[amsat-bb] Re: [Re: Prospero] Commanding Error
Hi Roger, All understood..I have put the currently 28? active Orbcomms into Nova here and almost all of the time there is at least one above my horizon and I can hear the chuffing noises..will be listening again this evening Do you have details of the on board power system? For instance what are the batteries? If the batteries have failed short circuit will they be clamping the bus to 0volts? Can the power system work with open circuit cells? What is/was the default power up operating mode? good luck! Graham G3VZV From: Roger Duthie Sent: Friday, October 28, 2011 10:25 AM To: Tony Abbey Cc: pe0...@vgnet.nl ; g.shirvi...@btinternet.com ; Phil Guttridge ; amsat-bb@amsat.org ; g8...@ntlworld.com ; Dale Potts ; Barry Hancock ; Richard Cole ; mailto:r...@mssl.ucl.ac.uk ; Alan Smith ; Graham Kimbell (G3TCT) Subject: Re: [amsat-bb] Re: [Re: Prospero] Commanding Error OK - so that's definitely Orbcomm (from the spectrogram). Have you got audio of this? We hear a chuffing sound intermittently (ie., it comes and goes in interval of minutes), which happens when neither Orbcomm nor Prospero is reported by our software to be above the horizon (is this the pager stuff you're talking about?). We also heard another thing a couple of days ago, though we're still not 100% on what that might have been (it appeared to be fading as Prospero receded to the North - though was it an aeroplane on 137.56?). Someone yesterday has supposedly heard something that's wasn't Orbcomm during the early evening pass. We'll look into it. The pass we're going to try today (for the sake of ceremony, really) is (again, times in BST = UT + 1): 28 Oct 7.4 15:53:18 10 S 16:00:22 86 W 16:08:28 10 N - Roger m0rja Tony Abbey wrote: Hi Roger Once Graham told me the noise was Orbcomm this morning, I added the TLEs for their satellites (http://www.orbcomm.com/Collateral/Documents/English-US/o11292.tle) to my SDR Radio software satellite definitions. Here's a pass I recorded from one of them this morning, and you can see that the chuff-chuff on the left hand side has structure which is kept vertical by the doppler correction. The other crap and pager cross talk etc bends with the doppler correction. I think that proves the point. 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 -- Spectrogram removed by RJAD (might ahve been bad for the amsat-bb board) -- On 27 Oct 2011, at 16:17, Roger Duthie wrote: We're hearing these 'chuff-chuff swooshes' too, though at times when our software is not showing Orbcomm over our horizon. Our TLEs may be slightly out-of-date, though I think it would be a marginal thing. Can it be definitely confirmed that these noises are Orbcomm? - Rr. Tony Abbey wrote: 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
[amsat-bb] Re: [Re: Prospero] Commanding Error
Hi Roger The email list increases exponentially;-) I saw Jan's post with audio links. So just for completeness here's a file from the same spectrogram I posted yesterday, starting at around 09:33. The chuffs get quite loud and sometimes there's a double chuff, which I understand maybe from two Orbcomm sats. 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 28 Oct 2011, at 10:25, Roger Duthie wrote: OK - so that's definitely Orbcomm (from the spectrogram). Have you got audio of this? We hear a chuffing sound intermittently (ie., it comes and goes in interval of minutes), which happens when neither Orbcomm nor Prospero is reported by our software to be above the horizon (is this the pager stuff you're talking about?). We also heard another thing a couple of days ago, though we're still not 100% on what that might have been (it appeared to be fading as Prospero receded to the North - though was it an aeroplane on 137.56?). Someone yesterday has supposedly heard something that's wasn't Orbcomm during the early evening pass. We'll look into it. The pass we're going to try today (for the sake of ceremony, really) is (again, times in BST = UT + 1): 28 Oct7.4 15:53:1810 S 16:00:2286 W 16:08:2810 N - Roger m0rja Tony Abbey wrote: Hi Roger Once Graham told me the noise was Orbcomm this morning, I added the TLEs for their satellites (http://www.orbcomm.com/Collateral/Documents/English-US/o11292.tle) to my SDR Radio software satellite definitions. Here's a pass I recorded from one of them this morning, and you can see that the chuff-chuff on the left hand side has structure which is kept vertical by the doppler correction. The other crap and pager cross talk etc bends with the doppler correction. I think that proves the point. 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 Spectrogram removed by RJAD (might ahve been bad for the amsat-bb board) On 27 Oct 2011, at 16:17, Roger Duthie wrote: We're hearing these 'chuff-chuff swooshes' too, though at times when our software is not showing Orbcomm over our horizon. Our TLEs may be slightly out-of-date, though I think it would be a marginal thing. Can it be definitely confirmed that these noises are Orbcomm? - Rr. Tony Abbey wrote: 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 Oct7.2 15:42:2610 S 15:49:2177 E 15:57:2110 NNE 27 Oct8.7 17:28:3110 WSW 17:34:4531 WNW 17:41:3910 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
