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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/XOVO3NBG2G7JQJYV2EM7U6GHDPV7OSUA/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "[email protected]",
    "message_id_hash": "XOVO3NBG2G7JQJYV2EM7U6GHDPV7OSUA",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/XOVO3NBG2G7JQJYV2EM7U6GHDPV7OSUA/",
    "sender": {
        "address": "rob_g8ate (a) hotmail.com",
        "mailman_id": "1248fb5843d845b19f2f3eb02c1d1f12",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/1248fb5843d845b19f2f3eb02c1d1f12/emails/"
    },
    "sender_name": "Robert Turlington",
    "subject": "[amsat-bb] Re: Delfi-C3 status update 30 April 2008 08:00 UTC",
    "date": "2008-04-30T09:51:58Z",
    "parent": null,
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "\nHi All\nI heard Delfi-c3 for about a minute ,only ,at about 0916utc this morning on 145.930+/- doppler\nlast evening it also switched off halfway through its obit just after 2000utc using a pointable 6el horiz quad and doppler tuned ft8476 in io92jp\nRegards Robert G8ATE\n\n> Date: Wed, 30 Apr 2008 10:16:58 +0200\n> From: [email protected]\n> To: [email protected]\n> CC: [email protected]\n> Subject: [amsat-bb] Delfi-C3 status update 30 April 2008 08:00 UTC\n>\n> Hi all,\n>\n> Delfi-C3 is in orbit and healthy, despite some minor issues, please find a\n> status update below:\n>\n> 1. Telemetry indicates that all solar panels and antennas have deployed\n> properly\n>\n> 2. Telemetry indicates nominal values for all housekeeping values\n>\n> 3. We have already obtained payload data, and have been able to generate IV\n> curves of the Thin Film Solar Cell experiment, note that those uring\n> RASCAL can view the IV curves by clicking Options-->show IV curves in\n> RASCAL.\n>\n> 4. The spacecraft is operating in science mode, we have had one orbit in\n> emergency mode, which was most probably due to a databus issue\n>\n> 5. Up till now we have received 7000+ (!) frames from amateurs using RASCAL\n> around the globe, amazing, thank you all so much!!\n>\n> 6. We have verified command uplink functionality yesterday, and were able to\n> command the spacecraft today on the low elevation (4.9max) pass over our GS\n> at 0737UTC\n>\n> 7. The spacecraft has decided to consistently use the backup radio on\n> 145.930MHz for its telemetry downlink, we were able to request a full\n> on-board database dump while in range of our groundstation yesterday and\n> analysis of the database confirms this. We currently have a good\n> understanding why this is the case. We will try to switch downlinks to the\n> primary radio on 145.870MHz during the next good pass over our GS, so\n> amateurs in Western Europe might want to check that frequency also and might\n> experience intermittent telemetry while we are commanding. Note that we\n> suspect that the TX frequency could be 1 to 2 kHz lower on this radio, so\n> tuning around slowly is the best strategy.\n>\n> 8. The spacecraft seems to have an issue with the downlink TX switching off\n> into the orbit, which is the reason while Delfi-C3 has not been heard on\n> most descending passes over VK/ZL, we think we have a good understanding of\n> why it is. The TX itself is fine, but it switches off automatically when it\n> does not get data from the OBC for a certain amount of time. We are working\n> on resolving this issue. This also happened during the pass over our GS at\n> 0737 UTC but we were able to command it back on. For those in Western Europe\n> we would like to ask to keep tracking Delfi-C3 even if you can not hear it\n> at first, as we will try to turn the TX back on as soon as we notice that it\n> has been turned off.\n>\n> 9. Thank you all for your observations on the spin rate, these are really\n> helpful! We currently think that the spacecraft is tumbling with approx\n> 10deg/second, which corresponds to a 36 second period. Since the s/c\n> downlink antenna is almost truely circular, polarization sense can change\n> from RHCP to LHCP completely depending on s/c orientation, we use circular\n> antennas on our GS as well, and when we switch to the opposite polarizaiton\n> sense the signal is wiped out completely, switching back gives solid copy\n> with strong sigs.\n>\n> 10. NORAD object E #32787 seems to match best\n>\n>\n> thanks for all your observations and efforts so far!\n>\n> 73 on behalf of the Delfi-C3 team,\n>\n> Wouter Jan Ubbels\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_________________________________________________________________\nBag extra points with the Walkers Brit Trip Game \nhttp://www.walkersbrittrips.co.uk/game\n",
    "attachments": []
}