January 2012 - AMSAT-BB - mailman.amsat.org

EL97 on 7January AO-27
by John Papay 04 Jan '12

04 Jan '12

I've had several requests for EL97. I will plan to be on the AO-27 pass at 1824z or so on Saturday, 7 January 2012. This pass should work well for the eastern half of the US. If there are any west coast stations that need it, I will stay for the next AO-27 pass at 2005z. If you can't make the 1824z pass but want to try the next pass please email me. Otherwise I'll just operate on the 1824z pass. 73, John K8YSE/4

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Preliminary Keplerarian elements for Vega launch
by Andrew Glasbrenner 04 Jan '12

04 Jan '12

Does anyone have any preliminary keps for this one? I'm not so worried about whether they are correct with respect to launch/pass times, but just for a generic orbit of the same dimensions. I think it's supposed to be 350x1500km, 71 degree inclination, or thereabouts? 73, Drew KO4MA

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ARRISAT-1
by Pat McGrath 04 Jan '12

04 Jan '12

Can someone send me the Doppler SQF information for for ARRISAT-1? Thanks Pat McGrath Ka6tya

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arissat-1 reception with video.
by Malcolm Scrimger 04 Jan '12

04 Jan '12

As an avid Hamsat operator with limited equipment I was able to listen and record a pass of arissat-1 two days ago. My goal was to make a memento of sorts for my log of new acheivements for 2012. I thought some readers might like to see it. 73, VE7DAO / VA7ISS http://ve7dao.blogspot.com/2012/01/listening-to-arissat-1-with-arrow.html

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Moderation?
by Chris Maness 04 Jan '12

04 Jan '12

Is this list now moderated? I have joined with a new email address, and my messages from the new email have not come through yet. I am just wondering what is new with this reflector as it has been a very long time since I have posted here. Thanks, Chris Maness KQ6UP DM13

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Re: ARISSat-1 (37772) decay
by Fabio Azzarello 04 Jan '12

04 Jan '12

Hello Everybody, I totally agree with you James... the process is a continuous evolution. I did my prediction on October 6th for the "Chicken Little Competition" and my date was January 23rd 2012. It surprisingly agrees with your prediction done almost one month later, this make me think that my assumptions were right, up to now at least. 73s Fabio IW8QKU/5 Hi Jim, Thanks for the update on your AMSAT Journal article. There are several people on the bb who are following this topic and are busy plotting data. Any futher thoughts you have, as we move towards January would, I am sure be of interest. 73 John G7HIA ________________________________ From: DeYoung James <deyoung_james(a)yahoo.com> To: amsat-bb <amsat-bb(a)amsat.org> Sent: Tuesday, 15 November, 2011 17:29:31 Subject: [amsat-bb] ARISSat-1 (37772) decay Greetings, First, thank you Mineo for reading the AMSAT Journal and making several of my papers available on your web site. My AMSAT Journal paper published in the March/April 2011 issue is actually still fairly valid for the scenarios shown in the paper. The solar flux has turned out to be somewhat higher than was used/predicted in the paper. This has caused the atmospheric densities to be higher which results in higher decay rates. When I wrote the paper I had this nagging feeling that stopping the release height scenarios at 370-km was not going to be high enough. We are very fortunate that the ISS was boosted to such a height before release of ARISSat-1 and not after release! There is a valuable lesson, I think, to be made with respect to predicting satellite decay dates far into the future. The future state of the atmosphere, i.e. the atmospheric density that the satellite will pass through is poorly predictable in the long-term, say starting greater than a week or two into the future. Predictions of satellite decay dates months in the future should be evaluated with the understanding that your date of prediction errors may be large. The errors are due to the future uncertainties of the orbital path which grow quickly with time in a prediction. The atmospheric density is not the only source of error. Your orbit model, the integrator, and the accounting of the gravitational and drag forces among others will affect your results. Predictions of satellite decay dates are not do-and-forget. The general process is to make a prediction, get new measured observations of the height in the future, and at some point re-do your prediction when the errors become significant to you. With that all said here is my current prediction using the same tools used in the AMSAT J. paper and produced as of 2011 November 13th. The decay of ARISSat-1 (37772) will happen nominally on 2012 January 30th with a 10% rule-of-thumb error allowance of 18 days around this date. The errors may be larger than the rule-of-thumb indicates! Jim, N8OQ _______________________________________________ Sent via AMSAT-BB(a)amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb

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ARISSat-1 and Japan
by Clint Bradford 04 Jan '12

04 Jan '12

Hmmm ... One of the first reception reports of ARISSat-1 after deployment comes from JN1GKZ in Japan. And the satellite re-enters Earth's atmosphere - over Japan. Just wonderin' out loud ... (grin) Clint Bradford K6LCS

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Last Voice Heard from ARISSat-1
by Clint Bradford 04 Jan '12

04 Jan '12

The last pre-recorded voice message heard from ARISSat-1 today? That of Yuri Gagarin speaking to his ground crew. How appropriate. Clint Bradford, K6LCS

