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 > -- With regards Jan H. van Gils Internet web-page http://www.VGNet.NL/ Internet e-mail address JanVG[at]VGNet.NL _______________________________________________ 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
