Ten Russian cubesats to be deployed from the ISS
On July 21 Russian cosmonaut Oleg Artemyev and ESA astronaut Samantha Cristoforetti will carry out an EVA outside the ISS. During that 7 hours long EVA, starting at around 14:00 UTC, the spacewalkers are planned to deploy ten Russian cubesats into orbit under the program of the space experiment "Radioskaf". The EVA, including the deployment of the cubesats, can be witnessed live on NASA-TV.
RS10S (aka SWSU-55 No. 1 & R-390 (SWGU No. 5)) Telemetry: 437.050 MHz 1200 bps AX.25 AFSK Payload: 437.050 MHz 1200/2400/4800 bps AX.25 AFSK, SSTV, AUDIO, TEXT
RS11S (aka SWSU-55 No. 2 (SWGU No. 6)) Telemetry: 437.050 MHz 1200 bps AX.25 AFSK Payload: 437.062 MHz 1200/2400/4800 bps AX.25 AFSK, SSTV, AUDIO, TEXT
RS1S (aka SWSU-55 No. 3 (SWGU No. 7)) Telemetry: 437.050 MHz 1200 bps AX.25 AFSK Payload: 437.075 MHz 1200/2400/4800 bps AX.25 AFSK, SSTV, AUDIO, TEXT
RS2S (aka SWSU-55 No. 4 (SWGU No. 8)) Telemetry: 437.050 MHz 1200 bps AX.25 AFSK Payload: 437.082 MHz 1200/2400/4800 bps AX.25 AFSK, SSTV, AUDIO, TEXT
RS3S (aka SWSU-55 No. 5 (SWGU No. 9)) Telemetry: 437.050 MHz 1200 bps AX.25 AFSK Payload: 437.100 MHz 1200/2400/4800 bps AX.25 AFSK, SSTV, AUDIO, TEXT
RS4S (aka SWSU-55 No. 6 (SWGU No. 10)) Telemetry: 437.050 MHz 1200 bps AX.25 AFSK Payload: 437.087 MHz 1200/2400/4800 bps AX.25 AFSK, SSTV, AUDIO, TEXT
RS5S (aka SWSU-55 No. 7 & R-390 (SWGU No. 11)) Telemetry: 437.050 MHz 1200 bps .AX25 AFSK Payload: 437.1125 MHz 1200/2400/4800 bps .AX25 AFSK, SSTV, AUDIO, TEXT
RS6S (aka SWSU-55 No. 8 (SWGU No. 12)) Telemetry: 437.050 MHz 1200 bps AX.25 AFSK Payload: 437.000 MHz 1200/2400/4800 bps AX.25 AFSK, SSTV, AUDIO, TEXT
RS9S (aka Tsiolkovsky-Ryazan 1) Telemetry: 437.050 MHz 1200 bps AX.25 AFSK Payload: 437.025 MHz 1200 bps AX.25 AFSK, SSTV, AUDIO, TEXT
RS12S (aka Tsiolkovsky-Ryazan 2) Telemetry: 437.050 MHz 1200 bps AX.25 AFSK Payload: 437.0125 MHz 1200 bps AX.25 AFSK, SSTV, AUDIO, TEXT
73, Nico PA0DLO
What amateur radio capabilities/experiments are these adding to the community? The radios seem capable but monoband. Will they do SSTV experiments? Packet repeaters?
On Thu, Jul 21, 2022, 09:22 Nico Janssen hamsat@xs4all.nl wrote:
On July 21 Russian cosmonaut Oleg Artemyev and ESA astronaut Samantha Cristoforetti will carry out an EVA outside the ISS. During that 7 hours long EVA, starting at around 14:00 UTC, the spacewalkers are planned to deploy ten Russian cubesats into orbit under the program of the space experiment "Radioskaf". The EVA, including the deployment of the cubesats, can be witnessed live on NASA-TV.
RS10S (aka SWSU-55 No. 1 & R-390 (SWGU No. 5)) Telemetry: 437.050 MHz 1200 bps AX.25 AFSK Payload: 437.050 MHz 1200/2400/4800 bps AX.25 AFSK, SSTV, AUDIO, TEXT
RS11S (aka SWSU-55 No. 2 (SWGU No. 6)) Telemetry: 437.050 MHz 1200 bps AX.25 AFSK Payload: 437.062 MHz 1200/2400/4800 bps AX.25 AFSK, SSTV, AUDIO, TEXT
RS1S (aka SWSU-55 No. 3 (SWGU No. 7)) Telemetry: 437.050 MHz 1200 bps AX.25 AFSK Payload: 437.075 MHz 1200/2400/4800 bps AX.25 AFSK, SSTV, AUDIO, TEXT
RS2S (aka SWSU-55 No. 4 (SWGU No. 8)) Telemetry: 437.050 MHz 1200 bps AX.25 AFSK Payload: 437.082 MHz 1200/2400/4800 bps AX.25 AFSK, SSTV, AUDIO, TEXT
RS3S (aka SWSU-55 No. 5 (SWGU No. 9)) Telemetry: 437.050 MHz 1200 bps AX.25 AFSK Payload: 437.100 MHz 1200/2400/4800 bps AX.25 AFSK, SSTV, AUDIO, TEXT
RS4S (aka SWSU-55 No. 6 (SWGU No. 10)) Telemetry: 437.050 MHz 1200 bps AX.25 AFSK Payload: 437.087 MHz 1200/2400/4800 bps AX.25 AFSK, SSTV, AUDIO, TEXT
RS5S (aka SWSU-55 No. 7 & R-390 (SWGU No. 11)) Telemetry: 437.050 MHz 1200 bps .AX25 AFSK Payload: 437.1125 MHz 1200/2400/4800 bps .AX25 AFSK, SSTV, AUDIO, TEXT
RS6S (aka SWSU-55 No. 8 (SWGU No. 12)) Telemetry: 437.050 MHz 1200 bps AX.25 AFSK Payload: 437.000 MHz 1200/2400/4800 bps AX.25 AFSK, SSTV, AUDIO, TEXT
RS9S (aka Tsiolkovsky-Ryazan 1) Telemetry: 437.050 MHz 1200 bps AX.25 AFSK Payload: 437.025 MHz 1200 bps AX.25 AFSK, SSTV, AUDIO, TEXT
RS12S (aka Tsiolkovsky-Ryazan 2) Telemetry: 437.050 MHz 1200 bps AX.25 AFSK Payload: 437.0125 MHz 1200 bps AX.25 AFSK, SSTV, AUDIO, TEXT
73, Nico PA0DLO
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Some further information:
"The mission of the satellites of the SWSU series: Creation of a peer-to-peer information network. Retransmission and parallel transmission to the ground monitoring station is organized within the network. - study of the Earth's magnetic field - measurement of radio noise in outer space - transmission of photos (SSTV) and voice messages (AUDIO) to radio amateurs around the world. Each satellite will have its own personal phrase, which is translated into 8 different languages.
