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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/O5SXJCK25Z72KSSKSPLSMK5ZUKXGJMB7/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "[email protected]",
    "message_id_hash": "O5SXJCK25Z72KSSKSPLSMK5ZUKXGJMB7",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/O5SXJCK25Z72KSSKSPLSMK5ZUKXGJMB7/",
    "sender": {
        "address": "archie.hackett (a) hotmail.com",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "John Hackett",
    "subject": "[amsat-bb]  AO-7 report.",
    "date": "2007-10-17T07:24:28Z",
    "parent": null,
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "\nRegular users will have noted that the AO-7 mode-B transponder has begun to \"behave\" again.\n\nWe're still not sure 'exactly' what happened, several \"theories\" have been bandied about ... what is certain !!! is that it was a power related problem so let us concentrate on *NOT* belting her with excessive power.\n\nWhen you can't hear yourself adequately ... IMPROVE YOUR RECEIVE CAPABILITIES.\n\nCranking up your transmit power to compensate for an inadequate receiving system is *NOT* the way to go. Remember ... AO-7 is running at less than optimum in all 4 modes. Let's not accelerate her second demise by screwing up the power budget anymore than it already is.\n\nExcessive power *WILL* shorten the satellite's life. If, through lack of experience you don't understand why ... please take the trouble to find out. \n\nI read on the Internet yesterday one prominent satellite operator, a PA station, list part of his equipment as 100w and 2 x 10 element beams. He specify whether this was 100w EIRP or 100w fed to the aerials ... I most certainly hope it was *NOT* the latter since assuming a line loss of 3dB that would give an EIRP of well over 500 watts with today's compact 10 element beams ... enough to melt the plastic holding AO-7's solar panels on the spaceframe.\n\n(Yes, I'm kidding ... but 500w EIRP is 450 too many for AO-7).\n\nPlease remember, 31 years ago not all the \"bits n' pieces\" were space-rated.\n\nThree things you should improve for better AO-7 operating. \n\n1) Receive capability.\n2) Receive capability.\n3) Receive capability.\n\nAt 06:27 UTC this morning I noticed something I havn't heard for two years ... that which I presume was echos of the BMEWS radar, I was rather \"bemused\" (pun intentional). It sounded like a rapid machine-gun like auroral woodpecker ... or if you've never experienced aurora propagation, like blowing through your nose into the neck of a glass bottle ... \"keying\" it at about 65 wpm.\n\nGM1SXX and myself suspected the Fyllingsdale BMEWS radar situated on the north Yorkshire moors in the UK ... \n\nBMEWS = ballistic missile early warning system.\n\nFor a detailed description see ... \n\n <http://www.observations.biz/Joint_Observations/BMEWS_ed.htm>\n\n73 John.   <[email protected]>\n",
    "attachments": []
}