Any word on the two Chinese microsats LongJiang 1 & 2?
Hi Mike,
I have been following on this twitter feed https://twitter.com/bg2bhc
73, Joe
On Tue, May 22, 2018 at 7:45 PM, Mike Seguin [email protected] wrote:
Any word on the two Chinese microsats LongJiang 1 & 2?
--
73, Mike, N1JEZ "A closed mouth gathers no feet" _______________________________________________ Sent via [email protected]. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
After their launch on 2018-05-20 at 21:28 UTC, LJ 1 and LJ 2 were maneuvered onto a track to the Moon. Several amateurs received telemetry from the satellites. But now LJ 1 appears to encounter problems.
Quoting Wei BG2BHC: "Can you help to find amateurs in the US to help to monitor DSLWP-A on 435.425 and 436.425 now? We lost the contact of satellite A on S band after an orbit adjustment. We just tried to switch on UHF, but we don't know if it works or not. The sat is just above South America. If it works, 435.425 should be 500bps GMSK and JT4 alternately. 436.425 should be 250 bps GMSK. Bothtransmit once in 5 minutes.
Thank you very much!
Wei"
73, Nico PA0DLO
On 22-05-18 12:15, Mike Seguin wrote:
Any word on the two Chinese microsats LongJiang 1 & 2?
Nico,
I have been trying to capture the signals from the both Longjiang sats for the past 2 days.
On Monday it seems that I receive a carrier on the right frequency but was not able to confirm that it was from Longjiang 1.
I used the initial Keppler’s and now using Celestrac in SatPC32 which seems to be OK when comparing with N2YO ele/az. I have been monitoring on the announced FX and having also JT4G “on” for about this evening without any results.
For sure I am doing something wrong but cannot figure it out due to the lack of information.
Also, trying to get a decoder software for the GMSK telemetry is quite difficult for a non-IT geek, I don’t have clue how to have the published GITHUB decoder to work on my Windows computers…
Here we are this side.
Quite frustrating that the communication is not that good, as if the project team want the maximum of feedback and TLM they should provide a minimum of info. Just a personal opinion.
Anyway will try hard to receive these birds as a real opportunity for HAM to learn more on outer space com, if anyone can help and share, particularly the guys who already decoded the birds, it would be more welcomed.
73
Jean Marc (3B8DU)
On May 22, 2018, at 5:03 PM, Nico Janssen [email protected] wrote:
After their launch on 2018-05-20 at 21:28 UTC, LJ 1 and LJ 2 were maneuvered onto a track to the Moon. Several amateurs received telemetry from the satellites. But now LJ 1 appears to encounter problems.
Quoting Wei BG2BHC: "Can you help to find amateurs in the US to help to monitor DSLWP-A on 435.425 and 436.425 now? We lost the contact of satellite A on S band after an orbit adjustment. We just tried to switch on UHF, but we don't know if it works or not. The sat is just above South America. If it works, 435.425 should be 500bps GMSK and JT4 alternately. 436.425 should be 250 bps GMSK. Bothtransmit once in 5 minutes.
Thank you very much!
Wei"
73, Nico PA0DLO
On 22-05-18 12:15, Mike Seguin wrote:
Any word on the two Chinese microsats LongJiang 1 & 2?
Sent via [email protected]. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
Jean,
I suggest usign the live Ubuntu ISO image with gnuradio and the necessary OOT modules for monitoring the GMSK signals. While installing gnuradio and the OOT modules manually can be done, it takes some effort. Running the live image is much easier. You do need a fast computer with at least four CPU cores to be able to run all the flowgraphs.
I had some difficulties with the doppler correction in my setup during the first pass. The predictions seemed off and I had to manually adjust the frequency offset to get the signals into the demodulators' passbands. Once that was done, I could decode the GMSK telemetry from both satellites up to 64000 km. Above 64000 km, my small antenna was no longer enough. I will get a better antenna ready and will try monitoring again over the weekend.
73, Edson PY2SDR
On Tue, May 22, 2018 at 1:21 PM, Jean Marc Momple < [email protected]> wrote:
Nico,
I have been trying to capture the signals from the both Longjiang sats for the past 2 days.
On Monday it seems that I receive a carrier on the right frequency but was not able to confirm that it was from Longjiang 1.
I used the initial Keppler’s and now using Celestrac in SatPC32 which seems to be OK when comparing with N2YO ele/az. I have been monitoring on the announced FX and having also JT4G “on” for about this evening without any results.
For sure I am doing something wrong but cannot figure it out due to the lack of information.
Also, trying to get a decoder software for the GMSK telemetry is quite difficult for a non-IT geek, I don’t have clue how to have the published GITHUB decoder to work on my Windows computers…
Here we are this side.
Quite frustrating that the communication is not that good, as if the project team want the maximum of feedback and TLM they should provide a minimum of info. Just a personal opinion.
Anyway will try hard to receive these birds as a real opportunity for HAM to learn more on outer space com, if anyone can help and share, particularly the guys who already decoded the birds, it would be more welcomed.
