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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/JW2WLEV2ZHUJX3UQZD2VPJTAZV4BAO4D/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "[email protected]",
    "message_id_hash": "JW2WLEV2ZHUJX3UQZD2VPJTAZV4BAO4D",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/VTBORMUZG2NHCIPMBMV573FOTIGBL2NM/",
    "sender": {
        "address": "zl2cia (a) paradise.net.nz",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "Sil - ZL2CIA",
    "subject": "[amsat-bb] Re: AO-07 healthy CW",
    "date": "2006-11-28T08:16:13Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/MPQFGLHO35QZKKGRQQE5SB6YASIAI2UR/",
    "children": [
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/2SX5NNBUAUOH2P5NHMAB3MSYAPCFSTXV/"
    ],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Tom,\n\nThanks. It's a great story and it's rather odd to think that two cells\nin that battery were launched into orbit with the rest, but were nothing\nmore than packing (expensive packing too).\n\nPerhaps the special merit of the \"NASA\" cells, over those selected by\nthe \"Kayser\" process, is that the NASA were designed to go open circuit\nafter 25 years in space (hi hi). However, while the commonly held view\nis that the satellite started working again because the battery became\n\"open circuit\", the telemetry suggests that it is not, so the real cause\nmay be far more subtle.\n\nThere are some very fine wires coming out of the thermally conductive\ngoo that holds the thermistor to cell no 5. Were these joined to the\nyellow and grey wires that disappear under the battery?\n\nI guess there's a special \"satellite design\" reason that double wires\nare used (instead of one thicker one) for the current carrying battery\nleads?\n\nLeaving aside Geoff's (vk2tfg) point that the telemetry may be\nirrelevant because of the doggy value in channel 6D, it would seem that\nthe five top cells (between half volt point and +12V - numbers 2,3,4,5,6\ncounting clockwise) are being charged with a current of 80mA and have\nreached a terminal voltage of 6.4 volts (8.8 - 2.4). This represents a\nvoltage of 1.28 per cell (6.4/5) and is thoroughly reasonable. This idea\nis supported by the temperature of cell number 5 at 60.28 C.\n\nThe five cells between the half voltage point and ground are not so\nhealthy.  The figure of 2.4 volts suggest that 3 of them are short\ncircuited.\n\nOf course anything could be happening. The whole box could be a morass\nof goo with leakage currents going everywhere.\n\nI will try and capture some more telemetry myself, as soon as the house\npainting is finished and I can remount my satellite antennas..\n\nGeoff,\n\nYou made a comment:\n\"Check channel 6D, anything other than about 0.5 means that the others\nare likely to be dodgy (invalid)\".\n\nCan you tell me any more about this. How is the value should in channel\n6D derived?\n\nBoy, a circuit diagram would be a diagnostic great tool here.\n\nSil - ZL2CIA\n\n\n\n\n\n",
    "attachments": []
}