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=kebgfdallleggankjgmmlbel&satid=5580&date=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
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
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: rjad@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
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.shirville@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: rjad@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
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=kebgfdallldcgimjaonedkpf&satid=5580&date=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=kebgfdallldcgimjaonedkpf&satid=5580&date=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.shirville@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: rjad@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
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.shirville@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: rjad@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
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=kebgfdallldcgimjaonedkpf&satid=5580&date=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=kebgfdallldcgimjaonedkpf&satid=5580&date=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.shirville@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: rjad@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
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 15:42:26 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.shirville@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: rjad@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
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--
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 & Climate Physics UCL, London
w: +44(0)1483 204 100 ext 2299 m: +44(0)7938 55 70 44
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=kebgfdallldcgimjaonedkpf&satid=5580&date=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=kebgfdallldcgimjaonedkpf&satid=5580&date=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=kebgfdallldcgimjaonedkpf&satid=5580&date=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.shirville@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: rjad@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
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: pe0sat@vgnet.nl ; g.shirville@btinternet.com ; Phil Guttridge ; amsat-bb@amsat.org ; g8nsv@ntlworld.com ; Dale Potts ; Barry Hancock ; Richard Cole ; mailto:rac@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.shirville@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: rjad@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
On Fri, October 28, 2011 11:25, Roger Duthie wrote:
Hi Roger,
OK - so that's definitely Orbcomm (from the spectrogram). Have you got audio of this?
Yes I have the following audio files:
http://www.dev.vgnet.nl/bucket/files/Prospero-20-10-2011-1854CEST.wav 11,3 MB
http://www.dev.vgnet.nl/bucket/files/Prospero-21-10-2011-1906CEST.wav 92,3 MB
http://www.dev.vgnet.nl/bucket/files/Prospero-24-10-2011-1755CEST.wav 24,1 MB
Maybe you can perform some further analyses.
73 Jan PE0SAT
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 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.shirville@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: rjad@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 > >
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 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.shirville@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: rjad@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 > >
Hi Roger,
What became of the attempts to bring Prospero back to life?
Can you give us an update?
73 Jan - PE0SAT
Roger,
Can you send us an update?
A lot of people have spend time and energie on this and it would nice to hear how it ended?
- Did you ever hear prospero? - Was it possible to send commands to prospero? - How was de setup your group used? - Are there some audio-, video clips, picture? - An article on the whole proces of re-activating prospero? - New data on the satellite? - etc, etc.
73 Jan PE0SAT
Hi Roger,
What became of the attempts to bring Prospero back to life?
Can you give us an update?
73 Jan - PE0SAT
Apologies, Jan!
We've now set up a blgo at:
blogs.ucl.ac.uk/prospero-satellite
It's still in it's infancy, and we need to add backdated information on the project, though it will have all the goings on of the project that we're going to publicise.
Again, apologies for the silence.
-Rr.
PE0SAT wrote:
Roger,
Can you send us an update?
A lot of people have spend time and energie on this and it would nice to hear how it ended?
- Did you ever hear prospero?
- Was it possible to send commands to prospero?
- How was de setup your group used?
- Are there some audio-, video clips, picture?
- An article on the whole proces of re-activating prospero?
- New data on the satellite?
- etc, etc.
73 Jan PE0SAT
Hi Roger,
What became of the attempts to bring Prospero back to life?
Can you give us an update?
73 Jan - PE0SAT
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.shirville@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: rjad@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
participants (4)
-
g.shirville＠btinternet.com -
PE0SAT -
Roger Duthie -
Tony Abbey