73
Jean Marc (3B8DU)
On May 22, 2018, at 5:03 PM, Nico Janssen [email protected] wrote:
After their launch on 2018-05-20 at 21:28 UTC, LJ 1 and LJ 2 were maneuvered onto a track to the Moon. Several amateurs received telemetry from the satellites. But now LJ 1 appears to encounter problems.
Quoting Wei BG2BHC: "Can you help to find amateurs in the US to help to monitor DSLWP-A on 435.425 and 436.425 now? We lost the contact of satellite A on S band after an orbit adjustment. We just tried to switch on UHF, but we don't know if it works or not. The sat is just above South America. If it works, 435.425 should be 500bps GMSK and JT4 alternately. 436.425 should be 250 bps GMSK. Bothtransmit once in 5 minutes.
Thank you very much!
Wei"
73, Nico PA0DLO
On 22-05-18 12:15, Mike Seguin wrote:
Any word on the two Chinese microsats LongJiang 1 & 2?
Sent via [email protected]. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership.
Opinions expressed
are solely those of the author, and do not reflect the official views of
AMSAT-NA.
Not an AMSAT-NA member? Join now to support the amateur satellite
program!
Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
Sent via [email protected]. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
Edson,
My congratulations (and for sure from the the community) for achieving the reception of the Longjiang and decoding the telemetry.
I would be grateful if you could let me know what antenna you have been using so far (up to 64K km) just for my learning.
73
Jean Marc (3B8DU)
On May 22, 2018, at 8:38 PM, Edson W. R. Pereira [email protected] wrote:
Jean,
I suggest usign the live Ubuntu ISO image with gnuradio and the necessary OOT modules for monitoring the GMSK signals. While installing gnuradio and the OOT modules manually can be done, it takes some effort. Running the live image is much easier. You do need a fast computer with at least four CPU cores to be able to run all the flowgraphs.
I had some difficulties with the doppler correction in my setup during the first pass. The predictions seemed off and I had to manually adjust the frequency offset to get the signals into the demodulators' passbands. Once that was done, I could decode the GMSK telemetry from both satellites up to 64000 km. Above 64000 km, my small antenna was no longer enough. I will get a better antenna ready and will try monitoring again over the weekend.
73, Edson PY2SDR
On Tue, May 22, 2018 at 1:21 PM, Jean Marc Momple <[email protected] mailto:[email protected]> wrote: Nico,
I have been trying to capture the signals from the both Longjiang sats for the past 2 days.
On Monday it seems that I receive a carrier on the right frequency but was not able to confirm that it was from Longjiang 1.
I used the initial Keppler’s and now using Celestrac in SatPC32 which seems to be OK when comparing with N2YO ele/az. I have been monitoring on the announced FX and having also JT4G “on” for about this evening without any results.
For sure I am doing something wrong but cannot figure it out due to the lack of information.
Also, trying to get a decoder software for the GMSK telemetry is quite difficult for a non-IT geek, I don’t have clue how to have the published GITHUB decoder to work on my Windows computers…
Here we are this side.
Quite frustrating that the communication is not that good, as if the project team want the maximum of feedback and TLM they should provide a minimum of info. Just a personal opinion.
Anyway will try hard to receive these birds as a real opportunity for HAM to learn more on outer space com, if anyone can help and share, particularly the guys who already decoded the birds, it would be more welcomed.
73
Jean Marc (3B8DU)
On May 22, 2018, at 5:03 PM, Nico Janssen <[email protected] mailto:[email protected]> wrote:
After their launch on 2018-05-20 at 21:28 UTC, LJ 1 and LJ 2 were maneuvered onto a track to the Moon. Several amateurs received telemetry from the satellites. But now LJ 1 appears to encounter problems.
Quoting Wei BG2BHC: "Can you help to find amateurs in the US to help to monitor DSLWP-A on 435.425 and 436.425 now? We lost the contact of satellite A on S band after an orbit adjustment. We just tried to switch on UHF, but we don't know if it works or not. The sat is just above South America. If it works, 435.425 should be 500bps GMSK and JT4 alternately. 436.425 should be 250 bps GMSK. Bothtransmit once in 5 minutes.
Thank you very much!
Wei"
73, Nico PA0DLO
On 22-05-18 12:15, Mike Seguin wrote:
Any word on the two Chinese microsats LongJiang 1 & 2?
Sent via [email protected] mailto:[email protected]. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb http://www.amsat.org/mailman/listinfo/amsat-bb
Sent via [email protected] mailto:[email protected]. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb http://www.amsat.org/mailman/listinfo/amsat-bb
Jean Marc,
I've used a home-made 4-el LFA tuned for 436.5 MHz. It is the one in Figure-3 in this article:
http://amsat-br.org/cubesat-serpens-decodificacao-dos-sinais/
The preamp used was an ARR SP432VDG (not the one shown in the picture). The RX hardware was a Nooelec NESDR Smart (RTL-SDR).
