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

Cause Of Recent Launch Failures Identified
by B J 30 Aug '11

30 Aug '11

http://spaceflightnow.com/news/n1108/30investigation/ 73s Bernhard VA6BMJ @ DO33FL

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Antenna advice please
by John Heath 30 Aug '11

30 Aug '11

Hi, At a new QTH and setting up a dual band quad antenna for 2m and 70cm. I plan to make the 70cms antenna,the vertically polarised one, 2m horizontal, as I believe this is the normal arrangement. If anyone has practical experience that goes against this assumption I would be interested, either direct on on the bb. I don't have polar phasers, switchable delay lines or anything else its just a straight choice, which one goes vertical. They are on the same boom so I suppose I could go slant for both ? Main activity here will be phone, VO-52, AO-51, FO-29 plus satellite telemetry from cubesats etc. Thanks in advance John G7HIA

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ARISSat transponder
by Sebastian, W4AS 30 Aug '11

30 Aug '11

At the 1850z pass, ARISSat passed at approximately 20 degrees for me. I hadn't tried the SSB transponder in a while, and decided to give it a go. Once I found my downlink, it was loud and clear throughout most of the past. Called CQ for several minutes, but no takers. Those who haven't tried it, really should. 73 de Sebastian, W4AS

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New ARISSat-1 telemetry page "live" on the web
by Douglas Quagliana 30 Aug '11

30 Aug '11

All, For those of you who are following the ARISSat-1 telemetry, we now have a second web page with decoded telemetry available at http://www.arissattlm.org/live This page is intended to be viewed on a computer (or large screen computing device). It shows all of the telemetry values that you would see if you were running ARISSatTLM. The advantage of the web page is that it is powered by submissions from other amateur radio ground stations, and it is updated once a minute whenever ARISSat-1 is in range of a telemetry forwarding ground station. Since it depends on stations forwarding telemetry over the Internet, there will occasionally be periods without any updates. The original ARISSat-1 telemetry page at http://www.arissattlm.org/mobile is still up and running. The difference is that the "mobile" page is designed to be viewed on a cellphone or other small screen computing device. Both pages are updated at the same time from the same telemetry. The "live" page just shows more telemetry. Please keep forwarding in your telemetry over the Internet. Also, if you received any telemetry from ARISSat-1, even if you are forwarding, please email the .CSV file(s) to telemetry at arissattlm dot org. The .CSV files are in the "Telemetry" folder which is in the ARISSatTLM folder on your desktop. Thanks and 73, Douglas KA2UPW/5

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Response to my request of information about EduSat from GAUSS team in Rome: Re: [CubeSat] Edusat operative or failure
by Gi. (Ab2vy) 30 Aug '11

30 Aug '11

Hi to all, this is what I have received from GAUSS team in Rome about my request of Info about Edusat, they talk about of "Non Amateur Radio satellite"... 73 de Giulio AB2VY Sent from my BlackBerry® wireless device -----Original Message----- From: Group of Astrodynamics <gauss.group(a)gmail.com> Date: Tue, 30 Aug 2011 00:11:38 To: <giuliop70(a)aol.com> Cc: <cubesat(a)cubesat.org> Subject: Re: [CubeSat] Edusat operative or failure Dear all, this is the GAUSS group which is in charge of Edusat satellite. We want to calm down Giulio: Edusat mission is carrying on flawlessly. We have communicated with it and he told us that the weather is a bit chilly but the panorama is great. We have seen that many wrong informations are reported on the web. For example, all the radio frequencies are wrong. Edusat is not a radioamateur satellite and has an experimental license for communicating. We didn't thought our satellite could be so interesting for the space community. Thank you for giving us so much attention. 2011/8/29 Gi. (Ab2vy) <giuliop70(a)aol.com> > Hi to all the members, knowing that Edusat is not pretty a cubesat.., I'm > looking for some informations or reports about the bird, because , > monitoring the spectrum of UHF and S-Band from the launch to today , NO > Signals was received from ground stations in US and EU (same thing for > Nigeriasat) is there a problem on the mission? > Thanks for any reports > 73 de Giulio AB2VY > > Sent from my BlackBerry® wireless device >_______________________________________________ > CubeSat mailing list > CubeSat(a)cubesat.org > http://lists.cubesat.org/mailman/listinfo/cubesat > -- Gruppo di Astrodinamica Università degli Studi Sapienza Via Salaria, 851 00138 Roma website: www.gaussteam.com tel. 0039 06 88346436

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Re: ARISSat transponder
by GW1FKY＠aol.com 30 Aug '11

30 Aug '11

Hi Sebastian, I have had similar experiences over the past few days here in Wales ( UK) during the higher daylight passes which now transpire. I was really surprised how strong my downlink was and I only use an "ELK" antenna ( with tracking ) software. No replies to my calls but I did hear others keying / tuning on to my operating frequency. Strange though as I also know of reports from others whom had no response. Perhaps with the rapid changes that have transpired one has to just be lucky with conditions being concident. Will also keep on trying - Good Luck to all and pleased to see that at least the transponder has benn functional. Ken Eaton GW1FKY Amsat -UK Amsat NA

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Russian Launchers Grounded
by B J 29 Aug '11

29 Aug '11

http://spaceflightnow.com/news/n1108/28russia/ One possible consequence: http://spaceflightnow.com/station/exp28/110827unmannedops/ http://spaceflightnow.com/station/exp28/110829update/ 73s Bernhard VA6BMJ @ DO33FL

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ARRISAT - BPSK100 and the FT897D
by Randy 29 Aug '11

29 Aug '11

Does anyone else on the list use this Radio to receive the BPSK1000 and Is able to get good decodes? Randy - N2CUA

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CSV data file question
by James Luhn 29 Aug '11

29 Aug '11

I am running ARISSatTLM software to receive the data from the ARISSat-1 satellite. I have seen several mentioning sending .csv files with data. Is the ARISSatTLM capable of generating a .csv data file? Perhaps a cut and paste of the data is done. I have used print screen to capture what I have recorded. Is there a much better way to record the data? I feel like I have missed something somewhere. At first I did not have much success receiving the data. I think I was trying too hard. One day I was getting disgusted with it all and just did nothing, no tuning, no nothing. I received 9 frames of data perfectly. Once again the philosophy of "if it don't stink, don't stir" applies. This satellite has added many hours of fun to my amateur radio hobby. 73, -James, W5AOO

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Re: ARISSat-1 battery
by Fabio Azzarello 29 Aug '11

29 Aug '11

Hi all, what about the following link? http://www.nrel.gov/features/20100708_battery.html 73s Fabio IW8QKU/5 *Subject: [amsat-bb] ARISSat-1 battery From: g0mrf@xxxxxxx Date: Mon, 29 Aug 2011 08:50:45 -0400 (EDT) Hi all. The ARISSat team seem to have reached the conclusion that the Silver Zinc battery technology is not really suited for an orbiting satellite with a 55 / 35 minute charge and discharge cycle. I wonder if a couple of small Lithium polymer battery packs would be a suitable replacement for ARISSat-2 ? I note that there are safety issues with Li-ion technology, but there are some small battery packs of 10Whr / 20Whr 30Whr modules which have NASA approval for manned space flight. >From the odd snippet of information on the power required during eclipse (is it 7 Watts for 35 minutes) it looks like 20-25% depth of discharge for the 20Whr battery pack. That's probably OK for a 9 month mission ?? Thanks David G0MRF http://www.clyde-space.com/documents/1902*

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