent and influence of the damage. Local authorities such as the Virginia Department of Environmental Quality, the Virginia Department of Emergency Management and the Virginia Marine Police are also involved. NASA cautions anyone who discovers debris from the explosion to keep distance and report it to the Incident Response Team at 757-824-1295.

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I love not having responsibilities anymore
by Tom Lubbers K8TL 31 Oct '14

31 Oct '14

http://drwebkulim.com/enzwfzjow/orezyd.htm?googleid=659519_sid=9031566

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Antares OK During First Few Seconds
by B J 30 Oct '14

30 Oct '14

http://www.spacepolicyonline.com/news/data-show-antares-rocket-fine-for-fir… Initial review completed: http://www.americaspace.com/?p=70000 73s Bernhard VA6BMJ @ DO33FL

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Did you attend the BWI Board Meeting, or know someone who did?
by Alan 30 Oct '14

30 Oct '14

Hi, We try to preserve for posterity a list of those who observed or gave presentation to the Board. While not required, if you would like to be included, let me know. We already have the various officers and members. Here is our current list: Bill Tynan, W3XO Clayton Coleman, W5PFG Dan Schultz, N8FGV Dave Taylor, W8AAS Hector L. Martinez, CO6CBF/KF5XYV Jennifer Rojowski, N8GZL Jim Hain, W2IMY Joe Fitzgerald, KM1P Keith Pugh, W5IU Jan King, W3GEY Kira Gantt Nick Pugh, K5QXJ Pat Kilroy, N8PK Patrick Stoddard, WD9EWK Phil Karn, KA9Q Ray Hoad, WA5QGD 73s, Alan WA4SCA Corporate Secretary

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Torque Coil turns vanish?
by Robert Bruninga 29 Oct '14

29 Oct '14

I keep coming up with the number of turns of a torque coil vanishing with respect to torque (for a given wire size). Given that Torque = A x B x I x n where A is area, B is field, I is current and n is number of turns. But I is inversely proportional to the length of wire (resistance). I = V/R but R is proportional to n. Hence the number of turns. So I is proportional to V/n. But V is fixed in the cubesat, (5v) area is fixed (where we can put the coil) and so plugging in, T = A x B x V/n x n and the n’s cancel. So I can get the same torque with –any- number of turns for a given size wire. What changes with turns, of course, is the current. So to save spacecraft power, the more turns, the less current, and thus, the least power for the same torque. Interesting result. We ended up with 600 turns of #34 wire to keep the current at 25 mA so we can drive it directly from a CPU pin. I wonder where’s the limit? Infinitie number of turns… Zero current? I guess you run out of space. AH HA! Yes, that was it. We started with #30 wire but it took so many turns to get to below the 25 mA, that there wasn’t room for the coil. So we went to smaller wire and ended up with the #34 to give us a ¼” thick coil with 600 turns to give 25 mA. But I just always found it interesting that once you have chosen the wire size, the number of turns is only determined by the current you want. The Torque is constant. Bob, WB4APR

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Re: [amsat-bb] Torque Coil turns vanish?
by Joe Leikhim 29 Oct '14

29 Oct '14

I am no rocket scientist, but wouldn't the earths magnetic fields tend to bias those diodes on as the satellite cuts through them, creating subtle drag? Joe K4SAT ------------------------------------------------------------------------ _ __Amen, one has to have kickback diodes to the rails to absorb that energy. (Else, poof goes the pin) Bob_ -- Joe Leikhim Leikhim and Associates Communications Consultants Oviedo, Florida JLeikhim(a)Leikhim.com 407-982-0446 WWW.LEIKHIM.COM

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