Bob - in addition to the Chapter 5 Pwr Generation material, this is an extremely good reference document for many CubeSat Development areas. Its open source, publicly published information provides excellent tutorial introductory material for many/most of our AMSAT CubeSat development areas. Consequently, I uploaded a copy to our GOLF SVN under "tech ref docs." I found the first few chapters very familiar given my 40 year System Engineering experience, and a great refresher for my aging brain! But I found the remaining chapters contain excellent tutorial information for the major engineering disciplines we must understand and apply to be successful in our ongoing/future CubeSat development efforts. ALL chapters include myriad hyperlinks to more material electronically published in the open literature. The material does "thin out" in the last few chapters as they appear to be 'works in progress.'
What particularly caught my attention was mention of the University of Hawaii's *Artemis CubeSat Kit *they are offering new satellite developers. I had no luck finding any further information about that kit on their website, but there is an invite to contact the PoC, Dr. F. Zhu (shu@ hawaii.edu) for more information. Specifically mentioned is the availability of a 1U CubeSat structure, fully qualified to NASA and CalPoly requirements, whose mechanical pieces add up to $356.02 (not counting solar panels). That might be worth looking into as Tom Wu is researching commercially available 1U structures for FOX+(PacSat). Furthermore, it is stated that they also have a CAD package for that 1U structure, viz., a 3D model (in Autodesk Inventor) that is available. Perhaps that might be of interest to Tom K. and Marwan. Lastly, I would think Vincent might benefit from one of the references which documents the failures of many past deployable solar panel designs..................good stuff all.
thanks, eric (K1TVV)
On Fri, Oct 28, 2022 at 11:19 AM Bob Stricklin via pacsat [email protected] wrote:
---------- Forwarded message ---------- From: Bob Stricklin [email protected] To: "[email protected]" [email protected] Cc: Bcc: Date: Fri, 28 Oct 2022 15:19:09 +0000 Subject: [pacsat] Power Thoughts Group,
Power requirments is something we need to be looking at carefully.
I found this on the web:
https://pressbooks-dev.oer.hawaii.edu/epet302/chapter/5-5-power-generation/
We can look at some data from other cubsats for power generation. Reviewing Falconsat-3 telemetry would be a good idea.
Power and thermal design will play off each other.
With a 2.5 W power budget for a cubsat the pacsat payload could be a large power consumer. May effect ability to get onboard.
If Golf T had two of the TMS520 one must have been powered down until needed?
Designing for minimum power will yield more operating time and a longer mission life. Falconsat-3 is demonstrating this point now.
Bob N5BRG
---------- Forwarded message ---------- From: Bob Stricklin via pacsat [email protected] To: "[email protected]" [email protected] Cc: Bcc: Date: Fri, 28 Oct 2022 15:19:09 +0000 Subject: [pacsat] Power Thoughts
pacsat mailing list -- [email protected] View archives of this mailing list at https://mailman.amsat.org/hyperkitty/list/[email protected] To unsubscribe send an email to [email protected] Manage all of your AMSAT-NA mailing list preferences at https://mailman.amsat.org
Good comments Eric.
I was really looking for info on the power available myself. I know how to work through it but thought I would just do a google search and this popped up. I have not followed the Golf developments closely so Burns comment about size and deploying cells was enlightening to me.
I feel the best source of power info is probably telemetry from previous satellites all things in the solar design and orbit being roughly equal. There would be an opportunity to increase power by using III V based solar cells but this would be a cost increase and more difficult. I think we are the tail here and not the dog so we have to work with what comes to us on the two wires.
Hopefully your careful reading of the link will help others and become a side benefit of this team working and generating information. There may also be a need for someone to go to Hawaii and talk to these guys.:)
Bob N5BRG
On Oct 28, 2022, at 8:14 PM, Eric Skoog <[email protected]mailto:[email protected]> wrote:
Bob - in addition to the Chapter 5 Pwr Generation material, this is an extremely good reference document for many CubeSat Development areas. Its open source, publicly published information provides excellent tutorial introductory material for many/most of our AMSAT CubeSat development areas. Consequently, I uploaded a copy to our GOLF SVN under "tech ref docs." I found the first few chapters very familiar given my 40 year System Engineering experience, and a great refresher for my aging brain! But I found the remaining chapters contain excellent tutorial information for the major engineering disciplines we must understand and apply to be successful in our ongoing/future CubeSat development efforts. ALL chapters include myriad hyperlinks to more material electronically published in the open literature. The material does "thin out" in the last few chapters as they appear to be 'works in progress.'
