Email Detail

GET /hyperkitty/api/list/[email protected]/email/CL5YJGEWGHX35VYJ5UU544DUJICVUKEK/?format=api
HTTP 200 OK
Allow: GET, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/CL5YJGEWGHX35VYJ5UU544DUJICVUKEK/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "000001c87ca5$e7ee2090$0201a8c0@master",
    "message_id_hash": "CL5YJGEWGHX35VYJ5UU544DUJICVUKEK",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/TPPR3VANGPP6NGGZJBOWIR44UYPGCTHS/?format=api",
    "sender": {
        "address": "f.grappi (a) tin.it",
        "mailman_id": "4b7c00748d5b4cff8dcc1d00a899cb5c",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/4b7c00748d5b4cff8dcc1d00a899cb5c/emails/?format=api"
    },
    "sender_name": "Francesco Grappi",
    "subject": "[amsat-bb]  R:  Re: recent AO-40 efforts?",
    "date": "2008-03-02T20:42:17Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/REG7G2QLJUVOJWBQABBUXEHBIQPZCQ36/?format=api",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Hi Peter, \nthank you very much for the informations regarding AO-40\nand your effort on this.....fingers crossed....\n73\"\nFrank IW4DVZ\n \n\n-----Messaggio originale-----\nDa: [email protected] [mailto:[email protected]] Per conto\ndi Peter Guelzow\nInviato: domenica 2 marzo 2008 20.32\nA: [email protected]\nCc: [email protected]\nOggetto: [amsat-bb] Re: recent AO-40 efforts?\n\nHi Don and Auke,\n\n> I believe AO-40 was designed by AMSAT to not allow both sets of batteries\nto\n> be disconnected. We should have learned with AO-7 that every satellite\n> should be able to work on solar power alone as eventually all batteries\nwill\n> fail. It is my understanding that the only chance we have is if the\n> batteries burn open some day in the future.\n>   \nThis is not the problem...  you can not compare a spacecraft like AO-7 \nwith Phase 3 satellites...\n\nAO-40 would not work just from solar power and without batteries. \nThe battery works as big capacitor for the transponders. In mean, the \npower budget would be positive, but during high peak on the transponder \ndue to load, the transponder would drain current from the battery as the \npeak power would not be sufficient for the generated power from the \nsolar cells.  Without the battery, the transponder would be very \nunstable as the voltage breaks down. And even worse, the voltage break \ndown would cause the IHU (onboard computer) to make a power down reset.\nSo we could probably only have telemetry beacon, nothing else...\nDuring each eclipse pass, sometimes every orbit, the computer would also \nreset again and again.\nSince all the software must be reloaded from ground, this is a task we \ncould not provide every day.\nBut without computer, we would quickly loose orientation of the \nspacecraft and thus, the solar panelsl would quickly point away from the \nsun.. and that's is it..\nLook at AO-10 to understand what I mean..\nAO-40 was never designed to work without battery and this would also \nmake totally no sense..\nThe problem was, that the Main Battery died so quickly in a totally \ncatastrophic failure, which no one could have foreseen.\nTime for the command stations was too short to charge the Auxiliary \nBattery and do the switch over...\n\nCommand stations have tried to send command to the spacecraft since the \nbattery failure, but the rate of these attempts decreased over the last \ncouple of years.\nWe at AMSAT-DL currently plan to make a new attempt using our 20m dish \nfrom Bochum. There we would have a lot of power and very good ears too..\nHowever, I can not give an exact date when the will happen.  Also it may \nneed several weeks of attempts, since the attitude of AO-40 in regard to \nthe sun is unknown.\nIf we try at the wrong time, the solar cells may not generate any power \ndue to bad sun angle..\n\nWe will indeed keep you all informed when we do our first try to recover \nAO-40 from Bochum...\n\n73s Peter\n\nBTW:  Are there still people listening for AO-10?\n\n\n\n> -----Original Message-----\n> From: [email protected] [mailto:[email protected]] On\n> Behalf Of Auke de Jong, VE6PWN\n> Sent: Saturday, March 01, 2008 7:53 PM\n> To: AMSAT-BB\n> Subject: [amsat-bb] recent AO-40 efforts?\n>\n> I noticed that during the last period of documented efforts to recover\nAO-40\n> 4 years ago, there were promising results about hearing faint signals.  By\n> my interpretation of those old reports, they basically confirmed that the\n> command receiver was working but could not get much else done with it.\nNow\n> that it has been officially silent for several years, has anyone tried to\n> send commands to it in order to disconnect the (shorted) battery banks via\n> the relays onboard?  Given the changing sun-angles on the arrays and the\n> passage of time, as well as possible heating of certain onboard components\n> due to the constant supply of solar power to the shorted batteries, could\n> there be any possibility of (energizing) the battery-disconnect relays?  I\n> presume that they are in a fail-close arrangement, because if they were\n> fail-open, they should have already done-so due to the shunted power\nsystem.\n> Also, could the solar panels have fuses that have opened?  could such\nfuses\n> be re-settable?\n>\n> I would be interested to hear what knowledge there exists about the\npresent\n> status of AO-40, especially what \"google\" couldn't fetch.\n>\n> Auke de Jong\n> VE6PWN\n> DO33go\n> Edmonton, AB\n>\n> _______________________________________________\n> Sent via [email protected]. Opinions expressed are those of the author.\n> Not an AMSAT-NA member? Join now to support the amateur satellite program!\n> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb\n>\n>\n> _______________________________________________\n> Sent via [email protected]. Opinions expressed are those of the author.\n> Not an AMSAT-NA member? Join now to support the amateur satellite program!\n> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb\n>\n>   \n\n_______________________________________________\nSent via [email protected]. Opinions expressed are those of the author.\nNot an AMSAT-NA member? Join now to support the amateur satellite program!\nSubscription settings: http://amsat.org/mailman/listinfo/amsat-bb\n\n",
    "attachments": []
}