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{ "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/5NB3GE7TLWZZO63DH7WO3TD7IMUVPDH4/", "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/", "message_id": "[email protected]", "message_id_hash": "5NB3GE7TLWZZO63DH7WO3TD7IMUVPDH4", "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/HJMBUACI76CR6J42TUK2EC77JEF5KNQ6/", "sender": { "address": "rjad (a) mssl.ucl.ac.uk", "mailman_id": null, "emails": null }, "sender_name": "Roger Duthie", "subject": "[amsat-bb] Re: [Re: Prospero] Commanding Error", "date": "2011-10-27T15:17:17Z", "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/IWF6DOQEVOXXEF7NSUHX4O2HLDQTVFAW/", "children": [ "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/ROWBK7KEYMKI5YTND527GVOJUC4QFZOT/" ], "votes": { "likes": 0, "dislikes": 0, "status": "neutral" }, "content": "We're hearing these 'chuff-chuff swooshes' too, though at times when our \nsoftware is not showing Orbcomm over our horizon. Our TLEs may be \nslightly out-of-date, though I think it would be a marginal thing. Can \nit be definitely confirmed that these noises are Orbcomm?\n\n- Rr.\n\nTony Abbey wrote:\n> Nothing heard from Prospero here in Leicester, that pass just finished \n> (at 14:57Z)\n> Just the Orbcomm swooshes.\n>\n> Tony Abbey - Senior Research Fellow (retired)\n> Space Research Centre\n> Dept of Physics and Astronomy\n> University of Leicester\n> University Road SRC Web page: http://www.src.le.ac.uk \n> LEICESTER LE1 7RH, United Kingdom\n>\n>\n>\n>\n>\n> On 27 Oct 2011, at 13:33, Roger Duthie wrote:\n>\n>> Well, we're hearing something like that. Though we hear this a lot, \n>> we also wonder whether we''re seeing an envelope during the Prospero \n>> pass times. \n>>\n>> The passes for today (BST) [from Heavens-Above]:\n>> 27 Oct \n>> <http://www.heavens-above.com/Gtrack.aspx?Session=kebgfdallldcgimjaonedkpf&satid=5580&date=40843.617613831> \n>> \t7.2 \t15:42:26 \t10 \tS \t15:49:21 \t77 \tE \t15:57:21 \t10 \tNNE\n>> 27 Oct \n>> <http://www.heavens-above.com/Gtrack.aspx?Session=kebgfdallldcgimjaonedkpf&satid=5580&date=40843.6908054167> \n>> \t8.7 \t17:28:31 \t10 \tWSW \t17:34:45 \t31 \tWNW \t17:41:39 \t10 \tN\n>>\n>>\n>> Also, I've started a Twitter hashtag for anyone using this mode of \n>> communication: #Prospero40 Add this to any Twitter messages you \n>> might write about Prospero or related subjects.\n>>\n>> -Roger\n>>\n>> PE0SAT wrote:\n>>> Hi,\n>>>\n>>> I have a spectrogram and a recording of that \"chuff chuff\" on\n>>> http://www.pe0sat.vgnet.nl/satellite/sat-history/prospero/\n>>>\n>>> Is it the same you guys heard?\n>>>\n>>> 73 Jan PE0SAT\n>>>\n>>>\n>>> On Thu, October 27, 2011 10:04, [email protected] wrote:\n>>> \n>>>> Hi Tony,\n>>>>\n>>>> The chuff chuff noises are from space...they are a sort of beacon carried\n>>>> on\n>>>> every Orbcomm satellite. They are 125msec long pulses of 57.6kb data and\n>>>> have a bandwidth of around 50kHz. They are quite distinctive when you only\n>>>> hear one at a time but sometimes one can hear two or more signals at the\n>>>> same time and that sort of changes the sound:)\n>>>>\n>>>> 