What particularly caught my attention was mention of the University of Hawaii's Artemis CubeSat Kit they are offering new satellite developers. I had no luck finding any further information about that kit on their website, but there is an invite to contact the PoC, Dr. F. Zhu (shu@ hawaii.eduhttps://url.emailprotection.link/?bBquJvoTh-e8v7jI6vELwNFIFA7qn7BJSmBgWPudUloMaQdZQnBqtXZSnwbeXbhbXFNYc1TBJK94CdCoO7Embag~~) for more information. Specifically mentioned is the availability of a 1U CubeSat structure, fully qualified to NASA and CalPoly requirements, whose mechanical pieces add up to $356.02 (not counting solar panels). That might be worth looking into as Tom Wu is researching commercially available 1U structures for FOX+(PacSat). Furthermore, it is stated that they also have a CAD package for that 1U structure, viz., a 3D model (in Autodesk Inventor) that is available. Perhaps that might be of interest to Tom K. and Marwan. Lastly, I would think Vincent might benefit from one of the references which documents the failures of many past deployable solar panel designs..................good stuff all.
thanks, eric (K1TVV)
On Fri, Oct 28, 2022 at 11:19 AM Bob Stricklin via pacsat <[email protected]mailto:[email protected]> wrote:
---------- Forwarded message ---------- From: Bob Stricklin <[email protected]mailto:[email protected]> To: "[email protected]mailto:[email protected]" <[email protected]mailto:[email protected]> Cc: Bcc: Date: Fri, 28 Oct 2022 15:19:09 +0000 Subject: [pacsat] Power Thoughts Group,
Power requirments is something we need to be looking at carefully.
I found this on the web:
https://pressbooks-dev.oer.hawaii.edu/epet302/chapter/5-5-power-generation/https://url.emailprotection.link/?b7aSZ4T1AMPaggBd5ao8URU4lFKDNN3pwjXBWW9KM30w5OHwhoYTmak88W7fu2g1S4DL4TwkGouvOTF4A81hjgEyw-HsDcV2E-vgFXsDQlcz_B02dIY4__yKk5MGwlxZk
We can look at some data from other cubsats for power generation. Reviewing Falconsat-3 telemetry would be a good idea.
Power and thermal design will play off each other.
With a 2.5 W power budget for a cubsat the pacsat payload could be a large power consumer. May effect ability to get onboard.
If Golf T had two of the TMS520 one must have been powered down until needed?
Designing for minimum power will yield more operating time and a longer mission life. Falconsat-3 is demonstrating this point now.
Bob N5BRG
---------- Forwarded message ---------- From: Bob Stricklin via pacsat <[email protected]mailto:[email protected]> To: "[email protected]mailto:[email protected]" <[email protected]mailto:[email protected]> Cc: Bcc: Date: Fri, 28 Oct 2022 15:19:09 +0000 Subject: [pacsat] Power Thoughts ----------------------------------------------- pacsat mailing list -- [email protected]mailto:[email protected] View archives of this mailing list at https://mailman.amsat.org/hyperkitty/list/[email protected]https://url.emailprotection.link/?b5qYATJ4AvjJ05toBkiiLaMPlv1Y3QPE5U0sxMp-jMc3ECRZriWX_0f2xf9Eh9bJTVVC-691in_3uk1tjBYI3aAofBZgvlREmYoFYgIb7FgJx-YaXSXKZqf_n1wCWb0Uf To unsubscribe send an email to [email protected]mailto:[email protected] Manage all of your AMSAT-NA mailing list preferences at https://mailman.amsat.orghttps://url.emailprotection.link/?bO71JCUf8Kb7txAlIoAarNqcIdQhyb8VQQIN4j0Gik24jnwI-Byk6ZVn92BYiD7Bxz61XZBoNoJE1TKqdfKnwFw~~
Good idea, and since AMSAT's finances were reported at the Space Symposium to be in such great shape....................perhaps that's possible. Or alternatively, GOLF eng team member Leandra's parents live there and she visits them regularly...............not to mention that FOX+ volunteer, Matthew Leonard LIVES there!! 😱
eric
On Fri, Oct 28, 2022 at 10:05 PM Bob Stricklin [email protected] wrote:
Good comments Eric.