The Tsiolkovsky-Ryazan 1/2 satellites carry special radio transmitting equipment designed to perform the scientific task of calibrating the sensitivity of the radio telescopes of the Pushchino Radio Astronomy Observatory of the Astro-Space Center of the Physical Institute P.N. Lebedev of the Russian Academy of Sciences (PRAO ACC FIAN, www.prao.ru). Also, these satellites can emit specialized radio signals to study the effects of radio wave propagation through the ionosphere using radio receiving equipment, which is supposed to be manufactured at the Russian State Technical University and used as part of the PRAO ACC FIAN radio telescopes."
73, Nico PA0DLO
On 21-07-2022 16:33, Robert Meade wrote:
What amateur radio capabilities/experiments are these adding to the community? The radios seem capable but monoband. Will they do SSTV experiments? Packet repeaters?
On Thu, Jul 21, 2022, 09:22 Nico Janssen hamsat@xs4all.nl wrote:
On July 21 Russian cosmonaut Oleg Artemyev and ESA astronaut Samantha Cristoforetti will carry out an EVA outside the ISS. During that 7 hours long EVA, starting at around 14:00 UTC, the spacewalkers are planned to deploy ten Russian cubesats into orbit under the program of the space experiment "Radioskaf". The EVA, including the deployment of the cubesats, can be witnessed live on NASA-TV. RS10S (aka SWSU-55 No. 1 & R-390 (SWGU No. 5)) Telemetry: 437.050 MHz 1200 bps AX.25 AFSK Payload: 437.050 MHz 1200/2400/4800 bps AX.25 AFSK, SSTV, AUDIO, TEXT RS11S (aka SWSU-55 No. 2 (SWGU No. 6)) Telemetry: 437.050 MHz 1200 bps AX.25 AFSK Payload: 437.062 MHz 1200/2400/4800 bps AX.25 AFSK, SSTV, AUDIO, TEXT RS1S (aka SWSU-55 No. 3 (SWGU No. 7)) Telemetry: 437.050 MHz 1200 bps AX.25 AFSK Payload: 437.075 MHz 1200/2400/4800 bps AX.25 AFSK, SSTV, AUDIO, TEXT RS2S (aka SWSU-55 No. 4 (SWGU No. 8)) Telemetry: 437.050 MHz 1200 bps AX.25 AFSK Payload: 437.082 MHz 1200/2400/4800 bps AX.25 AFSK, SSTV, AUDIO, TEXT RS3S (aka SWSU-55 No. 5 (SWGU No. 9)) Telemetry: 437.050 MHz 1200 bps AX.25 AFSK Payload: 437.100 MHz 1200/2400/4800 bps AX.25 AFSK, SSTV, AUDIO, TEXT RS4S (aka SWSU-55 No. 6 (SWGU No. 10)) Telemetry: 437.050 MHz 1200 bps AX.25 AFSK Payload: 437.087 MHz 1200/2400/4800 bps AX.25 AFSK, SSTV, AUDIO, TEXT RS5S (aka SWSU-55 No. 7 & R-390 (SWGU No. 11)) Telemetry: 437.050 MHz 1200 bps .AX25 AFSK Payload: 437.1125 MHz 1200/2400/4800 bps .AX25 AFSK, SSTV, AUDIO, TEXT RS6S (aka SWSU-55 No. 8 (SWGU No. 12)) Telemetry: 437.050 MHz 1200 bps AX.25 AFSK Payload: 437.000 MHz 1200/2400/4800 bps AX.25 AFSK, SSTV, AUDIO, TEXT RS9S (aka Tsiolkovsky-Ryazan 1) Telemetry: 437.050 MHz 1200 bps AX.25 AFSK Payload: 437.025 MHz 1200 bps AX.25 AFSK, SSTV, AUDIO, TEXT RS12S (aka Tsiolkovsky-Ryazan 2) Telemetry: 437.050 MHz 1200 bps AX.25 AFSK Payload: 437.0125 MHz 1200 bps AX.25 AFSK, SSTV, AUDIO, TEXT 73, Nico PA0DLO ----------------------------------------------------------- Sent via AMSAT-BB(a)amsat.org <http://amsat.org>. 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. Acceptable Use and Privacy Policies available at https://www.amsat.org/about-amsat/ View archives of this mailing list at https://mailman.amsat.org/hyperkitty/list/amsat-bb@amsat.org To unsubscribe send an email to amsat-bb-leave(a)amsat.org <http://amsat.org> Manage all of your AMSAT-NA mailing list preferences at https://mailman.amsat.org
In other words, a bunch of new satellites that have essentially nothing to do with Amateur Radio other than tying up a chuck of our precious spectrum. I have little doubt that the only reason the third bullet item is there is to be able to claim an Amateur Radio function and therefore be able to justify using Amateur spectrum for an otherwise completely non-Amateur related mission.
If I'm reading that wrong, please correct me..
Jim - K6CCC
-----Original Message----- From: "Nico Janssen" hamsat@xs4all.nl Sent: Thursday, July 21, 2022 07:54 To: "Robert Meade" rjm27trekkie@gmail.com Cc: "Amsat BB" amsat-bb@amsat.org Subject: [AMSAT-BB] Re: Ten Russian cubesats to be deployed from the ISS
"The mission of the satellites of the SWSU series: Creation of a peer-to-peer information network. Retransmission and parallel transmission to the ground monitoring station is organized within the network. - study of the Earth's magnetic field - measurement of radio noise in outer space - transmission of photos (SSTV) and voice messages (AUDIO) to radio amateurs around the world. Each satellite will have its own personal phrase, which is translated into 8 different languages.
The Tsiolkovsky-Ryazan 1/2 satellites carry special radio transmitting equipment designed to perform the scientific task of calibrating the sensitivity of the radio telescopes of the Pushchino Radio Astronomy Observatory of the Astro-Space Center of the Physical Institute P.N. Lebedev of the Russian Academy of Sciences (PRAO ACC FIAN, www.prao.ru). Also, these satellites can emit specialized radio signals to study the effects of radio wave propagation through the ionosphere using radio receiving equipment, which is supposed to be manufactured at the Russian State Technical University and used as part of the PRAO ACC FIAN radio telescopes."
On 7/21/22 10:34, jim@k6ccc.org wrote:
In other words, a bunch of new satellites that have essentially nothing to do with Amateur Radio other than tying up a chuck of our precious spectrum. I have little doubt that the only reason the third bullet item is there is to be able to claim an Amateur Radio function and therefore be able to justify using Amateur spectrum for an otherwise completely non-Amateur related mission.
Sadly, I'm forced to agree with you, Jim. These satellites should not have been coordinated within the amateur spectrum.
We don't need more transmit-only boxes in orbit, at least in our allocation. We especially don't need commercial interests (even if they hide under the guise of "University") utilizing it.