73, Edson PY2SDR
On Wed, May 23, 2018 at 3:31 PM, Jean Marc Momple < [email protected]> wrote:
Edson,
My congratulations (and for sure from the the community) for achieving the reception of the Longjiang and decoding the telemetry.
I would be grateful if you could let me know what antenna you have been using so far (up to 64K km) just for my learning.
73
Jean Marc (3B8DU)
On May 22, 2018, at 8:38 PM, Edson W. R. Pereira [email protected] wrote:
Jean,
I suggest usign the live Ubuntu ISO image with gnuradio and the necessary OOT modules for monitoring the GMSK signals. While installing gnuradio and the OOT modules manually can be done, it takes some effort. Running the live image is much easier. You do need a fast computer with at least four CPU cores to be able to run all the flowgraphs.
I had some difficulties with the doppler correction in my setup during the first pass. The predictions seemed off and I had to manually adjust the frequency offset to get the signals into the demodulators' passbands. Once that was done, I could decode the GMSK telemetry from both satellites up to 64000 km. Above 64000 km, my small antenna was no longer enough. I will get a better antenna ready and will try monitoring again over the weekend.
73, Edson PY2SDR
On Tue, May 22, 2018 at 1:21 PM, Jean Marc Momple < [email protected]> wrote:
Nico,
I have been trying to capture the signals from the both Longjiang sats for the past 2 days.
On Monday it seems that I receive a carrier on the right frequency but was not able to confirm that it was from Longjiang 1.
I used the initial Keppler’s and now using Celestrac in SatPC32 which seems to be OK when comparing with N2YO ele/az. I have been monitoring on the announced FX and having also JT4G “on” for about this evening without any results.
For sure I am doing something wrong but cannot figure it out due to the lack of information.
Also, trying to get a decoder software for the GMSK telemetry is quite difficult for a non-IT geek, I don’t have clue how to have the published GITHUB decoder to work on my Windows computers…
Here we are this side.
Quite frustrating that the communication is not that good, as if the project team want the maximum of feedback and TLM they should provide a minimum of info. Just a personal opinion.
Anyway will try hard to receive these birds as a real opportunity for HAM to learn more on outer space com, if anyone can help and share, particularly the guys who already decoded the birds, it would be more welcomed.
73
Jean Marc (3B8DU)
On May 22, 2018, at 5:03 PM, Nico Janssen [email protected] wrote:
After their launch on 2018-05-20 at 21:28 UTC, LJ 1 and LJ 2 were maneuvered onto a track to the Moon. Several amateurs received telemetry from the satellites. But now LJ 1 appears to encounter problems.
Quoting Wei BG2BHC: "Can you help to find amateurs in the US to help to monitor DSLWP-A on 435.425 and 436.425 now? We lost the contact of satellite A on S band after an orbit adjustment. We just tried to switch on UHF, but we don't know if it works or not. The sat is just above South America. If it works, 435.425 should be 500bps GMSK and JT4 alternately. 436.425 should be 250 bps GMSK. Bothtransmit once in 5 minutes.
Thank you very much!
Wei"
73, Nico PA0DLO
On 22-05-18 12:15, Mike Seguin wrote:
Any word on the two Chinese microsats LongJiang 1 & 2?
Sent via [email protected]. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership.
Opinions expressed
are solely those of the author, and do not reflect the official views
of AMSAT-NA.
Not an AMSAT-NA member? Join now to support the amateur satellite
program!
Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
Sent via [email protected]. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
Edson,
Thanks for the info.
I have a 18 ele yagi therefore hopefully will be able to catch the birds eventually, worse case with FT4.
Thanks again, it helps to try and experiment.
73
Jean Marc (3B8DU)
On May 23, 2018, at 10:46 PM, Edson W. R. Pereira [email protected] wrote:
Jean Marc,
I've used a home-made 4-el LFA tuned for 436.5 MHz. It is the one in Figure-3 in this article:
http://amsat-br.org/cubesat-serpens-decodificacao-dos-sinais/ http://amsat-br.org/cubesat-serpens-decodificacao-dos-sinais/
The preamp used was an ARR SP432VDG (not the one shown in the picture). The RX hardware was a Nooelec NESDR Smart (RTL-SDR).
73, Edson PY2SDR
On Wed, May 23, 2018 at 3:31 PM, Jean Marc Momple <[email protected] mailto:[email protected]> wrote: Edson,
My congratulations (and for sure from the the community) for achieving the reception of the Longjiang and decoding the telemetry.
I would be grateful if you could let me know what antenna you have been using so far (up to 64K km) just for my learning.
73
Jean Marc (3B8DU)
On May 22, 2018, at 8:38 PM, Edson W. R. Pereira <[email protected] mailto:[email protected]> wrote:
Jean,
I suggest usign the live Ubuntu ISO image with gnuradio and the necessary OOT modules for monitoring the GMSK signals. While installing gnuradio and the OOT modules manually can be done, it takes some effort. Running the live image is much easier. You do need a fast computer with at least four CPU cores to be able to run all the flowgraphs.