I was really looking for info on the power available myself. I know how to work through it but thought I would just do a google search and this popped up. I have not followed the Golf developments closely so Burns comment about size and deploying cells was enlightening to me.
I feel the best source of power info is probably telemetry from previous satellites all things in the solar design and orbit being roughly equal. There would be an opportunity to increase power by using III V based solar cells but this would be a cost increase and more difficult. I think we are the tail here and not the dog so we have to work with what comes to us on the two wires.
Hopefully your careful reading of the link will help others and become a side benefit of this team working and generating information. There may also be a need for someone to go to Hawaii and talk to these guys.:)
Bob N5BRG
On Oct 28, 2022, at 8:14 PM, Eric Skoog [email protected] wrote:
Bob - in addition to the Chapter 5 Pwr Generation material, this is an extremely good reference document for many CubeSat Development areas. Its open source, publicly published information provides excellent tutorial introductory material for many/most of our AMSAT CubeSat development areas. Consequently, I uploaded a copy to our GOLF SVN under "tech ref docs." I found the first few chapters very familiar given my 40 year System Engineering experience, and a great refresher for my aging brain! But I found the remaining chapters contain excellent tutorial information for the major engineering disciplines we must understand and apply to be successful in our ongoing/future CubeSat development efforts. ALL chapters include myriad hyperlinks to more material electronically published in the open literature. The material does "thin out" in the last few chapters as they appear to be 'works in progress.'
What particularly caught my attention was mention of the University of Hawaii's *Artemis CubeSat Kit *they are offering new satellite developers. I had no luck finding any further information about that kit on their website, but there is an invite to contact the PoC, Dr. F. Zhu (shu@ hawaii.edu https://url.emailprotection.link/?bBquJvoTh-e8v7jI6vELwNFIFA7qn7BJSmBgWPudUloMaQdZQnBqtXZSnwbeXbhbXFNYc1TBJK94CdCoO7Embag~~) for more information. Specifically mentioned is the availability of a 1U CubeSat structure, fully qualified to NASA and CalPoly requirements, whose mechanical pieces add up to $356.02 (not counting solar panels). That might be worth looking into as Tom Wu is researching commercially available 1U structures for FOX+(PacSat). Furthermore, it is stated that they also have a CAD package for that 1U structure, viz., a 3D model (in Autodesk Inventor) that is available. Perhaps that might be of interest to Tom K. and Marwan. Lastly, I would think Vincent might benefit from one of the references which documents the failures of many past deployable solar panel designs..................good stuff all.
thanks, eric (K1TVV)
On Fri, Oct 28, 2022 at 11:19 AM Bob Stricklin via pacsat < [email protected]> wrote:
---------- Forwarded message ---------- From: Bob Stricklin [email protected] To: "[email protected]" [email protected] Cc: Bcc: Date: Fri, 28 Oct 2022 15:19:09 +0000 Subject: [pacsat] Power Thoughts Group,
Power requirments is something we need to be looking at carefully.
I found this on the web:
https://pressbooks-dev.oer.hawaii.edu/epet302/chapter/5-5-power-generation/ https://url.emailprotection.link/?b7aSZ4T1AMPaggBd5ao8URU4lFKDNN3pwjXBWW9KM30w5OHwhoYTmak88W7fu2g1S4DL4TwkGouvOTF4A81hjgEyw-HsDcV2E-vgFXsDQlcz_B02dIY4__yKk5MGwlxZk
We can look at some data from other cubsats for power generation. Reviewing Falconsat-3 telemetry would be a good idea.
Power and thermal design will play off each other.
With a 2.5 W power budget for a cubsat the pacsat payload could be a large power consumer. May effect ability to get onboard.
If Golf T had two of the TMS520 one must have been powered down until needed?
Designing for minimum power will yield more operating time and a longer mission life. Falconsat-3 is demonstrating this point now.