[amsat-bb] Re: [Re: Prospero] Commanding Error
Hi Roger, I think only 8 of the OrbComm satellites are on 137.56.. It sounds like it may be worth contacting OrbComm though- I'll give them a call. Dale On 28/10/2011 10:39, g.shirvi...@btinternet.com wrote: Hi Roger, All understood..I have put the currently 28? active Orbcomms into Nova here and almost all of the time there is at least one above my horizon and I can hear the chuffing noises..will be listening again this evening Do you have details of the on board power system? For instance what are the batteries? If the batteries have failed short circuit will they be clamping the bus to 0volts? Can the power system work with open circuit cells? What is/was the default power up operating mode? good luck! Graham G3VZV From: Roger Duthie Sent: Friday, October 28, 2011 10:25 AM To: Tony Abbey Cc: pe0...@vgnet.nl ; g.shirvi...@btinternet.com ; Phil Guttridge ; amsat-bb@amsat.org ; g8...@ntlworld.com ; Dale Potts ; Barry Hancock ; Richard Cole ; mailto:r...@mssl.ucl.ac.uk ; Alan Smith ; Graham Kimbell (G3TCT) Subject: Re: [amsat-bb] Re: [Re: Prospero] Commanding Error OK - so that's definitely Orbcomm (from the spectrogram). Have you got audio of this? We hear a chuffing sound intermittently (ie., it comes and goes in interval of minutes), which happens when neither Orbcomm nor Prospero is reported by our software to be above the horizon (is this the pager stuff you're talking about?). We also heard another thing a couple of days ago, though we're still not 100% on what that might have been (it appeared to be fading as Prospero receded to the North - though was it an aeroplane on 137.56?). Someone yesterday has supposedly heard something that's wasn't Orbcomm during the early evening pass. We'll look into it. The pass we're going to try today (for the sake of ceremony, really) is (again, times in BST = UT + 1): 28 Oct 7.4 15:53:18 10 S 16:00:22 86 W 16:08:28 10 N - Roger m0rja Tony Abbey wrote: Hi Roger Once Graham told me the noise was Orbcomm this morning, I added the TLEs for their satellites (http://www.orbcomm.com/Collateral/Documents/English-US/o11292.tle) to my SDR Radio software satellite definitions. Here's a pass I recorded from one of them this morning, and you can see that the chuff-chuff on the left hand side has structure which is kept vertical by the doppler correction. The other crap and pager cross talk etc bends with the doppler correction. I think that proves the point. Tony Abbey - Senior Research Fellow (retired) Space Research Centre Dept of Physics and Astronomy University of LeicesterUniversity Road SRC Web page: http://www.src.le.ac.uk LEICESTER LE1 7RH, United Kingdom Spectrogram removed by RJAD (might ahve been bad for the amsat-bb board) On 27 Oct 2011, at 16:17, Roger Duthie wrote: We're hearing these 'chuff-chuff swooshes' too, though at times when our software is not showing Orbcomm over our horizon. Our TLEs may be slightly out-of-date, though I think it would be a marginal thing. Can it be definitely confirmed that these noises are Orbcomm? - Rr. Tony Abbey wrote: 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 LeicesterUniversity 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
[amsat-bb] Re: [Re: Prospero] Commanding Error
OK - so that's definitely Orbcomm (from the spectrogram). Have you got audio of this? We hear a chuffing sound intermittently (ie., it comes and goes in interval of minutes), which happens when neither Orbcomm nor Prospero is reported by our software to be above the horizon (is this the pager stuff you're talking about?). We also heard another thing a couple of days ago, though we're still not 100% on what that might have been (it appeared to be fading as Prospero receded to the North - though was it an aeroplane on 137.56?). Someone yesterday has supposedly heard something that's wasn't Orbcomm during the early evening pass. We'll look into it. The pass we're going to try today (for the sake of ceremony, really) is (again, times in BST = UT + 1): 28 Oct http://www.heavens-above.com/Gtrack.aspx?Session=kebgfdallldcgimjaonedkpfsatid=5580date=40844.6252559144 7.4 15:53:18 10 S 16:00:22 86 W 16:08:28 10 N - Roger m0rja Tony Abbey wrote: Hi Roger Once Graham told me the noise was Orbcomm this morning, I added the TLEs for their satellites (http://www.orbcomm.com/Collateral/Documents/English-US/o11292.tle) to my SDR Radio software satellite definitions. Here's a pass I recorded from one of them this morning, and you can see that the chuff-chuff on the left hand side has structure which is kept vertical by the doppler correction. The other crap and pager cross talk etc bends with the doppler correction. I think that proves the point. 