Only amateur two-way satellites (analog or digital/packet) should be granted coordination. Then they are useful to the amateur radio community.
73,
--- Zach N0ZGO
Fortunately they we thrown out of the ISS so won't stay up there long.
On 22/07/2022 10:18 EDT Zach Metzinger zmetzing@pobox.com wrote: Sadly, I'm forced to agree with you, Jim. These satellites should not have been coordinated within the amateur spectrum.
We don't need more transmit-only boxes in orbit, at least in our allocation. We especially don't need commercial interests (even if they hide under the guise of "University") utilizing it.
Only amateur two-way satellites (analog or digital/packet) should be granted coordination. Then they are useful to the amateur radio community.
73,
--- Zach N0ZGO
Is there any idea of when pass prediction info will be released?
Wayne KB4DSF
On Fri, Jul 22, 2022 at 11:02 AM Nigel A. Gunn G8IFF/W8IFF nigel@ngunn.net wrote:
Fortunately they we thrown out of the ISS so won't stay up there long.
On 22/07/2022 10:18 EDT Zach Metzinger zmetzing@pobox.com wrote: Sadly, I'm forced to agree with you, Jim. These satellites should not have been coordinated within the amateur spectrum.
We don't need more transmit-only boxes in orbit, at least in our allocation. We especially don't need commercial interests (even if they hide under the guise of "University") utilizing it.
Only amateur two-way satellites (analog or digital/packet) should be granted coordination. Then they are useful to the amateur radio
community.
73,
--- Zach N0ZGO
Sent via AMSAT-BB(a)amsat.org. 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. Acceptable Use and Privacy Policies available at https://www.amsat.org/about-amsat/
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You tried Space-Track?
On 22/07/2022 11:26 EDT Wayne Greene wayne.greene489@gmail.com wrote:
Is there any idea of when pass prediction info will be released?
Wayne KB4DSF
On Fri, Jul 22, 2022 at 11:02 AM Nigel A. Gunn G8IFF/W8IFF nigel@ngunn.net wrote:
Fortunately they we thrown out of the ISS so won't stay up there long.
On 22/07/2022 10:18 EDT Zach Metzinger zmetzing@pobox.com wrote: Sadly, I'm forced to agree with you, Jim. These satellites should not have been coordinated within the amateur spectrum.
We don't need more transmit-only boxes in orbit, at least in our allocation. We especially don't need commercial interests (even if they hide under the guise of "University") utilizing it.
Only amateur two-way satellites (analog or digital/packet) should be granted coordination. Then they are useful to the amateur radio community.
73,
--- Zach N0ZGO
Sent via AMSAT-BB(a)amsat.org (http://amsat.org). 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. Acceptable Use and Privacy Policies available at https://www.amsat.org/about-amsat/
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--
Wayne Greene
Nigel A. Gunn, ///shoulders.outwards.resolutions tel +1-937-971-0366 Amateur Radio G8IFF W8IFF and GMRS WRBV701, e-mail nigel@ngunn.net www http://www.ngunn.net
Right now, just use the ISS. They’ll be close enough for a day or two.
73,
Paul, N8HM
On Fri, Jul 22, 2022 at 11:29 Nigel A. Gunn G8IFF/W8IFF nigel@ngunn.net wrote:
You tried Space-Track?
On 22/07/2022 11:26 EDT Wayne Greene wayne.greene489@gmail.com wrote:
Is there any idea of when pass prediction info will be released?
Wayne KB4DSF
On Fri, Jul 22, 2022 at 11:02 AM Nigel A. Gunn G8IFF/W8IFF <
nigel@ngunn.net> wrote:
Fortunately they we thrown out of the ISS so won't stay up there long.
On 22/07/2022 10:18 EDT Zach Metzinger zmetzing@pobox.com wrote: Sadly, I'm forced to agree with you, Jim. These satellites should
not
have been coordinated within the amateur spectrum.
We don't need more transmit-only boxes in orbit, at least in our allocation. We especially don't need commercial interests (even if
they
hide under the guise of "University") utilizing it.
Only amateur two-way satellites (analog or digital/packet) should
be
granted coordination. Then they are useful to the amateur radio
community.
73,
--- Zach N0ZGO
Sent via AMSAT-BB(a)amsat.org (http://amsat.org). 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.
Acceptable Use and Privacy Policies available at
https://www.amsat.org/about-amsat/
View archives of this mailing list at https://mailman.amsat.org/hyperkitty/list/amsat-bb@amsat.org To unsubscribe send an email to amsat-bb-leave(a)amsat.org (
Manage all of your AMSAT-NA mailing list preferences at
--
Wayne Greene
Nigel A. Gunn, ///shoulders.outwards.resolutions tel +1-937-971-0366 Amateur Radio G8IFF W8IFF and GMRS WRBV701, e-mail nigel@ngunn.net www http://www.ngunn.net
Sent via AMSAT-BB(a)amsat.org. 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. Acceptable Use and Privacy Policies available at https://www.amsat.org/about-amsat/
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Regular ISS predictions will be pretty accurate for several days. They were released by hand so the delta-V imparted will be pretty low.
de KM1P Joe
ok. I'll try the ISS predictions, then. I wasn't able to find anything in space track. Of course, I might have been doing something wrong with my searches.
On Fri, Jul 22, 2022 at 11:32 AM Joseph B. Fitzgerald < jfitzgerald@alum.wpi.edu> wrote:
Regular ISS predictions will be pretty accurate for several days. They were released by hand so the delta-V imparted will be pretty low.
de KM1P Joe
When a satellite is dispensed from a mothership like the ISS, the orbit cant really go too far away due to the nature of orbital mechanics. The iss and the cubesat orbits will have to intersect at least twice. Is there a more precise modeling of this?
On Fri, Jul 22, 2022, 9:19 PM Wayne Greene wayne.greene489@gmail.com wrote:
ok. I'll try the ISS predictions, then. I wasn't able to find anything in space track. Of course, I might have been doing something wrong with my searches.
On Fri, Jul 22, 2022 at 11:32 AM Joseph B. Fitzgerald < jfitzgerald@alum.wpi.edu> wrote:
Regular ISS predictions will be pretty accurate for several days. They were released by hand so the delta-V imparted will be pretty low.
de KM1P Joe
-- Wayne Greene
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Hello,
A standard exercise in classical mechanics is to show that when an object is released in the right way from a satellite that is in a circular orbit, that object can end up appearing to orbit the main satellite. The shape of the orbit as seen in the reference frame of the main satellite is an ellipse. Unlike normal Keplerian orbits, where the attracting mass is at one focus of the ellipse, the main satellite is at the geometric center of the elliptical orbit.
73, Dan K2QM
P.S. Normally the sub satellites are taken to be beer cans, but this analysis should also work for Cubesats.