Bob N5BRG
---------- Forwarded message ---------- From: Bob Stricklin via pacsat [email protected] To: "[email protected]" [email protected] Cc: Bcc: Date: Fri, 28 Oct 2022 15:19:09 +0000 Subject: [pacsat] Power Thoughts
pacsat mailing list -- [email protected] View archives of this mailing list at https://mailman.amsat.org/hyperkitty/list/[email protected] https://url.emailprotection.link/?b5qYATJ4AvjJ05toBkiiLaMPlv1Y3QPE5U0sxMp-jMc3ECRZriWX_0f2xf9Eh9bJTVVC-691in_3uk1tjBYI3aAofBZgvlREmYoFYgIb7FgJx-YaXSXKZqf_n1wCWb0Uf To unsubscribe send an email to [email protected] Manage all of your AMSAT-NA mailing list preferences at https://mailman.amsat.org https://url.emailprotection.link/?bO71JCUf8Kb7txAlIoAarNqcIdQhyb8VQQIN4j0Gik24jnwI-Byk6ZVn92BYiD7Bxz61XZBoNoJE1TKqdfKnwFw~~
Here is the data from a 1U cubesat (Fox-1e) so you can see the approximate current and voltage (the Voltage is Bat1+Bat2+Bat3 which is the same bus that the panels feed through the MPPT. We just found out that these solar cells are no longer available; the newer ones are more efficient (was it 8%?) so the numbers will be a bit better.
73,
Burns Fisher, WB1FJ *AMSAT(R) Engineering -- Flight Software*
On Fri, Oct 28, 2022 at 11:22 PM Eric Skoog [email protected] wrote:
Good idea, and since AMSAT's finances were reported at the Space Symposium to be in such great shape....................perhaps that's possible. Or alternatively, GOLF eng team member Leandra's parents live there and she visits them regularly...............not to mention that FOX+ volunteer, Matthew Leonard LIVES there!! 😱
eric
On Fri, Oct 28, 2022 at 10:05 PM Bob Stricklin [email protected] wrote:
Good comments Eric.
I was really looking for info on the power available myself. I know how to work through it but thought I would just do a google search and this popped up. I have not followed the Golf developments closely so Burns comment about size and deploying cells was enlightening to me.
I feel the best source of power info is probably telemetry from previous satellites all things in the solar design and orbit being roughly equal. There would be an opportunity to increase power by using III V based solar cells but this would be a cost increase and more difficult. I think we are the tail here and not the dog so we have to work with what comes to us on the two wires.
Hopefully your careful reading of the link will help others and become a side benefit of this team working and generating information. There may also be a need for someone to go to Hawaii and talk to these guys.:)
Bob N5BRG
On Oct 28, 2022, at 8:14 PM, Eric Skoog [email protected] wrote:
Bob - in addition to the Chapter 5 Pwr Generation material, this is an extremely good reference document for many CubeSat Development areas. Its open source, publicly published information provides excellent tutorial introductory material for many/most of our AMSAT CubeSat development areas. Consequently, I uploaded a copy to our GOLF SVN under "tech ref docs." I found the first few chapters very familiar given my 40 year System Engineering experience, and a great refresher for my aging brain! But I found the remaining chapters contain excellent tutorial information for the major engineering disciplines we must understand and apply to be successful in our ongoing/future CubeSat development efforts. ALL chapters include myriad hyperlinks to more material electronically published in the open literature. The material does "thin out" in the last few chapters as they appear to be 'works in progress.'
What particularly caught my attention was mention of the University of Hawaii's *Artemis CubeSat Kit *they are offering new satellite developers. I had no luck finding any further information about that kit on their website, but there is an invite to contact the PoC, Dr. F. Zhu (shu@ hawaii.edu https://url.emailprotection.link/?bBquJvoTh-e8v7jI6vELwNFIFA7qn7BJSmBgWPudUloMaQdZQnBqtXZSnwbeXbhbXFNYc1TBJK94CdCoO7Embag~~) for more information. Specifically mentioned is the availability of a 1U CubeSat structure, fully qualified to NASA and CalPoly requirements, whose mechanical pieces add up to $356.02 (not counting solar panels). That might be worth looking into as Tom Wu is researching commercially available 1U structures for FOX+(PacSat). Furthermore, it is stated that they also have a CAD package for that 1U structure, viz., a 3D model (in Autodesk Inventor) that is available. Perhaps that might be of interest to Tom K. and Marwan. Lastly, I would think Vincent might benefit from one of the references which documents the failures of many past deployable solar panel designs..................good stuff all.
thanks, eric (K1TVV)
On Fri, Oct 28, 2022 at 11:19 AM Bob Stricklin via pacsat < [email protected]> wrote:
---------- Forwarded message ---------- From: Bob Stricklin [email protected] To: "[email protected]" [email protected] Cc: Bcc: Date: Fri, 28 Oct 2022 15:19:09 +0000 Subject: [pacsat] Power Thoughts Group,
Power requirments is something we need to be looking at carefully.
