Nothing heard from Prospero here in Leicester, that pass just finished (at 14:57Z) Just the Orbcomm swooshes.
Tony Abbey - Senior Research Fellow (retired) Space Research Centre Dept of Physics and Astronomy University of Leicester University Road SRC Web page: http://www.src.le.ac.uk LEICESTER LE1 7RH, United Kingdom On 27 Oct 2011, at 13:33, Roger Duthie wrote: > 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. > > The passes for today (BST) [from Heavens-Above]: > 27 Oct 7.2 15:42:26 10 S 15:49:21 77 > E 15:57:21 10 NNE > 27 Oct 8.7 17:28:31 10 WSW 17:34:45 31 > WNW 17:41:39 10 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. > > -Roger > > PE0SAT wrote: >> >> Hi, >> >> I have a spectrogram and a recording of that "chuff chuff" on >> http://www.pe0sat.vgnet.nl/satellite/sat-history/prospero/ >> >> Is it the same you guys heard? >> >> 73 Jan PE0SAT >> >> >> On Thu, October 27, 2011 10:04, g.shirvi...@btinternet.com wrote: >> >>> Hi Tony, >>> >>> The chuff chuff noises are from space...they are a sort of beacon carried >>> on >>> every Orbcomm satellite. They are 125msec long pulses of 57.6kb data and >>> have a bandwidth of around 50kHz. They are quite distinctive when you only >>> hear one at a time but sometimes one can hear two or more signals at the >>> same time and that sort of changes the sound:) >>> >>> 73 >>> >>> Graham >>> G3VZV >>> >>> -----Original Message----- >>> From: Tony Abbey >>> Sent: Wednesday, October 26, 2011 8:56 PM >>> To: r...@mssl.ucl.ac.uk >>> Cc: Phil Guttridge ; amsat-bb@amsat.org >>> Subject: [amsat-bb] Re: [Re: Prospero] Commanding Error >>> >>> Hi Roger >>> >>> Nothing other than the chuff- chuff on the 1600 pass. And as you said, its >>> also there with Prospero over the horizon. I 'm not using a beam presently >>> - >>> using a 360deg parasitic Lindenblad for circular polarisation, but it is >>> susceptible to all the high power pager stuff nearby. Its just strange >>> that >>> there are elements shifting in frequency in the chuff chuff like a signal >>> from a real satellite. >>> Have just come back from a Rosat re-entry celebration! >>> >>> Tony Abbey - Senior Research Fellow (retired) >>> Space Research Centre >>> Dept of Physics and Astronomy >>> University of Leicester >>> University Road SRC Web page: http://www.src.le.ac.uk >>> LEICESTER LE1 7RH, United Kingdom >>> >>> >>> >>> >>> >>> On 26 Oct 2011, at 16:17, Roger Duthie wrote: >>> >>> >>>> Tony - >>>> >>>> We heard something intriguing after about 14:43:40 UT as the tracking >>>> said >>>> the satellite was on it's way off to the north pole. >>>> >>>> The 'chuff-chuff' description reminds me of a sound we seem to hear >>>> quite >>>> a lot. Quite often it coincides with a pass, though I think we hear the >>>> same (or very similar) during times when Prospero is over the horizon. >>>> >>>> We are going to try the next pass at ~16:00UT if you want to listen in >>>> again. Our new ploy is to wait for the last most opportune moment to >>>> command, as the power _may_ be at it highest (longest charging of >>>> batteries, potentially). So, we'll do short commanding at above 30o el, >>>> and listen. >>>> >>>> -Rr. >>>> >>>> Tony Abbey wrote: >>>> >>>>> Hi Roger >>>>> >>>>> I could hear some "chuff-chuff" noises on the last pass and they show a >>>>> related doppler shift (although I am not correcting sufficiently) as >>>>> you >>>>> can see in the attached plot. Maybe its some other noise but you never >>>>> know. >>>>> >>>>> On 26 Oct 2011, at 13:39, Roger Duthie wrote: >>>>> >>>>>> Commanding went well, from as far as we could make out. We're not >>>>>> sure >>>>>> if we're getting anything back, however. >>>>>> >>>>>> We'll be doing this pass today, hopefully: >>>>>> >>>>>> 26 Oct 7.3 15:31:43 10 S 15:38:26 60 E 15:46:11 10 NNE [Times in BST = >>>>>> UTC + 1] >>>>>> >>>>>> -Roger >>>>>> >>> _______________________________________________ >>> Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. >>> Not an AMSAT-NA member? Join now to support the amateur satellite program! >>> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb >>> >>> _______________________________________________ >>> Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. >>> Not an AMSAT-NA member? Join now to support the amateur satellite program! >>> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb >>> >>> >> >> >> > > -- > --- > Roger J A Duthie > PhD Candidate > Plasma Group > Department of Space & Climate Physics > UCL, London > > w: +44(0)1483 204 100 ext 2299 > m: +44(0)7938 55 70 44 _______________________________________________ Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