From: Ashhar Farhan farhanbox@gmail.com Sent: Friday, July 22, 2022 11:57 AM To: wayne.greene489@gmail.com Cc: Joseph B. Fitzgerald jfitzgerald@alum.wpi.edu; AMSAT BB amsat-bb@amsat.org Subject: [AMSAT-BB] Re: Ten Russian cubesats to be deployed from the ISS
When a satellite is dispensed from a mothership like the ISS, the orbit cant really go too far away due to the nature of orbital mechanics. The iss and the cubesat orbits will have to intersect at least twice. Is there a more precise modeling of this?
On Fri, Jul 22, 2022, 9:19 PM Wayne Greene <wayne.greene489@gmail.commailto:wayne.greene489@gmail.com> wrote: ok. I'll try the ISS predictions, then. I wasn't able to find anything in space track. Of course, I might have been doing something wrong with my searches.
On Fri, Jul 22, 2022 at 11:32 AM Joseph B. Fitzgerald <jfitzgerald@alum.wpi.edumailto:jfitzgerald@alum.wpi.edu> wrote: Regular ISS predictions will be pretty accurate for several days. They were released by hand so the delta-V imparted will be pretty low.
de KM1P Joe
-- Wayne Greene
-----------------------------------------------------------
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Dan, This is interesting, so satellites that are launched together will stay together! They will always be in a dynamic constellation with each other I suppose with an anomaly that will be interesting to calculate. I guess kerbel can simulate this. - f
On Fri, Jul 22, 2022, 10:37 PM Daniel R. Marlow marlow@princeton.edu wrote:
Hello,
A standard exercise in classical mechanics is to show that when anobject is released in the right way from a satellite that is in a circular orbit, that object can end up appearing to orbit the main satellite. The shape of the orbit as seen in the reference frame of the main satellite is an ellipse. Unlike normal Keplerian orbits, where the attracting mass is at one focus of the ellipse, the main satellite is at the geometric center of the elliptical orbit.
73,
Dan K2QM
P.S. Normally the sub satellites are taken to be beer cans, but this analysis should also work for Cubesats.
*From:* Ashhar Farhan farhanbox@gmail.com *Sent:* Friday, July 22, 2022 11:57 AM *To:* wayne.greene489@gmail.com *Cc:* Joseph B. Fitzgerald jfitzgerald@alum.wpi.edu; AMSAT BB < amsat-bb@amsat.org> *Subject:* [AMSAT-BB] Re: Ten Russian cubesats to be deployed from the ISS
When a satellite is dispensed from a mothership like the ISS, the orbit cant really go too far away due to the nature of orbital mechanics. The iss and the cubesat orbits will have to intersect at least twice. Is there a more precise modeling of this?
On Fri, Jul 22, 2022, 9:19 PM Wayne Greene wayne.greene489@gmail.com wrote:
ok. I'll try the ISS predictions, then. I wasn't able to find anything in space track. Of course, I might have been doing something wrong with my searches.
On Fri, Jul 22, 2022 at 11:32 AM Joseph B. Fitzgerald < jfitzgerald@alum.wpi.edu> wrote:
Regular ISS predictions will be pretty accurate for several days. They were released by hand so the delta-V imparted will be pretty low.
de KM1P Joe
--
Wayne Greene
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This is awfully interesting! Does the analysis assume a tiny amount of gravitational attraction between the ISS and the cubesat?
I think we are pretty sure that when multiple cubesats are released from a single P-POD one a ride-share rocket they have slightly different velocities and even if they stay in ~the same plane and altitude, they do separate in time. Just wondering how that all fits. (I suppose one difference is that the P-POD carrying stage will like change its orbit after the release).
Thanks!
On Fri, Jul 22, 2022 at 1:08 PM Daniel R. Marlow marlow@princeton.edu wrote:
Hello,
A standard exercise in classical mechanics is to show that when anobject is released in the right way from a satellite that is in a circular orbit, that object can end up appearing to orbit the main satellite. The shape of the orbit as seen in the reference frame of the main satellite is an ellipse. Unlike normal Keplerian orbits, where the attracting mass is at one focus of the ellipse, the main satellite is at the geometric center of the elliptical orbit.
73,
Dan K2QM
P.S. Normally the sub satellites are taken to be beer cans, but this analysis should also work for Cubesats.
*From:* Ashhar Farhan farhanbox@gmail.com *Sent:* Friday, July 22, 2022 11:57 AM *To:* wayne.greene489@gmail.com *Cc:* Joseph B. Fitzgerald jfitzgerald@alum.wpi.edu; AMSAT BB < amsat-bb@amsat.org> *Subject:* [AMSAT-BB] Re: Ten Russian cubesats to be deployed from the ISS
When a satellite is dispensed from a mothership like the ISS, the orbit cant really go too far away due to the nature of orbital mechanics. The iss and the cubesat orbits will have to intersect at least twice. Is there a more precise modeling of this?
On Fri, Jul 22, 2022, 9:19 PM Wayne Greene wayne.greene489@gmail.com wrote:
ok. I'll try the ISS predictions, then. I wasn't able to find anything in space track. Of course, I might have been doing something wrong with my searches.
On Fri, Jul 22, 2022 at 11:32 AM Joseph B. Fitzgerald < jfitzgerald@alum.wpi.edu> wrote:
Regular ISS predictions will be pretty accurate for several days. They were released by hand so the delta-V imparted will be pretty low.
de KM1P Joe
--
Wayne Greene
Sent via AMSAT-BB(a)amsat.org https://nam12.safelinks.protection.outlook.com/?url=http%3A%2F%2Famsat.org%2F&data=05%7C01%7Cmarlow%40princeton.edu%7Cdbf74306ffd1435b752b08da6bfae515%7C2ff601167431425db5af077d7791bda4%7C0%7C0%7C637941022582034325%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=8PJ%2By7GdVEcnWVYBs4N8H9zk7E%2B6WaG1nsxa3bluV2c%3D&reserved=0. 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. Acceptable Use and Privacy Policies available at https://www.amsat.org/about-amsat/ https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.amsat.org%2Fabout-amsat%2F&data=05%7C01%7Cmarlow%40princeton.edu%7Cdbf74306ffd1435b752b08da6bfae515%7C2ff601167431425db5af077d7791bda4%7C0%7C0%7C637941022582034325%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=pefrbh3EujWqmf8ZcovN9UTgNsAkxF1TI2na%2FYL8vI0%3D&reserved=0
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Hi,
The analysis is idealized (assume that the cow is a sphere) and assumes zero attraction between the ISS and the Cubesats. It also neglects drag forces and possible effects of the Moon, Sun, and other planets.
The basic idea is that one can think of an elliptical orbit as being a radial oscillation about a nominal circular orbit. It can be shown* that the period of the radial oscillation is equal to the orbital period (if that weren't the case, elliptical orbits would not be "closed."). From the point of view of an observer on a platform that is undergoing the circular orbit (we will assume this for the ISS), the Cubesat appears to move back and forth between a slightly lower and slightly higher orbit. It moves a bit faster when it is at its lowest point, and thus gets ahead of the ISS. When it is at its highest point, it moves slower and falls backward. The net effect is the aforementioned elliptical orbit.