I had some difficulties with the doppler correction in my setup during the first pass. The predictions seemed off and I had to manually adjust the frequency offset to get the signals into the demodulators' passbands. Once that was done, I could decode the GMSK telemetry from both satellites up to 64000 km. Above 64000 km, my small antenna was no longer enough. I will get a better antenna ready and will try monitoring again over the weekend.
73, Edson PY2SDR
On Tue, May 22, 2018 at 1:21 PM, Jean Marc Momple <[email protected] mailto:[email protected]> wrote: Nico,
I have been trying to capture the signals from the both Longjiang sats for the past 2 days.
On Monday it seems that I receive a carrier on the right frequency but was not able to confirm that it was from Longjiang 1.
I used the initial Keppler’s and now using Celestrac in SatPC32 which seems to be OK when comparing with N2YO ele/az. I have been monitoring on the announced FX and having also JT4G “on” for about this evening without any results.
For sure I am doing something wrong but cannot figure it out due to the lack of information.
Also, trying to get a decoder software for the GMSK telemetry is quite difficult for a non-IT geek, I don’t have clue how to have the published GITHUB decoder to work on my Windows computers…
Here we are this side.
Quite frustrating that the communication is not that good, as if the project team want the maximum of feedback and TLM they should provide a minimum of info. Just a personal opinion.
Anyway will try hard to receive these birds as a real opportunity for HAM to learn more on outer space com, if anyone can help and share, particularly the guys who already decoded the birds, it would be more welcomed.
73
Jean Marc (3B8DU)
On May 22, 2018, at 5:03 PM, Nico Janssen <[email protected] mailto:[email protected]> wrote:
After their launch on 2018-05-20 at 21:28 UTC, LJ 1 and LJ 2 were maneuvered onto a track to the Moon. Several amateurs received telemetry from the satellites. But now LJ 1 appears to encounter problems.
Quoting Wei BG2BHC: "Can you help to find amateurs in the US to help to monitor DSLWP-A on 435.425 and 436.425 now? We lost the contact of satellite A on S band after an orbit adjustment. We just tried to switch on UHF, but we don't know if it works or not. The sat is just above South America. If it works, 435.425 should be 500bps GMSK and JT4 alternately. 436.425 should be 250 bps GMSK. Bothtransmit once in 5 minutes.
Thank you very much!
Wei"
73, Nico PA0DLO
On 22-05-18 12:15, Mike Seguin wrote:
Any word on the two Chinese microsats LongJiang 1 & 2?
Sent via [email protected] mailto:[email protected]. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb http://www.amsat.org/mailman/listinfo/amsat-bb
Sent via [email protected] mailto:[email protected]. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb http://www.amsat.org/mailman/listinfo/amsat-bb
Greetings!
The software on github (https://github.com/bg2bhc/gr-dslwp) is for use in GNU Radio on linux, so a Windows computer would not be helpful for that.
In the hours after launch, several Amateurs (http://lilacsat.hit.edu.cn/dashboard/pages_en/contribute.html) successfully decoded the 70cm telemetry using those GNU Radio flowgraphs (I got some partial decodes but low SNR here prevented me from getting complete packets - but I was still very pleased!).
Last night (U.S. time), I'm not aware of anyone receiving any of the 70cm telemetry. We were asked to watch for JT4 as well, but I'm not aware that any was received.
As mentioned earlier in this thread, the team has lost S-Band contact with one of the cubesats. I'm not setup to receive those frequencies but others are watching for the signals.
For an average station like myself, the plan will be to continue to watch for 70cm telemetry with the GNU Radio software & JT4 with a second SDR.
Hope that helps!
-Scott, K4KDR
===========================================
-----Original Message----- From: Jean Marc Momple Sent: Tuesday, May 22, 2018 12:21 PM To: Nico Janssen Cc: AMSAT BB Subject: Re: [amsat-bb] Chinese Lunar sats
Nico,
I have been trying to capture the signals from the both Longjiang sats for the past 2 days.
On Monday it seems that I receive a carrier on the right frequency but was not able to confirm that it was from Longjiang 1.
I used the initial Keppler’s and now using Celestrac in SatPC32 which seems to be OK when comparing with N2YO ele/az. I have been monitoring on the announced FX and having also JT4G “on” for about this evening without any results.
For sure I am doing something wrong but cannot figure it out due to the lack of information.
Also, trying to get a decoder software for the GMSK telemetry is quite difficult for a non-IT geek, I don’t have clue how to have the published GITHUB decoder to work on my Windows computers…
Here we are this side.
Quite frustrating that the communication is not that good, as if the project team want the maximum of feedback and TLM they should provide a minimum of info. Just a personal opinion.
Anyway will try hard to receive these birds as a real opportunity for HAM to learn more on outer space com, if anyone can help and share, particularly the guys who already decoded the birds, it would be more welcomed.
73
Jean Marc (3B8DU)
On May 22, 2018, at 5:03 PM, Nico Janssen [email protected] wrote:
After their launch on 2018-05-20 at 21:28 UTC, LJ 1 and LJ 2 were maneuvered onto a track to the Moon. Several amateurs received telemetry from the satellites. But now LJ 1 appears to encounter problems.