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 Spectrogram removed by RJAD (might ahve been bad for the amsat-bb board) On 27 Oct 2011, at 16:17, Roger Duthie wrote: We're hearing these 'chuff-chuff swooshes' too, though at times when our software is not showing Orbcomm over our horizon. Our TLEs may be slightly out-of-date, though I think it would be a marginal thing. Can it be definitely confirmed that these noises are Orbcomm? - Rr. Tony Abbey wrote: 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 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 http://www.heavens-above.com/Gtrack.aspx?Session=kebgfdallldcgimjaonedkpfsatid=5580date=40843.617613831 7.2 15:42:26 10 S 15:49:21 77 E 15:57:21 10 NNE 27 Oct http://www.heavens-above.com/Gtrack.aspx?Session=kebgfdallldcgimjaonedkpfsatid=5580date=40843.6908054167 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
[amsat-bb] Re: [Re: Prospero] Commanding Error
Hi Roger et al The spectrogram attached for the 1310z Prospero pass today shows a carrier between 13:16 and 13:20 that matches the Prospero doppler profile (pretty well vertical), and exactly on 137.560MHz. There was some Orbcomm chuffing reasonably weak in the background, so it could be an Orbcomm satellite that exactly matched the doppler profile for Prospero. I couldnt hear anything significant in the audio. This was received with a non directional antenna. Do you have a similar spectrogram received with a beam antenna. If the signal wasn't there then we may assume it was from Orbcomm or similar in a different beam direction. cheers all 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 28 Oct 2011, at 10:25, Roger Duthie wrote: OK - so that's definitely Orbcomm (from the spectrogram). Have you got audio of this? We hear a chuffing sound intermittently (ie., it comes and goes in interval of minutes), which happens when neither Orbcomm nor Prospero is reported by our software to be above the horizon (is this the pager stuff you're talking about?). We also heard another thing a couple of days ago, though we're still not 100% on what that might have been (it appeared to be fading as Prospero receded to the North - though was it an aeroplane on 137.56?). Someone yesterday has supposedly heard something that's wasn't Orbcomm during the early evening pass. We'll look into it. The pass we're going to try today (for the sake of ceremony, really) is (again, times in BST = UT + 1): 28 Oct7.4 15:53:1810 S 16:00:2286 W 16:08:2810 N - Roger m0rja Tony Abbey wrote: Hi Roger Once Graham told me the noise was Orbcomm this morning, I added the TLEs for their satellites (http://www.orbcomm.com/Collateral/Documents/English-US/o11292.tle) to my SDR Radio software satellite definitions. Here's a pass I recorded from one of them this morning, and you can see that the chuff-chuff on the left hand side has structure which is kept vertical by the doppler correction. The other crap and pager cross talk etc bends with the doppler correction. I think that proves the point. 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 Spectrogram removed by RJAD (might ahve been bad for the amsat-bb board) On 27 Oct 2011, at 16:17, Roger Duthie wrote: We're hearing these 'chuff-chuff swooshes' too, though at times when our software is not showing Orbcomm over our horizon. Our TLEs may be slightly out-of-date, though I think it would be a marginal thing. Can it be definitely confirmed that these noises are Orbcomm? - Rr. Tony Abbey wrote: 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 Oct7.2 15:42:2610 S 15:49:2177 E 15:57:2110 NNE 27 Oct8.7 17:28:3110 WSW 17:34:4531 WNW 17:41:3910 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
[amsat-bb] Re: [Re: Prospero] Commanding Error
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
[amsat-bb] Re: [Re: Prospero] Commanding Error
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
[amsat-bb] Re: [Re: Prospero] Commanding Error
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 http://www.heavens-above.com/Gtrack.aspx?Session=kebgfdallldcgimjaonedkpfsatid=5580date=40843.617613831 7.2 15:42:26 10 S 15:49:21 77 E 15:57:21 10 NNE 27 Oct http://www.heavens-above.com/Gtrack.aspx?Session=kebgfdallldcgimjaonedkpfsatid=5580date=40843.6908054167 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
