April 2007 - Eagle (INACTIVE) - mailman.amsat.org

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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Dayton presentation
by Jim Sanford 11 Apr '07

11 Apr '07

All: I need to draft my Dayton presentation. I need input. I'm well plugged in to what the UHF receiver folks are doing (need photos). I have an idea of what's going on with the lab in MD (need photos). I desperately need info on power system experiements and progress, ACP progress, propulsion system progress, structure/thermal progress, V-band TX progress and SDX progress. Photsos would be a PLUS! I'm aware of sensor/GNC plans, would like an update on progress. I have a bunch of travel coming up for the Day Job, so will be a bit less accessible, tho will have time in hotel rooms to quietly work AMSAT things. I need your updates, photos, and other informations _/*SOONEST*/_. Thanks & 73, Jim wb4gcs(a)amsat.org

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Major Eagle events
by Jim Sanford 11 Apr '07

11 Apr '07

All: I send this separate note to advise you of some major developments with Eagle. Many of you are already aware of them, but in case I missed someone, I send this separate update. Two nights ago, I authorized expenditure of funds for purchase of components and construction of four prototypes of the UHF receiver designed by John Stephenson, KD6OZH. The boards will be distributed as follows: one to Juan Rivera, WA6HTP, for Acceptance Testing followed by limited vacuum and thermal testing one to be demonstrated at Dayton one to the SDX folks for their development one to be put through the ATP either here by me, or wherever anyone else wants to evaluate. This will then become available as needed for demonstrations or SDX development Events leading to this decision: Design by John and Peer review Development of ATP by Juan and peer review Assembly of a procurement, construction, and test team of Project Oscar members under Juan's leadership PCBoard layout by John. Peer review of schematic to board correlation in progress Development of costed Bill of Materials (BOM) by the Project Oscar team. This was a LOT of work, and actually resulted in some tweaks to design and component selection Peer review of the BOM in progress I have authorized $4100 for this effort. A small fraction of this cost includes consumables for surface mount construction and some assembly tools which will become AMSAT property and will be used again. AMSAT costs were reduced by a significant amount of "scrounging." I submitted some of this information for publication in ANS, but don't yet know if I was ahead of the deadline or not.. If I was late, I hope it will appear next week. This seems to me a huge step. We have completed one design cycle on one component and are now about to transition, for that one component, from the concept exploration/definition phase into construction of hardware. Prototype hardware, yes, but we will soon have some real test results and something real to show. The short list above belies a whole lot of work by a whole lot of folks, alll of whom I thank. Many of you participated in the earlier reviews of John's design and Juan's ATP. The near-frantic effort over the last few weeks by John and the Project Oscar folks (many of whom I'm just getting to know through various emails and echolink conferences) has been intense. As we progress with procurement and construction, I will receive and share progress updates as major milestones are met. The documents mentioned above are not all on EaglePedia yet, but will be. In particular, one unexpected fallout of the recent efforts is a BOM which may be a good template for other teams to use. It certainly made it easy for me to see and understand, "how many, how much?" Thank you all. Very 73, Jim wb4gcs(a)amsat.org

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TeamSpeak tonight
by Jim Sanford 10 Apr '07

10 Apr '07

Team: I had no opportunity last week, nor last night, to even THINK about an agenda. Might be informative to discuss the UHF receiver goings on. In case anyone wants to get on and just chat, I'll be there at 9pm eastern, 6pm pacific. Thanks & 73, Jim wb4gcs(a)amsat.org

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Re: Eagle Microwave Antenna Arrays -- mechanical concepts
by Tom Clark, K3IO 02 Apr '07

02 Apr '07

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Urgent need for peer review
by Jim Sanford 01 Apr '07

01 Apr '07

Team: Juan rivera needs someone to peer review the correlation between UHF receiver schematic and the about-to-be ordered PCB layout. All info is available as .pdf so no fancy software etc. is required. Just a couple of hours to do some checking before we commit to production. Those who have been working on it are too close to it and need assistance from an independent observer.. If you can helpout, please contact Juan directly. juan-rivera(a)sbcglobal.net Thanks & 73, Jim wb4gcs(a)amsat.org

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