Quoting Wei BG2BHC: "Can you help to find amateurs in the US to help to monitor DSLWP-A on 435.425 and 436.425 now? We lost the contact of satellite A on S band after an orbit adjustment. We just tried to switch on UHF, but we don't know if it works or not. The sat is just above South America. If it works, 435.425 should be 500bps GMSK and JT4 alternately. 436.425 should be 250 bps GMSK. Bothtransmit once in 5 minutes.
Thank you very much!
Wei"
73, Nico PA0DLO
On 22-05-18 12:15, Mike Seguin wrote:
Any word on the two Chinese microsats LongJiang 1 & 2?
Scott,
Thanks and my greetings to you also.
Very clear and thank you for the insights.
Unfortunately I don’t have the required skills about linux and IT, in spite having quite a good RF knowledge (some 40 years professionally in SATs, Mobile, PMR, microwave and mobile up to 5G now), i just know how to install the APP’s o a PC and to do some basics settings…
Also, my station is quite average as yours, as the Longjiang experiment is quite interesting will continue to watch out and try receive some signals from these birds. But again wish to stress that the project managers would have much more audience and feedback if sharing more info (basic marketing), just a honest comment for improvement in such future projects. This seems always to be the case in such HAM sat ventures, that the direct stakeholders are so taken with urgent matters (fully understood) that they fail to communicate well to get the best feedback after launch from the HAM community which actually would help them a lot in assessing there bird performance.
Hope my comments will help to improve our beloved projects.
73
Jean Marc (3B8DU)
On May 22, 2018, at 8:42 PM, Scott [email protected] wrote:
Greetings!
The software on github (https://github.com/bg2bhc/gr-dslwp) is for use in GNU Radio on linux, so a Windows computer would not be helpful for that.
In the hours after launch, several Amateurs (http://lilacsat.hit.edu.cn/dashboard/pages_en/contribute.html) successfully decoded the 70cm telemetry using those GNU Radio flowgraphs (I got some partial decodes but low SNR here prevented me from getting complete packets - but I was still very pleased!).
Last night (U.S. time), I'm not aware of anyone receiving any of the 70cm telemetry. We were asked to watch for JT4 as well, but I'm not aware that any was received.
As mentioned earlier in this thread, the team has lost S-Band contact with one of the cubesats. I'm not setup to receive those frequencies but others are watching for the signals.
For an average station like myself, the plan will be to continue to watch for 70cm telemetry with the GNU Radio software & JT4 with a second SDR.
Hope that helps!
-Scott, K4KDR
===========================================
-----Original Message----- From: Jean Marc Momple Sent: Tuesday, May 22, 2018 12:21 PM To: Nico Janssen Cc: AMSAT BB Subject: Re: [amsat-bb] Chinese Lunar sats
Nico,
I have been trying to capture the signals from the both Longjiang sats for the past 2 days.
On Monday it seems that I receive a carrier on the right frequency but was not able to confirm that it was from Longjiang 1.
I used the initial Keppler’s and now using Celestrac in SatPC32 which seems to be OK when comparing with N2YO ele/az. I have been monitoring on the announced FX and having also JT4G “on” for about this evening without any results.
For sure I am doing something wrong but cannot figure it out due to the lack of information.
Also, trying to get a decoder software for the GMSK telemetry is quite difficult for a non-IT geek, I don’t have clue how to have the published GITHUB decoder to work on my Windows computers…
Here we are this side.
Quite frustrating that the communication is not that good, as if the project team want the maximum of feedback and TLM they should provide a minimum of info. Just a personal opinion.
Anyway will try hard to receive these birds as a real opportunity for HAM to learn more on outer space com, if anyone can help and share, particularly the guys who already decoded the birds, it would be more welcomed.
73
Jean Marc (3B8DU)
On May 22, 2018, at 5:03 PM, Nico Janssen [email protected] wrote:
After their launch on 2018-05-20 at 21:28 UTC, LJ 1 and LJ 2 were maneuvered onto a track to the Moon. Several amateurs received telemetry from the satellites. But now LJ 1 appears to encounter problems.
Quoting Wei BG2BHC: "Can you help to find amateurs in the US to help to monitor DSLWP-A on 435.425 and 436.425 now? We lost the contact of satellite A on S band after an orbit adjustment. We just tried to switch on UHF, but we don't know if it works or not. The sat is just above South America. If it works, 435.425 should be 500bps GMSK and JT4 alternately. 436.425 should be 250 bps GMSK. Bothtransmit once in 5 minutes.
Thank you very much!
Wei"
73, Nico PA0DLO
On 22-05-18 12:15, Mike Seguin wrote:
Any word on the two Chinese microsats LongJiang 1 & 2?
Sent via [email protected]. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
Scott and the other Windows users,
Windows is completely ignored. The live Linux CD is live! You insert it in your DVD/CD drive and reboot your PC. Linux will load into RAM and run exclusively from RAM. It has a desktop not much different from a Windows PC or an Apple Mac. Give it a try. My mother started using Linux when she was 84, and she certainly didn't have an IT background!