73, Dan K2QM
* If there is interest, I can probably dig up my old notes on this problem.
From: Burns Fisher wb1fj-bb@fisher.cc Sent: Friday, July 22, 2022 3:56 PM To: Daniel R. Marlow marlow@princeton.edu Cc: Ashhar Farhan farhanbox@gmail.com; wayne.greene489@gmail.com; Joseph B. Fitzgerald jfitzgerald@alum.wpi.edu; AMSAT BB amsat-bb@amsat.org Subject: Re: [AMSAT-BB] Re: Ten Russian cubesats to be deployed from the ISS
This is awfully interesting! Does the analysis assume a tiny amount of gravitational attraction between the ISS and the cubesat?
I think we are pretty sure that when multiple cubesats are released from a single P-POD one a ride-share rocket they have slightly different velocities and even if they stay in ~the same plane and altitude, they do separate in time. Just wondering how that all fits. (I suppose one difference is that the P-POD carrying stage will like change its orbit after the release).
Thanks!
On Fri, Jul 22, 2022 at 1:08 PM Daniel R. Marlow <marlow@princeton.edumailto:marlow@princeton.edu> wrote: Hello,
A standard exercise in classical mechanics is to show that when an object is released in the right way from a satellite that is in a circular orbit, that object can end up appearing to orbit the main satellite. The shape of the orbit as seen in the reference frame of the main satellite is an ellipse. Unlike normal Keplerian orbits, where the attracting mass is at one focus of the ellipse, the main satellite is at the geometric center of the elliptical orbit.
73, Dan K2QM
P.S. Normally the sub satellites are taken to be beer cans, but this analysis should also work for Cubesats.
From: Ashhar Farhan <farhanbox@gmail.commailto:farhanbox@gmail.com> Sent: Friday, July 22, 2022 11:57 AM To: wayne.greene489@gmail.commailto:wayne.greene489@gmail.com Cc: Joseph B. Fitzgerald <jfitzgerald@alum.wpi.edumailto:jfitzgerald@alum.wpi.edu>; AMSAT BB <amsat-bb@amsat.orgmailto:amsat-bb@amsat.org> Subject: [AMSAT-BB] Re: Ten Russian cubesats to be deployed from the ISS
When a satellite is dispensed from a mothership like the ISS, the orbit cant really go too far away due to the nature of orbital mechanics. The iss and the cubesat orbits will have to intersect at least twice. Is there a more precise modeling of this?
On Fri, Jul 22, 2022, 9:19 PM Wayne Greene <wayne.greene489@gmail.commailto:wayne.greene489@gmail.com> wrote: ok. I'll try the ISS predictions, then. I wasn't able to find anything in space track. Of course, I might have been doing something wrong with my searches.
On Fri, Jul 22, 2022 at 11:32 AM Joseph B. Fitzgerald <jfitzgerald@alum.wpi.edumailto:jfitzgerald@alum.wpi.edu> wrote: Regular ISS predictions will be pretty accurate for several days. They were released by hand so the delta-V imparted will be pretty low.
de KM1P Joe
-- Wayne Greene
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What actually happens in real life when a satellite is released from the ISS is the following.
The satellite is pushed, at a relatively low velocity, towards the rear of the ISS (i.e. opposite to the flight direction) at a certain angle below the horizon. This is done to prevent the satellite from colliding with the ISS in a later orbit. Because using this maneuver the satellite will lose energy, when compared to the energy the satellite had when it was still attached to the ISS. As a result, the satellite will start falling to a lower orbit, and therefore move away from the ISS. Additionally, the satellite has a higher drag factor, causing further loss of energy. So the satellite will soon be in a lower orbit, resulting in a higher velocity than the ISS. Therefore the satellite will get ahead of the ISS within days and move away from the ISS further and further. And that is when you need to start using separate TLEs for the satellite.
73, Nico PA0DLO
On 22-07-2022 22:17, Daniel R. Marlow wrote:
Hi,
The analysis is idealized (assume that the cow is a sphere) and assumes zero attraction between the ISS and the Cubesats. It also neglects drag forces and possible effects of the Moon, Sun, and other planets.
The basic idea is that one can think of an elliptical orbit as being a radial oscillation about a nominal circular orbit. It can be shown* that the period of the radial oscillation is equal to the orbital period (if that weren’t the case, elliptical orbits would not be “closed.”). From the point of view of an observer on a platform that is undergoing the circular orbit (we will assume this for the ISS), the Cubesat appears to move back and forth between a slightly lower and slightly higher orbit. It moves a bit faster when it is at its lowest point, and thus gets ahead of the ISS. When it is at its highest point, it moves slower and falls backward. The net effect is the aforementioned elliptical orbit.
73, Dan K2QM
- If there is interest, I can probably dig up my old notes on this
problem.
*From:* Burns Fisher wb1fj-bb@fisher.cc *Sent:* Friday, July 22, 2022 3:56 PM *To:* Daniel R. Marlow marlow@princeton.edu *Cc:* Ashhar Farhan farhanbox@gmail.com; wayne.greene489@gmail.com; Joseph B. Fitzgerald jfitzgerald@alum.wpi.edu; AMSAT BB amsat-bb@amsat.org *Subject:* Re: [AMSAT-BB] Re: Ten Russian cubesats to be deployed from the ISS
This is awfully interesting! Does the analysis assume a tiny amount of gravitational attraction between the ISS and the cubesat?
I think we are pretty sure that when multiple cubesats are released from a single P-POD one a ride-share rocket they have slightly different velocities and even if they stay in ~the same plane and altitude, they do separate in time. Just wondering how that all fits. (I suppose one difference is that the P-POD carrying stage will like change its orbit after the release).
Thanks!
