Hi Jan
Yes - that's exactly the sound I have been receiving. I tried putting in the TLE for an Orbcomm sat when Graham told me about them, and the doppler correction seemed to match. Tony Abbey (G3OVH) - 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 12:52, 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, [email protected] 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: [email protected] >> Cc: Phil Guttridge ; [email protected] >> 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 [email protected]. 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 [email protected]. 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 [email protected]. 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