Larry AC8YE
On Tue, May 22, 2018 at 1:50 PM, Jean Marc Momple < [email protected]> wrote:
Scott,
Thanks and my greetings to you also.
Very clear and thank you for the insights.
Unfortunately I don’t have the required skills about linux and IT, in spite having quite a good RF knowledge (some 40 years professionally in SATs, Mobile, PMR, microwave and mobile up to 5G now), i just know how to install the APP’s o a PC and to do some basics settings…
Also, my station is quite average as yours, as the Longjiang experiment is quite interesting will continue to watch out and try receive some signals from these birds. But again wish to stress that the project managers would have much more audience and feedback if sharing more info (basic marketing), just a honest comment for improvement in such future projects. This seems always to be the case in such HAM sat ventures, that the direct stakeholders are so taken with urgent matters (fully understood) that they fail to communicate well to get the best feedback after launch from the HAM community which actually would help them a lot in assessing there bird performance.
Hope my comments will help to improve our beloved projects.
73
Jean Marc (3B8DU)
On May 22, 2018, at 8:42 PM, Scott [email protected] wrote:
Greetings!
The software on github (https://github.com/bg2bhc/gr-dslwp) is for use
in GNU Radio on linux, so a Windows computer would not be helpful for that.
In the hours after launch, several Amateurs (http://lilacsat.hit.edu.cn/
dashboard/pages_en/contribute.html) successfully decoded the 70cm telemetry using those GNU Radio flowgraphs (I got some partial decodes but low SNR here prevented me from getting complete packets - but I was still very pleased!).
Last night (U.S. time), I'm not aware of anyone receiving any of the
70cm telemetry. We were asked to watch for JT4 as well, but I'm not aware that any was received.
As mentioned earlier in this thread, the team has lost S-Band contact
with one of the cubesats. I'm not setup to receive those frequencies but others are watching for the signals.
For an average station like myself, the plan will be to continue to
watch for 70cm telemetry with the GNU Radio software & JT4 with a second SDR.
Hope that helps!
-Scott, K4KDR
===========================================
-----Original Message----- From: Jean Marc Momple Sent: Tuesday, May 22, 2018 12:21 PM To: Nico Janssen Cc: AMSAT BB Subject: Re: [amsat-bb] Chinese Lunar sats
Nico,
I have been trying to capture the signals from the both Longjiang sats
for the past 2 days.
On Monday it seems that I receive a carrier on the right frequency but
was not able to confirm that it was from Longjiang 1.
I used the initial Keppler’s and now using Celestrac in SatPC32 which
seems to be OK when comparing with N2YO ele/az. I have been monitoring on the announced FX and having also JT4G “on” for about this evening without any results.
For sure I am doing something wrong but cannot figure it out due to the
lack of information.
Also, trying to get a decoder software for the GMSK telemetry is quite
difficult for a non-IT geek, I don’t have clue how to have the published GITHUB decoder to work on my Windows computers…
Here we are this side.
Quite frustrating that the communication is not that good, as if the
project team want the maximum of feedback and TLM they should provide a minimum of info. Just a personal opinion.
Anyway will try hard to receive these birds as a real opportunity for
HAM to learn more on outer space com, if anyone can help and share, particularly the guys who already decoded the birds, it would be more welcomed.
73
Jean Marc (3B8DU)
On May 22, 2018, at 5:03 PM, Nico Janssen [email protected] wrote:
After their launch on 2018-05-20 at 21:28 UTC, LJ 1 and LJ 2 were maneuvered onto a track to the Moon. Several amateurs received telemetry from the satellites. But now LJ 1 appears to encounter problems.
Quoting Wei BG2BHC: "Can you help to find amateurs in the US to help to monitor DSLWP-A on 435.425 and 436.425 now? We lost the contact of satellite A on S band after an orbit adjustment. We just tried to switch on UHF, but we don't know if it works or not. The sat is just above South America. If it works, 435.425 should be 500bps GMSK and JT4 alternately. 436.425 should be 250 bps GMSK. Bothtransmit once in 5 minutes.
Thank you very much!
Wei"
73, Nico PA0DLO
On 22-05-18 12:15, Mike Seguin wrote:
Any word on the two Chinese microsats LongJiang 1 & 2?
Sent via [email protected]. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership.
Opinions expressed
are solely those of the author, and do not reflect the official views of
AMSAT-NA.
Not an AMSAT-NA member? Join now to support the amateur satellite
program!
Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
Sent via [email protected]. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
Very good point, Larry. Thanks for mentioning that.
Before I had a computer dedicated to linux-only, on numerous past projects that required GNU Radio I used a bootable CD and it works great. Your base operating system is untouched.
There are performance advantages to having linux installed on a dedicated computer, but to learn what linux & GNU Radio is about, the bootable CD is a great option.