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WD9EWK at ThunderBird hamfest on Saturday (7 January) in Phoenix AZ
by Patrick STODDARD (WD9EWK/VA7EWK) 04 Jan '12

04 Jan '12

Hi! On Saturday (7 January) morning, I will be at the ThunderBird Amateur Radio Club's hamfest in Phoenix AZ with an AMSAT table. The hamfest is in a new location, and is back to being an outdoor event (it had been indoors for the last 3 years). More information about the hamfest is available at: http://www.w7tbc.org/hamfest.html During the hamfest, I will have satellite demonstrations using SO-50 and VO-52. Since I won't have to walk outside to do the demonstrations, I expect to be on all workable passes for these satellites. If you are on those passes, please call WD9EWK and say "hello" to the crowds. The hamfest site is in grid DM33. If anyone working WD9EWK during those demonstration passes wants a QSL card, please e-mail me with the QSO details. I will be happy to send you a card, without first receiving a card or SASE. All QSOs will be uploaded to the Logbook of the World as well. Thanks in advance, and 73! Patrick WD9EWK/VA7EWK http://www.wd9ewk.net/

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ANS-004 ANS Special Bulletin: ARISSat-1/KEDR Goes Silent
by JoAnne Maenpaa 04 Jan '12

04 Jan '12

AMSAT NEWS SERVICE ANS-004 SB SAT @ AMSAT $ANS-004.01 ANS-004 AMSAT News Service Special Bulletin: ARISSat-1/KEDR Goes Silent AMSAT News Service Bulletin 004.01 >From AMSAT HQ SILVER SPRING, MD. January 4, 2012 To All RADIO AMATEURS BID: $ANS-004.01 Reception reports indicate that ARISSat-1/KEDR has stopped trans- mitting on Wednesday, January 4, 2012. The last full telemetry captured and reported to the ARISSatTLM web site at 06:02:14 UTC on January 4 were received from ground stations as the satellite passed over Japan. See: http://www.arissattlm.org/live (full telemetry display) See: http://www.arissattlm.org/mobile (condensed telemetry) Telemetry reports showed that the temperature aboard ARISSat-1/KEDR had been rising as atmospheric drag began to affect the satellite. Final temperatures received via ARISSatTLM reported this data: IHU 75 ° C / 167.0 ° F PSU 76 ° C / 168.8 ° F RF 88 ° C / 190.4 ° F Control Panel 61 ° C / 141.8 ° F Experiment 64 ° C / 147.2 ° F Stations receiving telemetry from ARISSat-1 at any time over the last few months, please forward all of your .CSV telemetry files to telemetry AT arissattlm.org. Konstantin, RN3ZF sent a reception report of his copy of the 0842 UTC pass that, "the telemetry was absent, voice messages were not legible, very silent and interrupted. Most likely, I saw last minutes in the life of the satellite." Dee, NB2F reported, "Nothing heard from ARISSat-1/KEDR on any fre- quency during the first USA pass at 16:00 UTC, January 4." ARISSat-1/KEDR was deployed from the International Space Station on August 3, 2011 during during EVA-29 on by Cosmonaut/Flight Engineers Sergei Volkov and Alexander Samokutyaev. The satellite carried a student experiment from Kursk State University in Russia which measured atmospheric density. Students from around the world provided the voices for the FM voice announcements. The amateur radio payload aboard ARISSat-1/KEDR achieved many "firsts" for amateur radio in space: + First flight test of AMSAT Software Defined Transponder which trans- mitted simultaneous: - FM voice downlink cycling between student messages, spoken telemetry and SSTV from cameras on the spaceframe. - 16KHz bandwith linear transponder, - CW beacon with telemetry and callsigns of radio amateurs noting their significant contributions to amateur radio in space. - Robust, forward error corrected 1K rate BPSK downlink with sat- ellite telemetry and Kursk experiment telemetry. + Development and release of the ARISSatTLM software for PC and Mac platforms enabled amateur stations worldwide with reliable reception of the BPSK telemetry, CW telemetry, display on the station's com- puter, and automatic upload of received data via the internet to the ARISSat engineering team. + A new Integrated Housekeeping Unit was developed and successfully flown. + A new Power Management System was developed and successfully flown. AMSAT President Barry Baines, WD4ASW noted, ARISSat-1/KEDR marked a new type of satellite which has captured the attention of the national space agencies around the world for the unique educational opportunity we have been able to design, launch, and operate. By designing an edu- cational mission aligned with NASA's Science, Technology, Engineering, and Mathematics goals amateur radio operators around the world have been able enjoy a new satellite in orbit." ARISSat-1/KEDR Project Manager, Gould Smith, WA4SXM said, "Dozens of amateur radio volunteers, AMSAT, ARRL, NASA, and Energia teamed up for this successful mission to bring you the most unique and innovative amateur radio satellite mission. Congratulations to all who made ARISSat-1 successful!" [ANS thanks the ARISSat-1/KEDR Team for the above information] /EX

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