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{ "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/47VYNNBJSUULMP4K7CXSELYSAPSVVZRT/?format=api", "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api", "message_id": "[email protected]", "message_id_hash": "47VYNNBJSUULMP4K7CXSELYSAPSVVZRT", "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/JELMZYQ4H7LHRQXG74PW5HRJJ5OPPCCL/?format=api", "sender": { "address": "bill (a) hsmicrowave.com", "mailman_id": "d7ecbf0c1df148f289f27dd7a8c37974", "emails": "https://mailman.amsat.org/hyperkitty/api/sender/d7ecbf0c1df148f289f27dd7a8c37974/emails/?format=api" }, "sender_name": "Bill Ress", "subject": "[eagle] Re: 70 cm Eagle Receiver - Final Spur Report (at least fortoday...)", "date": "2007-06-17T23:23:32Z", "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/B6OVQZSWH56LNVCU5KZPR3QGWYULPKHJ/?format=api", "children": [], "votes": { "likes": 0, "dislikes": 0, "status": "neutral" }, "content": "Hi Bill,\n\nGreat to hear your response and I really look forward to your efforts. I \nknow we'll all benefit by being able to design our modules with a better \nchance of first time success.\n\nI'm not sure if or how I could contribute (maybe breadboarding or \ntesting something), but you have my support.\n\nRegards...Bill - N6GHz\n\nBill Tynan wrote:\n> Right On Juan:\n> Here is where an interface document is a nesessity. That's what I told \n> Jim I would undertake. But, I have been out of the Eagle loop for \n> months and thus didn't know that such issues were now coming up.\n> An interface document should spell out power, including power quality, \n> not mere pin connections and physical fit data.\n> I have a lot of catching up to do but will need a lot of help to get \n> started.\n> 73,\n> Bill Tynan, W3XO\n>\n> ----- Original Message -----\n> *From:* Juan Rivera <mailto:[email protected]>\n> *To:* 'Bdale Garbee' <mailto:[email protected]>\n> *Cc:* 'David Smith' <mailto:[email protected]> ; 'Dave Black (Work)'\n> <mailto:[email protected]> ; 'Dave Black (Home)'\n> <mailto:[email protected]> ; [email protected]\n> <mailto:[email protected]> ; 'Samsonoff@Mac. Com'\n> <mailto:%27Samsonoff@Mac.%20Com%27> ; 'Juan.Rivera (Work)'\n> <mailto:[email protected]>\n> *Sent:* Sunday, June 17, 2007 12:58 PM\n> *Subject:* [eagle] Re: 70 cm Eagle Receiver - Final Spur Report\n> (at least fortoday...)\n>\n> Bdale,\n>\n> I certainly wouldn't suggest that no one in AMSAT understands\n> power distribution. I just can't find any detailed requirements.\n> What I have found was a spreadsheet (click here\n> <http://www.amsat.org/amsat-new/eagle/EaglePedia/uploads/1/14/Wiring.xls>)\n> that lays out all of Eagle’s wiring. There is no mention of\n> shielding or twisted pairs for the power. Both are important to\n> reduce radiated noise.\n>\n> As a newcomer I am wary of aural tradition and informal meetings\n> as good tools for development of complex systems. I think\n> everything needs to be written down in unambiguous requirements\n> documents, starting at the top level. This current exercise with\n> the 70 cm receiver is a good test of the current processes and\n> procedures.\n>\n> I’ve glanced at John's new receiver specifications and I don’t see\n> any reference to input power or the EMI environment that the\n> receiver must work in. How can it be designed or tested if that\n> environment has not been specified as a requirement? It’s not\n> John’s fault. He has nothing to base it on. That’s where the top\n> level requirements would give him something to work with.\n> Everything needs to start at the top and work down. Not from the\n> bottom up.\n>\n> 73,\n>\n> Juan\n>\n> -----Original Message-----\n> From: Bdale Garbee [mailto:[email protected]]\n> Sent: Sunday, June 17, 2007 10:04 AM\n> To: [email protected]\n> Cc: [email protected]; David Smith; Dave Black (Work); Dave Black\n> (Home); Samsonoff@Mac. Com; Juan.Rivera (Work)\n> Subject: Re: [eagle] 70 cm Eagle Receiver - Final Spur Report (at\n> least fortoday...)\n>\n> On Sun, 2007-06-17 at 08:48 -0700, Juan Rivera wrote:\n>\n> > I've completed my testing and analysis of the spurs that appeared in\n>\n> > the IF output of the 70 cm Eagle Receiver prototype. I believe I know\n>\n> > the source and the cause of all of them and how they can be\n> eliminated\n>\n> > or rendered harmless.\n>\n> Nice work.\n>\n> Reading your report, two things strike me, neither of which I consider\n>\n> myself an expert on in AMSAT or elsewhere, but both of which I'll\n>\n> mention to help motivate the review of power system requirements you\n>\n> clearly hope comes next/soon.\n>\n> The first is that I think AMSAT does understand most if not all of the\n>\n> issues you're warning against regarding DC distributiong wiring. Some\n>\n> care was taken, for example, in planning pinouts of the 15-pin\n> connector\n>\n> on the spacecraft bus side of the CAN-Do! widget, and in the proposed\n>\n> wiring harness design from the Black Forest meeting.\n>\n> The second is that I think more work is going to be required to ensure\n>\n> receivers behave reasonably in the presence of supply noise. For\n>\n> various reasons, as others have already alluded, I wouldn't count\n> on the\n>\n> Eagle power bus being very quiet.\n>\n> Bdale, from Edinburgh\n>\n> ------------------------------------------------------------------------\n> _______________________________________________\n> Via the Eagle mailing list courtesy of AMSAT-NA\n> [email protected]\n> http://amsat.org/mailman/listinfo/eagle\n>\n> ------------------------------------------------------------------------\n>\n> _______________________________________________\n> Via the Eagle mailing list courtesy of AMSAT-NA\n> [email protected]\n> http://amsat.org/mailman/listinfo/eagle\n> \n\n", "attachments": [] }