On Fri, Jul 22, 2022 at 1:08 PM Daniel R. Marlow marlow@princeton.edu wrote:
Hello, A standard exercise in classical mechanics is to show that when an object is released in the right way from a satellite that is in a circular orbit, that object can end up appearing to orbit the main satellite. The shape of the orbit as seen in the reference frame of the main satellite is an ellipse. Unlike normal Keplerian orbits, where the attracting mass is at one focus of the ellipse, the main satellite is at the geometric center of the elliptical orbit. 73, Dan K2QM P.S. Normally the sub satellites are taken to be beer cans, but this analysis should also work for Cubesats. *From:* Ashhar Farhan <farhanbox@gmail.com> *Sent:* Friday, July 22, 2022 11:57 AM *To:* wayne.greene489@gmail.com *Cc:* Joseph B. Fitzgerald <jfitzgerald@alum.wpi.edu>; AMSAT BB <amsat-bb@amsat.org> *Subject:* [AMSAT-BB] Re: Ten Russian cubesats to be deployed from the ISS When a satellite is dispensed from a mothership like the ISS, the orbit cant really go too far away due to the nature of orbital mechanics. The iss and the cubesat orbits will have to intersect at least twice. Is there a more precise modeling of this? On Fri, Jul 22, 2022, 9:19 PM Wayne Greene <wayne.greene489@gmail.com> wrote: ok. I'll try the ISS predictions, then. I wasn't able to find anything in space track. Of course, I might have been doing something wrong with my searches. On Fri, Jul 22, 2022 at 11:32 AM Joseph B. Fitzgerald <jfitzgerald@alum.wpi.edu> wrote: Regular ISS predictions will be pretty accurate for several days. They were released by hand so the delta-V imparted will be pretty low. de KM1P Joe -- Wayne Greene ----------------------------------------------------------- Sent via AMSAT-BB(a)amsat.org <https://nam12.safelinks.protection.outlook.com/?url=http%3A%2F%2Famsat.org%2F&data=05%7C01%7Cmarlow%40princeton.edu%7C86a6c65ea5194ec43b8008da6c1c3fa2%7C2ff601167431425db5af077d7791bda4%7C0%7C0%7C637941165829820720%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=JW7t8kODHYggYn45%2Fm6o3gt4kW1o%2BfRtwj%2B2akT2VTY%3D&reserved=0>. 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. 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Very cool discussion
Sent via the Samsung Galaxy S21 5G, an AT&T 5G smartphone Get Outlook for Androidhttps://aka.ms/AAb9ysg ________________________________ From: Nico Janssen hamsat@xs4all.nl Sent: Friday, July 22, 2022 4:25:48 PM To: Daniel R. Marlow marlow@princeton.edu; Burns Fisher wb1fj-bb@fisher.cc Cc: Ashhar Farhan farhanbox@gmail.com; wayne.greene489@gmail.com wayne.greene489@gmail.com; Joseph B. Fitzgerald jfitzgerald@alum.wpi.edu; AMSAT BB amsat-bb@amsat.org Subject: [AMSAT-BB] Re: Ten Russian cubesats to be deployed from the ISS
What actually happens in real life when a satellite is released from the ISS is the following.
The satellite is pushed, at a relatively low velocity, towards the rear of the ISS (i.e. opposite to the flight direction) at a certain angle below the horizon. This is done to prevent the satellite from colliding with the ISS in a later orbit. Because using this maneuver the satellite will lose energy, when compared to the energy the satellite had when it was still attached to the ISS. As a result, the satellite will start falling to a lower orbit, and therefore move away from the ISS. Additionally, the satellite has a higher drag factor, causing further loss of energy. So the satellite will soon be in a lower orbit, resulting in a higher velocity than the ISS. Therefore the satellite will get ahead of the ISS within days and move away from the ISS further and further. And that is when you need to start using separate TLEs for the satellite.
73, Nico PA0DLO
On 22-07-2022 22:17, Daniel R. Marlow wrote:
Hi,
The analysis is idealized (assume that the cow is a sphere) and assumes zero attraction between the ISS and the Cubesats. It also neglects drag forces and possible effects of the Moon, Sun, and other planets.
The basic idea is that one can think of an elliptical orbit as being a radial oscillation about a nominal circular orbit. It can be shown* that the period of the radial oscillation is equal to the orbital period (if that weren’t the case, elliptical orbits would not be “closed.”). From the point of view of an observer on a platform that is undergoing the circular orbit (we will assume this for the ISS), the Cubesat appears to move back and forth between a slightly lower and slightly higher orbit. It moves a bit faster when it is at its lowest point, and thus gets ahead of the ISS. When it is at its highest point, it moves slower and falls backward. The net effect is the aforementioned elliptical orbit.
73, Dan K2QM
* If there is interest, I can probably dig up my old notes on this problem.
From: Burns Fisher wb1fj-bb@fisher.ccmailto:wb1fj-bb@fisher.cc Sent: Friday, July 22, 2022 3:56 PM To: Daniel R. Marlow marlow@princeton.edumailto:marlow@princeton.edu Cc: Ashhar Farhan farhanbox@gmail.commailto:farhanbox@gmail.com; wayne.greene489@gmail.commailto:wayne.greene489@gmail.com; Joseph B. Fitzgerald jfitzgerald@alum.wpi.edumailto:jfitzgerald@alum.wpi.edu; AMSAT BB amsat-bb@amsat.orgmailto:amsat-bb@amsat.org Subject: Re: [AMSAT-BB] Re: Ten Russian cubesats to be deployed from the ISS
This is awfully interesting! Does the analysis assume a tiny amount of gravitational attraction between the ISS and the cubesat?
I think we are pretty sure that when multiple cubesats are released from a single P-POD one a ride-share rocket they have slightly different velocities and even if they stay in ~the same plane and altitude, they do separate in time. Just wondering how that all fits. (I suppose one difference is that the P-POD carrying stage will like change its orbit after the release).
Thanks!
On Fri, Jul 22, 2022 at 1:08 PM Daniel R. Marlow <marlow@princeton.edumailto:marlow@princeton.edu> wrote:
Hello,
A standard exercise in classical mechanics is to show that when an object is released in the right way from a satellite that is in a circular orbit, that object can end up appearing to orbit the main satellite. The shape of the orbit as seen in the reference frame of the main satellite is an ellipse. Unlike normal Keplerian orbits, where the attracting mass is at one focus of the ellipse, the main satellite is at the geometric center of the elliptical orbit.
73,
Dan K2QM
P.S. Normally the sub satellites are taken to be beer cans, but this analysis should also work for Cubesats.
From: Ashhar Farhan <farhanbox@gmail.commailto:farhanbox@gmail.com> Sent: Friday, July 22, 2022 11:57 AM To: wayne.greene489@gmail.commailto:wayne.greene489@gmail.com Cc: Joseph B. Fitzgerald <jfitzgerald@alum.wpi.edumailto:jfitzgerald@alum.wpi.edu>; AMSAT BB <amsat-bb@amsat.orgmailto:amsat-bb@amsat.org> Subject: [AMSAT-BB] Re: Ten Russian cubesats to be deployed from the ISS
When a satellite is dispensed from a mothership like the ISS, the orbit cant really go too far away due to the nature of orbital mechanics. The iss and the cubesat orbits will have to intersect at least twice. Is there a more precise modeling of this?
On Fri, Jul 22, 2022, 9:19 PM Wayne Greene <wayne.greene489@gmail.commailto:wayne.greene489@gmail.com> wrote:
ok. I'll try the ISS predictions, then. I wasn't able to find anything in space track. Of course, I might have been doing something wrong with my searches.
On Fri, Jul 22, 2022 at 11:32 AM Joseph B. Fitzgerald <jfitzgerald@alum.wpi.edumailto:jfitzgerald@alum.wpi.edu> wrote:
Regular ISS predictions will be pretty accurate for several days. They were released by hand so the delta-V imparted will be pretty low.
de KM1P Joe
--
Wayne Greene
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What actually happens in real life when a satellite is released from the ISS is the following.