-Scott, K4KDR
=======================
On Tue, May 22, 2018 at 4:26 PM, Larry Howell [email protected] wrote:
Scott and the other Windows users,
Windows is completely ignored. The live Linux CD is live! You insert it in your DVD/CD drive and reboot your PC. Linux will load into RAM and run exclusively from RAM. It has a desktop not much different from a Windows PC or an Apple Mac. Give it a try. My mother started using Linux when she was 84, and she certainly didn't have an IT background!
Larry AC8YE
On Tue, May 22, 2018 at 1:50 PM, Jean Marc Momple < [email protected]> wrote:
Scott,
Thanks and my greetings to you also.
Very clear and thank you for the insights.
Unfortunately I don’t have the required skills about linux and IT, in spite having quite a good RF knowledge (some 40 years professionally in SATs, Mobile, PMR, microwave and mobile up to 5G now), i just know how to install the APP’s o a PC and to do some basics settings…
Also, my station is quite average as yours, as the Longjiang experiment is quite interesting will continue to watch out and try receive some signals from these birds. But again wish to stress that the project managers would have much more audience and feedback if sharing more info (basic marketing), just a honest comment for improvement in such future projects. This seems always to be the case in such HAM sat ventures, that the direct stakeholders are so taken with urgent matters (fully understood) that they fail to communicate well to get the best feedback after launch from the HAM community which actually would help them a lot in assessing there bird performance.
Hope my comments will help to improve our beloved projects.
73
Jean Marc (3B8DU)
On May 22, 2018, at 8:42 PM, Scott [email protected] wrote:
Greetings!
The software on github (https://github.com/bg2bhc/gr-dslwp) is for
use in GNU Radio on linux, so a Windows computer would not be helpful for that.
In the hours after launch, several Amateurs (
http://lilacsat.hit.edu.cn/dashboard/pages_en/contribute.html) successfully decoded the 70cm telemetry using those GNU Radio flowgraphs (I got some partial decodes but low SNR here prevented me from getting complete packets - but I was still very pleased!).
Last night (U.S. time), I'm not aware of anyone receiving any of the
70cm telemetry. We were asked to watch for JT4 as well, but I'm not aware that any was received.
As mentioned earlier in this thread, the team has lost S-Band contact
with one of the cubesats. I'm not setup to receive those frequencies but others are watching for the signals.
For an average station like myself, the plan will be to continue to
watch for 70cm telemetry with the GNU Radio software & JT4 with a second SDR.
Hope that helps!
-Scott, K4KDR
===========================================
-----Original Message----- From: Jean Marc Momple Sent: Tuesday, May 22, 2018 12:21 PM To: Nico Janssen Cc: AMSAT BB Subject: Re: [amsat-bb] Chinese Lunar sats
Nico,
I have been trying to capture the signals from the both Longjiang sats
for the past 2 days.
On Monday it seems that I receive a carrier on the right frequency but
was not able to confirm that it was from Longjiang 1.
I used the initial Keppler’s and now using Celestrac in SatPC32 which
seems to be OK when comparing with N2YO ele/az. I have been monitoring on the announced FX and having also JT4G “on” for about this evening without any results.
For sure I am doing something wrong but cannot figure it out due to the
lack of information.
Also, trying to get a decoder software for the GMSK telemetry is quite
difficult for a non-IT geek, I don’t have clue how to have the published GITHUB decoder to work on my Windows computers…
Here we are this side.
Quite frustrating that the communication is not that good, as if the
project team want the maximum of feedback and TLM they should provide a minimum of info. Just a personal opinion.
Anyway will try hard to receive these birds as a real opportunity for
HAM to learn more on outer space com, if anyone can help and share, particularly the guys who already decoded the birds, it would be more welcomed.
73
Jean Marc (3B8DU)
On May 22, 2018, at 5:03 PM, Nico Janssen [email protected] wrote:
After their launch on 2018-05-20 at 21:28 UTC, LJ 1 and LJ 2 were maneuvered onto a track to the Moon. Several amateurs received telemetry from the satellites. But now LJ 1 appears to encounter problems.
Quoting Wei BG2BHC: "Can you help to find amateurs in the US to help to monitor DSLWP-A on 435.425 and 436.425 now? We lost the contact of satellite A on S band after an orbit adjustment. We just tried to switch on UHF, but we don't know if it works or not. The sat is just above South America. If it works, 435.425 should be 500bps GMSK and JT4 alternately. 436.425 should be 250 bps GMSK. Bothtransmit once in 5 minutes.
Thank you very much!
Wei"
73, Nico PA0DLO
On 22-05-18 12:15, Mike Seguin wrote:
Any word on the two Chinese microsats LongJiang 1 & 2?
So where is this LIVE cd that is mentioned for these new sats?
Thanks,
Walter/K5WH
-----Original Message----- From: AMSAT-BB [email protected] On Behalf Of Larry Howell Sent: Tuesday, May 22, 2018 3:27 PM To: Scott [email protected]; [email protected] Subject: Re: [amsat-bb] Chinese Lunar sats
Scott and the other Windows users,
Windows is completely ignored. The live Linux CD is live! You insert it in your DVD/CD drive and reboot your PC. Linux will load into RAM and run exclusively from RAM. It has a desktop not much different from a Windows PC or an Apple Mac. Give it a try. My mother started using Linux when she was 84, and she certainly didn't have an IT background!