73\n>>>>\n>>>> Graham\n>>>> G3VZV\n>>>>\n>>>> -----Original Message-----\n>>>> From: Tony Abbey\n>>>> Sent: Wednesday, October 26, 2011 8:56 PM\n>>>> To: [email protected]\n>>>> Cc: Phil Guttridge ; [email protected]\n>>>> Subject: [amsat-bb] Re: [Re: Prospero] Commanding Error\n>>>>\n>>>> Hi Roger\n>>>>\n>>>> Nothing other than the chuff- chuff on the 1600 pass. And as you said, its\n>>>> also there with Prospero over the horizon. I 'm not using a beam presently\n>>>> -\n>>>> using a 360deg parasitic Lindenblad for circular polarisation, but it is\n>>>> susceptible to all the high power pager stuff nearby. Its just strange\n>>>> that\n>>>> there are elements shifting in frequency in the chuff chuff like a signal\n>>>> from a real satellite.\n>>>> Have just come back from a Rosat re-entry celebration!\n>>>>\n>>>> Tony Abbey - Senior Research Fellow (retired)\n>>>> Space Research Centre\n>>>> Dept of Physics and Astronomy\n>>>> University of Leicester\n>>>> University Road SRC Web page: http://www.src.le.ac.uk\n>>>> LEICESTER LE1 7RH, United Kingdom\n>>>>\n>>>>\n>>>>\n>>>>\n>>>>\n>>>> On 26 Oct 2011, at 16:17, Roger Duthie wrote:\n>>>>\n>>>> \n>>>>> Tony -\n>>>>>\n>>>>> We heard something intriguing after about 14:43:40 UT as the tracking\n>>>>> said\n>>>>> the satellite was on it's way off to the north pole.\n>>>>>\n>>>>> The 'chuff-chuff' description reminds me of a sound we seem to hear\n>>>>> quite\n>>>>> a lot. Quite often it coincides with a pass, though I think we hear the\n>>>>> same (or very similar) during times when Prospero is over the horizon.\n>>>>>\n>>>>> We are going to try the next pass at ~16:00UT if you want to listen in\n>>>>> again. Our new ploy is to wait for the last most opportune moment to\n>>>>> command, as the power _may_ be at it highest (longest charging of\n>>>>> batteries, potentially). So, we'll do short commanding at above 30o el,\n>>>>> and listen.\n>>>>>\n>>>>> -Rr.\n>>>>>\n>>>>> Tony Abbey wrote:\n>>>>> \n>>>>>> Hi Roger\n>>>>>>\n>>>>>> I could hear some \"chuff-chuff\" noises on the last pass and they show a\n>>>>>> related doppler shift (although I am not correcting sufficiently) as\n>>>>>> you\n>>>>>> can see in the attached plot. Maybe its some other noise but you never\n>>>>>> know.\n>>>>>>\n>>>>>> On 26 Oct 2011, at 13:39, Roger Duthie wrote:\n>>>>>> \n>>>>>>> Commanding went well, from as far as we could make out. We're not\n>>>>>>> sure\n>>>>>>> if we're getting anything back, however.\n>>>>>>>\n>>>>>>> We'll be doing this pass today, hopefully:\n>>>>>>>\n>>>>>>> 26 Oct 7.3 15:31:43 10 S 15:38:26 60 E 15:46:11 10 NNE [Times in BST =\n>>>>>>> UTC + 1]\n>>>>>>>\n>>>>>>> -Roger\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>>>> 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>>>\n>>> \n>>\n>> -- \n>> ---\n>> Roger J A Duthie\n>> PhD Candidate\n>> Plasma Group\n>> Department of Space & Climate Physics\n>> UCL, London\n>>\n>> w: +44(0)1483 204 100 ext 2299\n>> m: +44(0)7938 55 70 44\n>> \n>\n\n-- \n---\nRoger J A Duthie\nPhD Candidate\nPlasma Group\nDepartment of Space & Climate Physics\nUCL, London\n\nw: +44(0)1483 204 100 ext 2299\nm: +44(0)7938 55 70 44\n\n\n\n", "attachments": [] }