The satellite is pushed, at a relatively low velocity, towards the rear of the ISS (i.e. opposite to the flight direction) at a certain angle below the horizon. This is done to prevent the satellite from colliding with the ISS in a later orbit. Because using this maneuver the satellite will lose energy, when compared to the energy the satellite had when it was still attached to the ISS. As a result, the satellite will start falling to a lower orbit, and therefore move away from the ISS. Additionally, the satellite has a higher drag factor, causing further loss of energy. So the satellite will soon be in a lower orbit, resulting in a higher velocity than the ISS. Therefore the satellite will get ahead of the ISS within days and move away from the ISS further and further. And that is when you need to start using separate TLEs for the satellite.
On 22-07-2022 21:56, Burns Fisher wrote:
This is awfully interesting! Does the analysis assume a tiny amount of gravitational attraction between the ISS and the cubesat?
I think we are pretty sure that when multiple cubesats are released from a single P-POD one a ride-share rocket they have slightly different velocities and even if they stay in ~the same plane and altitude, they do separate in time. Just wondering how that all fits. (I suppose one difference is that the P-POD carrying stage will like change its orbit after the release).
Thanks!
On Fri, Jul 22, 2022 at 1:08 PM Daniel R. Marlow marlow@princeton.edu wrote:
Hello, A standard exercise in classical mechanics is to show that when an object is released in the right way from a satellite that is in a circular orbit, that object can end up appearing to orbit the main satellite. The shape of the orbit as seen in the reference frame of the main satellite is an ellipse. Unlike normal Keplerian orbits, where the attracting mass is at one focus of the ellipse, the main satellite is at the geometric center of the elliptical orbit. 73, Dan K2QM P.S. Normally the sub satellites are taken to be beer cans, but this analysis should also work for Cubesats. *From:* Ashhar Farhan <farhanbox@gmail.com> *Sent:* Friday, July 22, 2022 11:57 AM *To:* wayne.greene489@gmail.com *Cc:* Joseph B. Fitzgerald <jfitzgerald@alum.wpi.edu>; AMSAT BB <amsat-bb@amsat.org> *Subject:* [AMSAT-BB] Re: Ten Russian cubesats to be deployed from the ISS When a satellite is dispensed from a mothership like the ISS, the orbit cant really go too far away due to the nature of orbital mechanics. The iss and the cubesat orbits will have to intersect at least twice. Is there a more precise modeling of this? On Fri, Jul 22, 2022, 9:19 PM Wayne Greene <wayne.greene489@gmail.com> wrote: ok. I'll try the ISS predictions, then. I wasn't able to find anything in space track. Of course, I might have been doing something wrong with my searches. On Fri, Jul 22, 2022 at 11:32 AM Joseph B. Fitzgerald <jfitzgerald@alum.wpi.edu> wrote: Regular ISS predictions will be pretty accurate for several days. They were released by hand so the delta-V imparted will be pretty low. de KM1P Joe -- Wayne Greene ----------------------------------------------------------- Sent via AMSAT-BB(a)amsat.org <https://nam12.safelinks.protection.outlook.com/?url=http%3A%2F%2Famsat.org%2F&data=05%7C01%7Cmarlow%40princeton.edu%7Cdbf74306ffd1435b752b08da6bfae515%7C2ff601167431425db5af077d7791bda4%7C0%7C0%7C637941022582034325%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=8PJ%2By7GdVEcnWVYBs4N8H9zk7E%2B6WaG1nsxa3bluV2c%3D&reserved=0>. 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. Acceptable Use and Privacy Policies available at https://www.amsat.org/about-amsat/ <https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.amsat.org%2Fabout-amsat%2F&data=05%7C01%7Cmarlow%40princeton.edu%7Cdbf74306ffd1435b752b08da6bfae515%7C2ff601167431425db5af077d7791bda4%7C0%7C0%7C637941022582034325%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=pefrbh3EujWqmf8ZcovN9UTgNsAkxF1TI2na%2FYL8vI0%3D&reserved=0> View archives of this mailing list at https://mailman.amsat.org/hyperkitty/list/amsat-bb@amsat.org <https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Fmailman.amsat.org%2Fhyperkitty%2Flist%2Famsat-bb%40amsat.org&data=05%7C01%7Cmarlow%40princeton.edu%7Cdbf74306ffd1435b752b08da6bfae515%7C2ff601167431425db5af077d7791bda4%7C0%7C0%7C637941022582034325%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=c6ImXIohcPaNljLR6sdXNPq1CPISxgAwgY7AtyToCpM%3D&reserved=0> To unsubscribe send an email to amsat-bb-leave(a)amsat.org <https://nam12.safelinks.protection.outlook.com/?url=http%3A%2F%2Famsat.org%2F&data=05%7C01%7Cmarlow%40princeton.edu%7Cdbf74306ffd1435b752b08da6bfae515%7C2ff601167431425db5af077d7791bda4%7C0%7C0%7C637941022582034325%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=8PJ%2By7GdVEcnWVYBs4N8H9zk7E%2B6WaG1nsxa3bluV2c%3D&reserved=0> Manage all of your AMSAT-NA mailing list preferences at https://mailman.amsat.org <https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Fmailman.amsat.org%2F&data=05%7C01%7Cmarlow%40princeton.edu%7Cdbf74306ffd1435b752b08da6bfae515%7C2ff601167431425db5af077d7791bda4%7C0%7C0%7C637941022582034325%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=6Td8s86WgEOG7bb1XP%2BLOO2haLORKU6tB7v4Tky6PU8%3D&reserved=0> ----------------------------------------------------------- Sent via AMSAT-BB(a)amsat.org <http://amsat.org>. 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. Acceptable Use and Privacy Policies available at https://www.amsat.org/about-amsat/ View archives of this mailing list at https://mailman.amsat.org/hyperkitty/list/amsat-bb@amsat.org To unsubscribe send an email to amsat-bb-leave(a)amsat.org <http://amsat.org> Manage all of your AMSAT-NA mailing list preferences at https://mailman.amsat.org
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Zach,
I fully agree with you that all satellites on HAM satellites should be coordinated to avoid interference to other birds and ensure also that the frequency is clean but also that it as some benefit for the community. The IARU Coordination Committee is very efficient and provide also advices and very helpful (personal experience for MO-112).
However, its is difficult to enforce as ITU does not coordinate in the HAM bands, the local regulator in any country may give the OK for frequency use for satellites in the HAM band without caring about possible interference. I guess the best solution to avoid encroachment on our bands is that all HAM associations in all countries do police the use of HAM frequencies and do representation that the IARU coordination is a must in this case the Russian Amateur Radio Union should have voiced their stand to the local regulator, more ensure that the HAM community is benefiting also.
