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    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/UGZ4J56Y4HFG4HGGH3WG3SYNNSUMNZGW/?format=api",
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    "message_id": "[email protected]",
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    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/A6GZLYCUJK4PETLB2KWMOYCTJBYNDCAC/?format=api",
    "sender": {
        "address": "wb4gcs (a) amsat.org",
        "mailman_id": "87014499e012476c8198fad186f7f963",
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    },
    "sender_name": "Jim Sanford",
    "subject": "[eagle] Re: Latest 70 cm Receiver Test Results",
    "date": "2007-06-11T00:48:06Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/3ZA2AACRYVRKQC72V6UHUMUCOMSN2PW7/?format=api",
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    "content": "Dick:\nSimplisticly:\n  What have we seen and designed to in the past?  It would seem like \nthat would be a reasonable requirement for both the payload teams and \nthe thermal team.  Give the payload guys a reasonable number to start with.\n\nThanks & 73,\nJim\[email protected]\n\n\nDick Jansson-rr wrote:\n\n> By the say, are there new specs for the receiver yet?  Is it still \n> expected to cold soak to -70C?  That’s close to the temperature of \n> liquid CO2 and well below the storage temperature of most components \n> and way below the operating temperature limits.\n>\n> ------------------------------\n> Juan:\n>  \n> There has never been any plan, specification, or thought of soaking \n> any Eagle equipment to -70°C. The -70 number comes out of a very \n> dynamic cooling situation that is barely possible and probably will \n> not be allowed. This number comes from the fact that the higher power \n> modules that are not conductively coupled to the spaceframe, such as \n> are transmitters, could numerically get to the lower temperature range \n> if it is unpowered or reduced power dissipation.\n>  \n> In a protracted eclipse (~2 hour), the outer shell of the spaceframe \n> will get very cold, taking such modules as the URx down in \n> temperature. This is a highly dynamic situation that has not yet been \n> modeled, and it won't be until we have a spaceframe design on which to \n> base such a model. Medium power modules such as the URx will have to \n> have its outer cover emittance in the range of ? = 0.45 or so because \n> it will be mounted on the thermally isolated module mounting channels. \n> Very low power modules, P < 1.0W, will be able to have the very low \n> emittance of the AlClad aluminum and their lower temperatures will not \n> be below ~-20°C. It is through these means that the critical command \n> modules will not loose their functionality during eclipse, as I have \n> noted previously. These numbers are not only analytical but have been \n> confirmed by in-flight telemetry.\n>  \n> The BOE numbers go as follows:\n> If the spaceframe cools to -100°C\n> If the URx is powered to 3.5W, ? = 0.45\n> If the URx is in thermal equilibrium\n> Then the equilibrium temperature would be about -48.8°C\n>  \n> Under these same conditions, but with an E05 20 module that is P = \n> 1.0W and ? = 0.04, the equilibrium temperature would not be below 0°C. \n> (Getting and keeping a module emittance that low is not very probable \n> as there are wire lead conduction terms that affect the end result.)\n>  \n> There are too many \"if\" statements here before on which to base a \n> specification at this point in time, but these are the issues that I \n> have to deal with in trying to keep a spaceframe alive during eclipse. \n> Module designers, on the other hand, must also be prepared for these \n> kind of conditions and not expect a rosy comfortable arm chair \n> environment during eclipses. Eclipses will be a fact of life, as they \n> always have been, and I cannot make things better for you if the \n> module power dissipation needs to bring the module emittance off of \n> the bottom stop.\n>  \n> '73,\n> */Dick Jansson,/ KD1K*\n> [email protected] <mailto:[email protected]>\n> [email protected] <mailto:[email protected]>\n> ---------------------------\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\n\n",
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