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    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/GXTR4VVD4LQW6L3YBC7AS3MZMDSUU6TC/?format=api",
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    "message_id": "000801c7f7f7$23c82310$0301a8c0@Shop",
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    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/ZUIKK6HHWGNBJWT2OIKGVDLMIXGE4CZY/?format=api",
    "sender": {
        "address": "juan-rivera (a) sbcglobal.net",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "Juan Rivera",
    "subject": "[eagle] Re: Module Temperatures & Eclipse",
    "date": "2007-09-16T00:18:39Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/ZUIKK6HHWGNBJWT2OIKGVDLMIXGE4CZY/?format=api",
    "children": [],
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    "content": "Hi Dick,\n\n \n\nThanks for the information.  As you know, the SAW filters are rated for a\nminimum operating temperature of -35C and storage of -40C.  We might need to\nget creative and attach miniature strip heaters to those to keep them warm.\nAs soon as John gets his IF test board running and tuned up I want to do a\ntemp run to see how they behave over temperature.  They appear to be very\ntouchy in terms of matching.  The matching appears to be the cause of the\npassband ripple we’ve been fighting.  With luck we’ll have some information\nto share at the symposium…\n\n \n\n73,\n\n \n\nJuan\n\n \n\n  _____  \n\nFrom: [email protected] [mailto:[email protected]] On Behalf Of\nDick Jansson-rr\nSent: Saturday, September 15, 2007 1:17 PM\nTo: AMSAT Eagle \nSubject: [eagle] Module Temperatures & Eclipse\n\n \n\nJohn, Juan, Bob D., & Bob M.:\n\n \n\nI have been preparing for my presentation to the Space Symposium on the\nsubject of internal module heat sinks. As a concurrent subject, not in my\npaper, I have been preparing to discuss the temperatures that modules can\nachieve during a solar eclipse of the Eagle satellite. In this vein, things\ndo get interesting and pretty darned chilly. I am showing the outboard,\ndeployed solar panels getting down to the -117°C to -125°C! I also show\nbody-mounted solar panels getting down to -81°C and other body sheet metal\nin the -60°C range.\n\n \n\nThis analytic effort has pretty heavily exercised this new, high speed\ncomputer with some runs taking from 40 to 70 minutes, that is a lot of\nnumber crunching!\n\n \n\nThe spaceframe temperatures for the start of the analysis was set at +10°C\nand modules at +20°C.\n\n \n\nFor the modules I have analyzed both power off and with modest power\ndissipation in some modules. Some modules, with the necessary coatings to be\nable to handle 3.5W dissipation (e.eg. the URx in full operation), show a\nconsiderably deeper cooling than those with only the lowest emittance of a\nlow-power module. Unpowered, or those with very low dissipation, show\ntemperatures near to zero Celsius after three hours of eclipse while those\nof the higher emittance, for higher power operation, can get down to -30° to\n-38°C in that same time. This clearly illustrates why I have been pushing,\nwherever possible, to keep the module emittance low and to keep the module\nthermally decoupled from the spacecraft to the greatest extent possible. It\nalso reinforces my high degree of upset with our German friends who painted\nnot only the inside of their P3E modules black, but did me a “favor” by\npainting the outside black as well, failing to follow my instructions. The\nP3E situation will have to be dealt with as another issue.\n\n \n\nIn eclipse, modules with low emittance and modest power dissipation show\ntemperatures of +10° to +20°C. But the modules with the necessarily higher\nemittances, and dissipating a modest 1.0W of power, are only 10°C warmer\nthan the unpowered condition, running at -25° to -28°C.\n\n \n\nI need to further refine this analytic model and to try different power\ndissipation situations. I felt, however, that it was necessary for me to\nreport the results of these analyses to you at this time. These results are\nin line with the AO-10 telemetry for an eclipse condition, that was reported\nto me many years ago.\n\n \n\n’73,\n\nDick Jansson, KD1K\n\[email protected] \n\[email protected] \n\n \n\n\n\n",
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