I found this on the web:
https://pressbooks-dev.oer.hawaii.edu/epet302/chapter/5-5-power-generation/ https://url.emailprotection.link/?b7aSZ4T1AMPaggBd5ao8URU4lFKDNN3pwjXBWW9KM30w5OHwhoYTmak88W7fu2g1S4DL4TwkGouvOTF4A81hjgEyw-HsDcV2E-vgFXsDQlcz_B02dIY4__yKk5MGwlxZk
We can look at some data from other cubsats for power generation. Reviewing Falconsat-3 telemetry would be a good idea.
Power and thermal design will play off each other.
With a 2.5 W power budget for a cubsat the pacsat payload could be a large power consumer. May effect ability to get onboard.
If Golf T had two of the TMS520 one must have been powered down until needed?
Designing for minimum power will yield more operating time and a longer mission life. Falconsat-3 is demonstrating this point now.
Bob N5BRG
---------- Forwarded message ---------- From: Bob Stricklin via pacsat [email protected] To: "[email protected]" [email protected] Cc: Bcc: Date: Fri, 28 Oct 2022 15:19:09 +0000 Subject: [pacsat] Power Thoughts
pacsat mailing list -- [email protected] View archives of this mailing list at https://mailman.amsat.org/hyperkitty/list/[email protected] https://url.emailprotection.link/?b5qYATJ4AvjJ05toBkiiLaMPlv1Y3QPE5U0sxMp-jMc3ECRZriWX_0f2xf9Eh9bJTVVC-691in_3uk1tjBYI3aAofBZgvlREmYoFYgIb7FgJx-YaXSXKZqf_n1wCWb0Uf To unsubscribe send an email to [email protected] Manage all of your AMSAT-NA mailing list preferences at https://mailman.amsat.org https://url.emailprotection.link/?bO71JCUf8Kb7txAlIoAarNqcIdQhyb8VQQIN4j0Gik24jnwI-Byk6ZVn92BYiD7Bxz61XZBoNoJE1TKqdfKnwFw~~
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Bob,
In addition to Burns' message, we can provide telemetry from all the recent satellites, or tell you how to access it. I agree the best example for a 1U Cubesat is AO-109 / Fox-1E because it has Whole Orbit Data and that is easier to follow. But we don't have much data for it because it needs a radio telescope to collect. We have a lot of data for the other 1U spacecraft. We can also provide telemetry for FalconSat-3, at least since we took it over. But it is not a Cubesat and has much larger batteries, solar panels etc.
There was also data on the amsat.org server for ao-16 and ao-51 (both PACSATs but both larger and with more radios) but the links are no longer available. I could track down that data perhaps. It was on the amsat ftp server, which IT decommissioned as I remember.
Let me know what will help.
73 Chris
On Fri, Oct 28, 2022 at 11:22 PM Eric Skoog [email protected] wrote:
Good idea, and since AMSAT's finances were reported at the Space Symposium to be in such great shape....................perhaps that's possible. Or alternatively, GOLF eng team member Leandra's parents live there and she visits them regularly...............not to mention that FOX+ volunteer, Matthew Leonard LIVES there!! 😱
eric
On Fri, Oct 28, 2022 at 10:05 PM Bob Stricklin [email protected] wrote:
Good comments Eric.
I was really looking for info on the power available myself. I know how to work through it but thought I would just do a google search and this popped up. I have not followed the Golf developments closely so Burns comment about size and deploying cells was enlightening to me.
I feel the best source of power info is probably telemetry from previous satellites all things in the solar design and orbit being roughly equal. There would be an opportunity to increase power by using III V based solar cells but this would be a cost increase and more difficult. I think we are the tail here and not the dog so we have to work with what comes to us on the two wires.
