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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/4ITZINCJLDLZ7ZN6F6YI3RVHWBJLJZFD/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "[email protected]",
    "message_id_hash": "4ITZINCJLDLZ7ZN6F6YI3RVHWBJLJZFD",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/4ITZINCJLDLZ7ZN6F6YI3RVHWBJLJZFD/",
    "sender": {
        "address": "K4FEG (a) K4FEG.COM",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "K4FEG",
    "subject": "[amsat-bb] AO7 in Mode B",
    "date": "2013-06-16T19:43:14Z",
    "parent": null,
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Thanks everyone!!\n\nThanks everyone for the reports on AO7 and it being in Mode B.\n\nI think it should be in Mode B for a few more weeks so Field Day should \nhave it in Mode B the entire duration of Field Day.\n\nWe are in the middle of the Eclipse Cycle, by all standard means of \ncalculating, we (the Earth), are near the furthest distance from the Sun \nand the Southern Hemisphere is quickly approaching their \"Winter\" \nEquinox (shortest daylight period of the year), so this would be the \ntime when AO7 would have the least amount of exposure to the Sun during \npasses over Antarctica. I know there are programs that will tell you \nwhen a satellite is \"in the Sun\" or not and SATPC32 seems to do a better \nthan average job of predicting when an eclipse period is occurring.\n\nThere have been questions as to whether or not a program like SATPC32 is \ncalculating the solar position based on ground track or actual satellite \nposition in orbit, I have not reached out to find out the method of \ncalculations but based on how AO7 has reacted to even the briefest of \neclipse's as predicted by SATPC32, I suspect the relationship of the \nsatellite to the Sun is being predicted based on the actual satellite \nposition in orbit and not based on ground track. When AO7 first started \nits \"Zero Voltage Reset\" and ceased switching modes back on May 21st, \nthe eclipse period that triggered the reset was only estimated to be \nabout 15 to 20 seconds. Reports that I have received from an operator in \nNew Zealand, who has access to the satellite at times when it is heading \ninto eclipse and coming out of eclipse, has stated that the satellite \nmerely \"fades\" out and then \"fades\" back in when it comes out of the \neclipse. Based on research about the construction of AO7, it has a \nbetter than needed solar array, from that era in which it was designed \nand built, and appears to suffer no ill effects from the \"fading \nvoltage\" as the satellite loses the sunlight.\n\nIf the Eclipse Cycle holds true to the predictions and continues to \nreact as we have see it do so for the last almost 4 weeks, it should \ncontinue to do what I am calling \"Zero Voltage Reset\" until it is in \ncontinuous Sun over Antarctica, which will not occur for several more weeks.\n\nThis is one of the reasons I have been studying the reactions of AO7 \nduring this period, the way the satellite was designed gave an outline \nof how it should react coming out of eclipse, with no on-board battery \nsystem, but to my knowledge there has not been a case study, trying to \naccurately track how the satellite will react. I am just trying to \ncollect data that will help in trying to predict how the satellite may \nreact when the next Eclipse Cycle occurs. Perhaps during future eclipse \nevents we can have a much more scientific study of the \"Grand Old Lady\" \nof satellites, AO7.\n\nIf nothing else I think we can learn much from the how this satellite \nwas built and has been \"reborn\" to help serve the satellite community!\n\nMy hat is off to the design team for building one tough bird! Job Well Done!\n\nThank you everyone who sends me email updates about their observations. \nI hope I am not boring people with my current obsession of AO7, but I \nlike the old bird!\n\n73 ALL FRM,\nK4FEG\nSTARCOM DIV\nGGHQ: EM55aj84ta\n\n\n",
    "attachments": []
}