- Eagle (INACTIVE) - mailman.amsat.org

TeamSpeak conference tonight
by Jim Sanford 09 May '07

09 May '07

All: My apologies for not sending out an agenda sooner. To be honest, with all that's been going on here, and following the U-band RX work, it slipped my mind. Anybody who wants to show up at 2100 EDT, 1800 PDT, please do, and discuss whatever. I have a township planning commission meeting in 30 minutes and might be a few minutes late. I will check in as soon as I can, and will be prepared to discuss U-vand RX status. (I expect Juan will NOT be able to make it.) Another topic we could discuss would be Dayton. Finally, my verizon wireless connection has been incredibly cantankerous lately, so I may not make it at all, or may drop out. IF so, press on without me. Thanks & 73, Jijm wb4gcs(a)amsat.org

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1/2 Scale model at Space Day
by Robert McGwier 08 May '07

08 May '07

http://n4hy.smugmug.com/gallery/2819832/1/150794625#150796886 Those are Jansson's modules on top (with the other clutter). One is a standard module. The other is a cut away of a heat sink module. Bob -- AMSAT Director and VP Engineering. Member: ARRL, AMSAT-DL, TAPR, Packrats, NJQRP, QRP ARCI, QCWA, FRC. ARRL SDR WG Chair "If you're going to be crazy, you have to get paid for it or else you're going to be locked up." Hunter S. Thompson

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a stress break for the UHF receiver team... ;-)
by Bdale Garbee 07 May '07

07 May '07

http://www.xkcd.com/c227.html

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Travels
by Dick Jansson-rr 07 May '07

07 May '07

I will be on the road from 07 to 14 May and will not have ready access to the computer. If there is an immediate need for my services please call me on my cell: 407-810-3359. '73, Dick Jansson, KD1K <mailto:kd1k@amsat.org> kd1k(a)amsat.org <mailto:kd1k@arrl.net> kd1k(a)arrl.net ---------------------------

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Eagle model
by Robert McGwier 06 May '07

06 May '07

Yesterday at Space Day at the Air and Space Museum (D.C.) , Bob Davis revealed the Eagle structure 1/2 scale model. I will put up pictures later to give everyone a look. It is a very nice look. I have neglected to post my remarks on Dick Jansson's module designs. I have had a regular module and a cut away of the heat sink module. This is very fine work. My final remarks on the work will await Bob Davis and Jim Sanford and I looking at this together. But at this time, I see no reason at this time for us not to accept these modules and to thank Dick for his fine work. Bob Davis has the modules now. Next, we are doing more detailed work on the energy requirements of the spacecraft. We have very short periods of eclipses and while the angled arrays do a great job of mitigating off pointing angle, NOTHING can mitigate no sun at all! Given the amount of energy storage required to live through these eclipses, it is my OPINION that we are going to have to compromise on the periods of eclipse and TURN SOMETHING OFF. The amount of solar panel and battery storage required to keep everything alive through these eclipses, upon more detailed study, seems exhorbitant in terms of cost, weight, etc. Lou, Bob Davis, and I have discussed this and Lou and Bob both have very nice study tools. We need to write up a report on this for everyone to take into account. Juan Rivera and company have made great progress on the Stephensen 70cm RX recently. They are really doing a fantastic job. More will follow from them but it is good news. We will be doing dynamics testing, noise testing, etc. soon! 73's Bob N4HY -- AMSAT Director and VP Engineering. Member: ARRL, AMSAT-DL, TAPR, Packrats, NJQRP, QRP ARCI, QCWA, FRC. ARRL SDR WG Chair "If you're going to be crazy, you have to get paid for it or else you're going to be locked up." Hunter S. Thompson

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FWD: Eagle Update - Discussion of Plastic versus Military parts]
by Jim Sanford 30 Apr '07

30 Apr '07

All: Info. A little history on our off-and-on discussion about what kind of parts to fly. I have responded regarding his volunteering. 73, Jim wb4gcs(a)amsat.org -------- Original Message -------- Subject: Eagle Update - Discussion of Plastic versus Military parts Date: Mon, 30 Apr 2007 19:17:39 -0400 From: Daniel Kekez <va3kkz(a)amsat.org> To: wb4gcs(a)amsat.org Hi Jim, I read your recent Eagle Update in the AMSAT journal, and I found it interesting that you were having the Plastic versus Military parts discussion. I work at the Space Flight Lab at the University of Toronto, and we were trained by AMSAT almost a decade ago on the Microspace way. And part of that has been the careful selection of plastic parts in conjunction with intelligent designs. This combination has proved to be quite successful on the MOST microsatellite. On the other hand, I've also wondered about the suitability of COTS components for a HEO mission like Eagle which will pass through the radiation belts twice per orbit. So I'm quite curious to hear the details. I am wondering if the discussion you describe took place on a mailing list or some other forum to which I could subscribe. Now, since there is no such thing as a free lunch :), I have to ask what work I should contribute to get "in the loop". I don't have a lot of free time, given the demands of my job, but I could be of use in the immediate with digital electronics or software type of work. Anyway, please let me know. 73, -Daniel, VA3KKZ

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Another idea on phased array configuration
by Tom Clark, K3IO 29 Apr '07

29 Apr '07

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Module Heat Sink
by Dick Jansson-rr 27 Apr '07

27 Apr '07

I have posted in the Eaglepedia>Eagle>Mechanical the specialized E05 50 & E16 10 drawings for the U Band receiver thermal control methods using localized heat sinks to cool the several high power density areas of the module PCB by conduction to the module base plate. These drawings are an indication of the methods that may need to be applied to other modules of the Eagle mission. Shortly I plan to post a note on this effort with the indications and methods applied so as to assist others in the program. with possibly similar needs. The door is open for inquiries. Dick Jansson, KD1K kd1k(a)amsat.org kd1k(a)arrl.net ---------------------------

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[Fwd: [CubeSat] Presentations online]
by Tom Clark, K3IO 23 Apr '07

23 Apr '07

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Failure analysis
by Jim Sanford 16 Apr '07

16 Apr '07

Team: I have updated the "view from the bridge" page with a link to NASA's preliminary report on the Mars Global Surveyor loss. Good read, some lessons for us. Thanks 7 73, Jim wb4gcs(a)amsat.org

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