Hopefully your careful reading of the link will help others and become a side benefit of this team working and generating information. There may also be a need for someone to go to Hawaii and talk to these guys.:)
Bob N5BRG
On Oct 28, 2022, at 8:14 PM, Eric Skoog [email protected] wrote:
Bob - in addition to the Chapter 5 Pwr Generation material, this is an extremely good reference document for many CubeSat Development areas. Its open source, publicly published information provides excellent tutorial introductory material for many/most of our AMSAT CubeSat development areas. Consequently, I uploaded a copy to our GOLF SVN under "tech ref docs." I found the first few chapters very familiar given my 40 year System Engineering experience, and a great refresher for my aging brain! But I found the remaining chapters contain excellent tutorial information for the major engineering disciplines we must understand and apply to be successful in our ongoing/future CubeSat development efforts. ALL chapters include myriad hyperlinks to more material electronically published in the open literature. The material does "thin out" in the last few chapters as they appear to be 'works in progress.'
What particularly caught my attention was mention of the University of Hawaii's *Artemis CubeSat Kit *they are offering new satellite developers. I had no luck finding any further information about that kit on their website, but there is an invite to contact the PoC, Dr. F. Zhu (shu@ hawaii.edu https://url.emailprotection.link/?bBquJvoTh-e8v7jI6vELwNFIFA7qn7BJSmBgWPudUloMaQdZQnBqtXZSnwbeXbhbXFNYc1TBJK94CdCoO7Embag~~) for more information. Specifically mentioned is the availability of a 1U CubeSat structure, fully qualified to NASA and CalPoly requirements, whose mechanical pieces add up to $356.02 (not counting solar panels). That might be worth looking into as Tom Wu is researching commercially available 1U structures for FOX+(PacSat). Furthermore, it is stated that they also have a CAD package for that 1U structure, viz., a 3D model (in Autodesk Inventor) that is available. Perhaps that might be of interest to Tom K. and Marwan. Lastly, I would think Vincent might benefit from one of the references which documents the failures of many past deployable solar panel designs..................good stuff all.
thanks, eric (K1TVV)
On Fri, Oct 28, 2022 at 11:19 AM Bob Stricklin via pacsat < [email protected]> wrote:
---------- Forwarded message ---------- From: Bob Stricklin [email protected] To: "[email protected]" [email protected] Cc: Bcc: Date: Fri, 28 Oct 2022 15:19:09 +0000 Subject: [pacsat] Power Thoughts Group,
Power requirments is something we need to be looking at carefully.
I found this on the web:
https://pressbooks-dev.oer.hawaii.edu/epet302/chapter/5-5-power-generation/ https://url.emailprotection.link/?b7aSZ4T1AMPaggBd5ao8URU4lFKDNN3pwjXBWW9KM30w5OHwhoYTmak88W7fu2g1S4DL4TwkGouvOTF4A81hjgEyw-HsDcV2E-vgFXsDQlcz_B02dIY4__yKk5MGwlxZk
We can look at some data from other cubsats for power generation. Reviewing Falconsat-3 telemetry would be a good idea.
Power and thermal design will play off each other.
With a 2.5 W power budget for a cubsat the pacsat payload could be a large power consumer. May effect ability to get onboard.
If Golf T had two of the TMS520 one must have been powered down until needed?
Designing for minimum power will yield more operating time and a longer mission life. Falconsat-3 is demonstrating this point now.
Bob N5BRG
---------- Forwarded message ---------- From: Bob Stricklin via pacsat [email protected] To: "[email protected]" [email protected] Cc: Bcc: Date: Fri, 28 Oct 2022 15:19:09 +0000 Subject: [pacsat] Power Thoughts
pacsat mailing list -- [email protected] View archives of this mailing list at https://mailman.amsat.org/hyperkitty/list/[email protected] https://url.emailprotection.link/?b5qYATJ4AvjJ05toBkiiLaMPlv1Y3QPE5U0sxMp-jMc3ECRZriWX_0f2xf9Eh9bJTVVC-691in_3uk1tjBYI3aAofBZgvlREmYoFYgIb7FgJx-YaXSXKZqf_n1wCWb0Uf To unsubscribe send an email to [email protected] Manage all of your AMSAT-NA mailing list preferences at https://mailman.amsat.org https://url.emailprotection.link/?bO71JCUf8Kb7txAlIoAarNqcIdQhyb8VQQIN4j0Gik24jnwI-Byk6ZVn92BYiD7Bxz61XZBoNoJE1TKqdfKnwFw~~
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participants (4)
-
Bob Stricklin -
Burns Fisher (AMSAT) -
Chris Thompson -
Eric Skoog