My one cent input.
73
Jean Marc (3B8DU)
On Jul 22, 2022, at 7:00 PM, Nigel A. Gunn G8IFF/W8IFF nigel@ngunn.net wrote:
Fortunately they we thrown out of the ISS so won't stay up there long.
On 22/07/2022 10:18 EDT Zach Metzinger zmetzing@pobox.com wrote: Sadly, I'm forced to agree with you, Jim. These satellites should not have been coordinated within the amateur spectrum.
We don't need more transmit-only boxes in orbit, at least in our allocation. We especially don't need commercial interests (even if they hide under the guise of "University") utilizing it.
Only amateur two-way satellites (analog or digital/packet) should be granted coordination. Then they are useful to the amateur radio community.
73,
--- Zach N0ZGO
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Making good progress on getting back on sats. Got the satPC32 working and rig and rotor working too and can hear QSO on a few sats. So the bigger problem is now is how do I find myself.
In earlier times when you had 2 rigs one would change to cw and in a few beeps would find themselves. Now I have a IC-9100 and I have not found a way to do that so now what..... If I quit the auto I can hear me but go back and try to change the steps still cant hear me.
Any quick ideas one can share
use a sdr on rx with at least 96khz bw. a simple rtl-sdr will do the trick. 73
ed py2rn On Saturday, July 23, 2022 at 04:39:09 PM GMT-3, Bill Booth ve3nxk@gmail.com wrote:
Making good progress on getting back on sats. Got the satPC32 working and rig and rotor working too and can hear QSO on a few sats. So the bigger problem is now is how do I find myself.
In earlier times when you had 2 rigs one would change to cw and in a few beeps would find themselves. Now I have a IC-9100 and I have not found a way to do that so now what..... If I quit the auto I can hear me but go back and try to change the steps still cant hear me.
Any quick ideas one can share
You don't need an SDR. Re-read the satellite section of the IC-9100 manual. Page 154. -- Mark D. Johns, KØJM AMSAT Ambassador & News Service Editor Brooklyn Park, MN USA EN35hd ----------------------------------------------- "Heaven goes by favor; if it went by merit, you would stay out and your dog would go in." ---Mark Twain
On Sat, Jul 23, 2022 at 2:39 PM Bill Booth ve3nxk@gmail.com wrote:
Making good progress on getting back on sats. Got the satPC32 working and rig and rotor working too and can hear QSO on a few sats. So the bigger problem is now is how do I find myself.
In earlier times when you had 2 rigs one would change to cw and in a few beeps would find themselves. Now I have a IC-9100 and I have not found a way to do that so now what..... If I quit the auto I can hear me but go back and try to change the steps still cant hear me.
Any quick ideas one can share
-- Bill Booth VE3NXK Sundridge ON, Canada 79.23.37 W x 45.46.18 N FN05ns
Visit my weather WebCam at http://www.almaguin.com/wxcurrent/weather.html
Organ and Tissue Donation - The Gift of Life Talk to your family. Your decision can make a difference.
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Going to be much happier if you do. Believe me :) 73 ed py2rn On Saturday, July 23, 2022 at 05:37:52 PM GMT-3, Mark Johns, K0JM k0jm.mark@gmail.com wrote:
You don't need an SDR. Re-read the satellite section of the IC-9100 manual. Page 154. -- Mark D. Johns, KØJM AMSAT Ambassador & News Service Editor Brooklyn Park, MN USA EN35hd -----------------------------------------------"Heaven goes by favor; if it went by merit, you would stay out and your dog would go in." ---Mark Twain
On Sat, Jul 23, 2022 at 2:39 PM Bill Booth ve3nxk@gmail.com wrote:
Making good progress on getting back on sats. Got the satPC32 working and rig and rotor working too and can hear QSO on a few sats. So the bigger problem is now is how do I find myself.
In earlier times when you had 2 rigs one would change to cw and in a few beeps would find themselves. Now I have a IC-9100 and I have not found a way to do that so now what..... If I quit the auto I can hear me but go back and try to change the steps still cant hear me.
Any quick ideas one can share
Hi Bill,
If you're using SatPC32, you can adjust the stored frequency information in your Doppler.SQF file for each bird so the uplink puts you on a spot you can hear on the downlink each time you work a bird. Some have "thermal drift" so you can only get close (meaning, the exact offset may change as the bird temperature(s) change). Most don't vary much and let you get on the money for future passes.
Key is use the CAT menu, and the top/left settings to adjust your downlink or uplink so you can hear yourself. I usually keep my uplink fixed and adjust the downlink until I hear myself. Keep CAT control ON, use your mouse to click on the triangles to move your up/downlinks to match, and then store it... You can either write down what is the offset and manually edit the Doppler.SQF or some of the buttons on that CAT menu allow you save what you have in operation, to the Doppler.SQF file.
Not exactly step by step instructions, but figuring it out is at least half of the fun, right? :)
73, Mark N8MH
Mark L. Hammond [N8MH] AMSAT Director and Command Station
On Sat, Jul 23, 2022 at 4:39 PM Mark Johns, K0JM k0jm.mark@gmail.com wrote:
You don't need an SDR. Re-read the satellite section of the IC-9100 manual. Page 154. -- Mark D. Johns, KØJM AMSAT Ambassador & News Service Editor Brooklyn Park, MN USA EN35hd
"Heaven goes by favor; if it went by merit, you would stay out and your dog would go in." ---Mark Twain
On Sat, Jul 23, 2022 at 2:39 PM Bill Booth ve3nxk@gmail.com wrote:
Making good progress on getting back on sats. Got the satPC32 working and rig and rotor working too and can hear QSO on a few sats. So the bigger problem is now is how do I find myself.
In earlier times when you had 2 rigs one would change to cw and in a few beeps would find themselves. Now I have a IC-9100 and I have not found a way to do that so now what..... If I quit the auto I can hear me but go back and try to change the steps still cant hear me.
Any quick ideas one can share
-- Bill Booth VE3NXK Sundridge ON, Canada 79.23.37 W x 45.46.18 N FN05ns
Visit my weather WebCam at http://www.almaguin.com/wxcurrent/weather.html
Organ and Tissue Donation - The Gift of Life Talk to your family. Your decision can make a difference.
Sent via AMSAT-BB(a)amsat.org. 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. Acceptable Use and Privacy Policies available at https://www.amsat.org/about-amsat/
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participants (17)
-
Ashhar Farhan -
Bill Booth -
Burns Fisher -
Daniel R. Marlow -
Eduardo PY2RN -
Jean Marc Momple -
jim＠k6ccc.org -
Joseph B. Fitzgerald -
Mark Johns, K0JM -
Mark L. Hammond -
Nico Janssen -
Nigel A. Gunn G8IFF/W8IFF -
Paul Stoetzer -
Robert Meade -
Samudra Haque [TTLLC] -
Wayne Greene -
Zach Metzinger