Larry AC8YE
On Tue, May 22, 2018 at 1:50 PM, Jean Marc Momple < [email protected]> wrote:
Scott,
Thanks and my greetings to you also.
Very clear and thank you for the insights.
Unfortunately I don’t have the required skills about linux and IT, in spite having quite a good RF knowledge (some 40 years professionally in SATs, Mobile, PMR, microwave and mobile up to 5G now), i just know how to install the APP’s o a PC and to do some basics settings…
Also, my station is quite average as yours, as the Longjiang experiment is quite interesting will continue to watch out and try receive some signals from these birds. But again wish to stress that the project managers would have much more audience and feedback if sharing more info (basic marketing), just a honest comment for improvement in such future projects. This seems always to be the case in such HAM sat ventures, that the direct stakeholders are so taken with urgent matters (fully understood) that they fail to communicate well to get the best feedback after launch from the HAM community which actually would help them a lot in assessing there bird performance.
Hope my comments will help to improve our beloved projects.
73
Jean Marc (3B8DU)
On May 22, 2018, at 8:42 PM, Scott [email protected] wrote:
Greetings!
The software on github (https://github.com/bg2bhc/gr-dslwp) is for use
in GNU Radio on linux, so a Windows computer would not be helpful for that.
In the hours after launch, several Amateurs (http://lilacsat.hit.edu.cn/
dashboard/pages_en/contribute.html) successfully decoded the 70cm telemetry using those GNU Radio flowgraphs (I got some partial decodes but low SNR here prevented me from getting complete packets - but I was still very pleased!).
Last night (U.S. time), I'm not aware of anyone receiving any of the
70cm telemetry. We were asked to watch for JT4 as well, but I'm not aware that any was received.
As mentioned earlier in this thread, the team has lost S-Band contact
with one of the cubesats. I'm not setup to receive those frequencies but others are watching for the signals.
For an average station like myself, the plan will be to continue to
watch for 70cm telemetry with the GNU Radio software & JT4 with a second SDR.
Hope that helps!
-Scott, K4KDR
===========================================
-----Original Message----- From: Jean Marc Momple Sent: Tuesday, May 22, 2018 12:21 PM To: Nico Janssen Cc: AMSAT BB Subject: Re: [amsat-bb] Chinese Lunar sats
Nico,
I have been trying to capture the signals from the both Longjiang sats
for the past 2 days.
On Monday it seems that I receive a carrier on the right frequency but
was not able to confirm that it was from Longjiang 1.
I used the initial Keppler’s and now using Celestrac in SatPC32 which
seems to be OK when comparing with N2YO ele/az. I have been monitoring on the announced FX and having also JT4G “on” for about this evening without any results.
For sure I am doing something wrong but cannot figure it out due to the
lack of information.
Also, trying to get a decoder software for the GMSK telemetry is quite
difficult for a non-IT geek, I don’t have clue how to have the published GITHUB decoder to work on my Windows computers…
Here we are this side.
Quite frustrating that the communication is not that good, as if the
project team want the maximum of feedback and TLM they should provide a minimum of info. Just a personal opinion.
Anyway will try hard to receive these birds as a real opportunity for
HAM to learn more on outer space com, if anyone can help and share, particularly the guys who already decoded the birds, it would be more welcomed.
73
Jean Marc (3B8DU)
On May 22, 2018, at 5:03 PM, Nico Janssen [email protected] wrote:
After their launch on 2018-05-20 at 21:28 UTC, LJ 1 and LJ 2 were maneuvered onto a track to the Moon. Several amateurs received telemetry from the satellites. But now LJ 1 appears to encounter problems.
Quoting Wei BG2BHC: "Can you help to find amateurs in the US to help to monitor DSLWP-A on 435.425 and 436.425 now? We lost the contact of satellite A on S band after an orbit adjustment. We just tried to switch on UHF, but we don't know if it works or not. The sat is just above South America. If it works, 435.425 should be 500bps GMSK and JT4 alternately. 436.425 should be 250 bps GMSK. Bothtransmit once in 5 minutes.
Thank you very much!
Wei"
73, Nico PA0DLO
On 22-05-18 12:15, Mike Seguin wrote:
Any word on the two Chinese microsats LongJiang 1 & 2?
Sent via [email protected]. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership.
Opinions expressed
are solely those of the author, and do not reflect the official views of
AMSAT-NA.
Not an AMSAT-NA member? Join now to support the amateur satellite
program!
Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
Sent via [email protected]. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
_______________________________________________ Sent via [email protected]. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
participants (8)
-
Edson W. R. Pereira -
Jean Marc Momple -
Joe Pereira -
Larry Howell -
Mike Seguin -
Nico Janssen -
Scott -
Walter Holmes