August 2011 - AMSAT-BB - mailman.amsat.org

Videos of Presentations given at AMSAT-UK Colloquium
by Trevor . 15 Aug '11

15 Aug '11

Thanks to the hard work of volunteers from the British Amateur Television Club (BATC) 14 videos of the presentations given to the AMSAT-UK International Space Colloquium held in Guildford July 30-31 are now available. You can watch the video online at http://www.batc.tv/ Click on the 'Film Archive' icon Select 'AMSAT 2011' from the Category drop down menu Click 'Select Category' Select the video you wish to watch Click on 'Select Stream' Click the play icon '>' on the player Clicking on the icon to the left of the player volume control will give you full screen display. You can also download a video file to your PC by clicking on the 'Click Here' link under the player. Some of the PowerPoint slides can also be downloaded by following the links in the Videos story at http://www.uk.amsat.org/ 73 Trevor M5AKA

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ARRISat-1 Keps now available from Celestrak
by Alan P. Biddle 15 Aug '11

15 Aug '11

Just checked the latest AMATEUR.TXT download from Celestrak, used by many tracking programs. ARRISat-1 is now included, though with the alternate name RADIOSCAF-B. Thanks as always to Tim Kelso. Alan WA4SCA

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AO-40/P3D image wanted
by John Heath 15 Aug '11

15 Aug '11

Hi, Can anyone on the list point me to source of high resolution images of AO-40/P3E. Need it for a magazine article. The images found via google are all low res. Tried Peter DB2OS at amsat-dl but no reply as yet, and my deadline is two days away. Thanks John G7HIA

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ARISSat-1 Battery
by Anthony Monteiro 15 Aug '11

15 Aug '11

Dear Friends, This is speculation but it looks to me like we have had a bit of good luck regarding the battery. Looking at the battery voltage from deployment on... Up until Aug 11, the battery seems to be deteriorating "normally" with a slight downtrend in the max voltage as expected. But on Aug 11, the battery voltage suddenly rises up to 36 V max and the satellite has started resetting in eclipse. I think the explanation is that the battery experienced a significant event on Aug 11 where it lost the electrolyte in one or more cells. If this is true, the bad news is that it will no longer hold a charge and will not operate in eclipse any more. But the good news is that without electrolyte, it would also stop dendrite growth that causes the eventual battery short circuit. In our ground testing, our test battery failed in the usual way with the battery load increasing until the solar panels could not drive the power bus high enough to run the satellite. But interestingly, several cells also cracked and dumped their electrolyte during this testing. If a cell on the flight battery cracked and dumped its electrolyte BEFORE the shorts were formed, it should stay that way and the satellite may very well continue to operate in the sun until it starts to re-enter. We just need some luck to avoid a bad solar angle that would cause a reset in sunlight. Keep your fingers crossed! :) 73, Tony AA2TX

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ESMO: An Inspirational Hands-On Space Education Project to the Moon
by Trevor . 15 Aug '11

15 Aug '11

Thanks to the hard work of volunteers from the British Amateur Television Club (BATC) the video of the presentation on the European Student Moon Orbiter (ESMO) given by Dr. Susan Jason to the AMSAT-UK Colloquium is now available. You can watch the video online at http://www.batc.tv/ Click on the 'Film Archive' icon Select 'AMSAT 2011' from the Category drop down menu Click 'Select Category' Select video 'ESMO Update' Click on 'Select Stream' Click the play icon '>' on the player Clicking on the icon to the left of the player volume control will give you full screen display. You can also download the video file to your PC http://www.batc.tv/vod/ESMO.flv The PowerPoint slides are at <http://www.uk.amsat.org/wp-content/uploads/colloquium 2011/ESMO-Presentation-for-AMSAT-UK-2011.ppt> AMSAT-UK publishes a color A4 newsletter, OSCAR News, which is full of Amateur Satellite information. Join online at http://tinyurl.com/JoinAMSAT-UK/ The Spring OSCAR News can be seen at http://www.uk.amsat.org/on_193_final.pdf AMSAT-UK: http://www.uk.amsat.org/ 73 Trevor M5AKA

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ARISSAT-1 Voice Telemetry
by Mike Schaffer 15 Aug '11

15 Aug '11

Voice telemetry (40 seconds) reception on Sun., Aug 14 at 01:01 UTC on 145.950 FM during low power eclipse mode while over Jacksonville, FL. Satellite tracking showed Azimuth: 032, Elevation: +52 Telemetry Data: MET is 67 minutes IHU Temp is +47 degrees C Control Panel Temp is +57 C Battery Voltage is 36.09 volts Battery Current is -12 ma 73's Mike Schaffer KA3JAW Tampa, Florida EL87

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ARISSat-1 over Sacramento, CA at 2145 PDT
by wf6j 15 Aug '11

15 Aug '11

Here is the audio I copied from ARISSAT-1 on the 9:45 pm PDT pass over Sacramento, CA tonight. While dark out here, you can hear the voice say: NEC Temp A+40 degrees C COntrol Panel Temp A+42 degrees C Battery VOltage A 35.74 volts after that I wasn't sure what was said, but attached is the audio file. 73, Carl, WF6J wf6j(a)sbcglobal.net

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Arissat transponder active over Europe.
by Eric Knaps, ON4HF 15 Aug '11

15 Aug '11

Hello, I was listening to a 21:05 utc pass over Europe and got a nice sstv picture and voice telemetry in full power mode. Since I was listening with a FCD I saw activity on the transponder also. I heard EA1JM calling cq. As soon as it went in eclipse I heard nothing anymore untill LOS. 73, Eric. -- Amateur Radio Station ON4HF Eric Knaps Satellite manager UBA Tel. +32472985876 (mobile) http://www.on4hf.be

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ARISSat-1 Telemetry
by Greg D. 15 Aug '11

15 Aug '11

I caught two sets of voice telemetry on the 04:44z pass over Northern California: MET = 64 IHU temp = 41c Control panel temp = 42c Battery voltage = 35.73v Current = -20ma MET =69 IHU temp = 40c Control panel temp = 42c Battery voltage = 35.74v Current = +0ma Looks like the temperature situation has improved considerably. I also heard the "secret word", but it was different than the last time (a few days ago). Is there more than one per language (both were in English)? Greg KO6TH

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Telemetry Data
by Dianne 14 Aug '11

14 Aug '11

Hello, You asked for "emergency mode" data, and I'm not sure what you meant, but I have some that may or may not qualify. We are located in San Diego, California At 03:07 UTC (8:07 PM PDT (local)) MET was 62 minutes IHU Temp was +45 degrees C Control Panel Temp was +50 degrees C Battery Voltage was 33.77 V Battery Current was -8 mA At 03:12 UTC (8:12 PM PDT (local)) MET was 67 minutes IHU Temp was +45 degrees C Control Panel Temp was +50 degrees C Battery Voltage was 35.73 V Battery Current was -8 mA The "secret words" that we heard were the ones from the two American boys ("Explore") and the two British girls ("Eagle") I don't know if that was what you were looking for, or if it was at all helpful, but I figured you'd rather have extra data than not. -Lindsay White KI6LZN www.mchsarc.com <http://www.mchsarc.com/>

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