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{ "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/IWF6DOQEVOXXEF7NSUHX4O2HLDQTVFAW/", "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/", "message_id": "[email protected]", "message_id_hash": "IWF6DOQEVOXXEF7NSUHX4O2HLDQTVFAW", "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/HJMBUACI76CR6J42TUK2EC77JEF5KNQ6/", "sender": { "address": "afa3 (a) leicester.ac.uk", "mailman_id": null, "emails": null }, "sender_name": "Tony Abbey", "subject": "[amsat-bb] Re: [Re: Prospero] Commanding Error", "date": "2011-10-27T15:02:03Z", "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/MCMWI2BOBP3YDAWUX323NNSWPK5P2CKR/", "children": [ "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/5NB3GE7TLWZZO63DH7WO3TD7IMUVPDH4/" ], "votes": { "likes": 0, "dislikes": 0, "status": "neutral" }, "content": "Nothing heard from Prospero here in Leicester, that pass just finished (at 14:57Z)\nJust the Orbcomm swooshes.\n\nTony Abbey - Senior Research Fellow (retired)\nSpace Research Centre\nDept of Physics and Astronomy\nUniversity of Leicester\nUniversity Road \tSRC Web page: http://www.src.le.ac.uk \nLEICESTER LE1 7RH, United Kingdom\n\n\n\n\n\nOn 27 Oct 2011, at 13:33, Roger Duthie wrote:\n\n> Well, we're hearing something like that. Though we hear this a lot, we also wonder whether we''re seeing an envelope during the Prospero pass times. \n> \n> The passes for today (BST) [from Heavens-Above]:\n> 27 Oct\t7.2\t15:42:26\t10\tS\t15:49:21\t77\tE\t15:57:21\t10\tNNE\n> 27 Oct\t8.7\t17:28:31\t10\tWSW\t17:34:45\t31\tWNW\t17:41:39\t10\tN\n> Also, I've started a Twitter hashtag for anyone using this mode of communication: #Prospero40 Add this to any Twitter messages you might write about Prospero or related subjects.\n> \n> -Roger\n> \n> PE0SAT wrote:\n>> \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", "attachments": [] }