[amsat-bb] Re: [Re: Prospero] Commanding Error
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, 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
[amsat-bb] Re: [Re: Prospero] Commanding Error
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 Oct7.2 15:42:2610 S 15:49:2177 E 15:57:2110 NNE 27 Oct8.7 17:28:3110 WSW 17:34:4531 WNW 17:41:3910 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
[amsat-bb] Re: [Re: Prospero] Commanding Error
We're hearing these 'chuff-chuff swooshes' too, though at times when our software is not showing Orbcomm over our horizon. Our TLEs may be slightly out-of-date, though I think it would be a marginal thing. Can it be definitely confirmed that these noises are Orbcomm? - Rr. Tony Abbey wrote: 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 http://www.heavens-above.com/Gtrack.aspx?Session=kebgfdallldcgimjaonedkpfsatid=5580date=40843.617613831 7.2 15:42:26 10 S 15:49:21 77 E 15:57:21 10 NNE 27 Oct http://www.heavens-above.com/Gtrack.aspx?Session=kebgfdallldcgimjaonedkpfsatid=5580date=40843.6908054167 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 -- --- Roger J A Duthie PhD Candidate Plasma Group Department of Space
[amsat-bb] Re: [Re: Prospero] Commanding Error
Hi Roger Once Graham told me the noise was Orbcomm this morning, I added the TLEs for their satellites (http://www.orbcomm.com/Collateral/Documents/English-US/o11292.tle) to my SDR Radio software satellite definitions. Here's a pass I recorded from one of them this morning, and you can see that the chuff-chuff on the left hand side has structure which is kept vertical by the doppler correction. The other crap and pager cross talk etc bends with the doppler correction. I think that proves the point. 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 16:17, Roger Duthie wrote: We're hearing these 'chuff-chuff swooshes' too, though at times when our software is not showing Orbcomm over our horizon. Our TLEs may be slightly out-of-date, though I think it would be a marginal thing. Can it be definitely confirmed that these noises are Orbcomm? - Rr. Tony Abbey wrote: 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 15:42:2610 S 15:49:2177 E 15:57:2110 NNE 27 Oct 8.7 17:28:3110 WSW 17:34:4531 WNW 17:41:3910 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
[amsat-bb] Re: [Re: Prospero] Commanding Error
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 http://www.heavens-above.com/Gtrack.aspx?Session=kebgfdallleggankjgmmlbelsatid=5580date=40842.6100238657 7.3 15:31:43 10 S 15:38:26 60 E 15:46:11 10 NNE [Times in BST = UTC + 1] -Roger Tony Abbey wrote: Hi Roger I wasn't able to see any signal from Prospero yesterday. How did the commanding go? On 25 Oct 2011, at 09:47, Roger Duthie wrote: We had a problem with our end and couldn't command during this pass. If you'd have heard something, I'd have been surprised. We did manage to command during the later pass at around 1850 BST, though it was a low pass and we're not sure if we picked anything up. - Rr. PS., Attempting passes today at (in BST = UTC + 1): 25 Oct http://www.heavens-above.com/Gtrack.aspx?Session=kebgfdallkbipfnbnjhopgbhsatid=5580date=40841.6024848611 7.5 15:21:10 10 SSE 15:27:34 47 E 15:34:58 10 NNE 25 Oct http://www.heavens-above.com/Gtrack.aspx?Session=kebgfdallkbipfnbnjhopgbhsatid=5580date=40841.6750910069 8.1 17:05:33 10 SW 17:12:07 47 WNW 17:19:43 10 N ___ 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
[amsat-bb] Re: [Re: Prospero] Commanding Error
On Wed, Oct 26, 2011 at 12:39 PM, Roger Duthie r...@mssl.ucl.ac.uk 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 http://www.heavens-above.com/**Gtrack.aspx?Session=** kebgfdallleggankjgmmlbel**satid=5580date=40842.**6100238657http://www.heavens-above.com/Gtrack.aspx?Session=kebgfdallleggankjgmmlbelsatid=5580date=40842.6100238657 7.3 15:31:4310 S 15:38:2660 E 15:46:1110 NNE [Times in BST = UTC + 1] There was a brief item about Prospero near the end of the latest Space Boffins podcast: http://audioboo.fm/boos/519887-space-boffins-podcast-4 It mentions the involvement of hams in this project. 73s Bernhard VA6BMJ @ DO33FL ___ 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
[amsat-bb] Re: [Re: Prospero] Commanding Error
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 http://www.heavens-above.com/Gtrack.aspx?Session=kebgfdallleggankjgmmlbelsatid=5580date=40842.6100238657 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
[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 15:31:4310 S 15:38:2660 E 15:46:1110 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
