October 2022 - pacsat - mailman.amsat.org

Re: Introduction and Falconsat-3 question
by Mark L. Hammond 30 Oct '22

30 Oct '22

Hi Bob, it's been a while since we worked together on the AMSAT/TAPR DSP-93 :) My call was KC4EBR back then. Still one of my favorite projects :) Glad to be working on a common project again! I will plan to try to run Falconsat-3 for about 24 hours each weekend, with specifics dependent upon the time of day it's overhead, work, and recreation! The orbit precesses about 30 mins every day, so the time of day for usable passes cycles. But basically a 24 hour uptime every weekend. There's a pass around 1222UTC today 29 Oct 202, and I'll turn it ON with battery management OFF, hoping for about 24 hours of operations. I'll continue this as long as I reasonably can. Reentry is estimated to be in April 2022. Telemetry suggests that one cell is very weak, continuous 24/7/365 operations are no longer possible. My best advice is to follow me on Twitter! It's easy to post when I turn it ON/OFF, so lately that's been my preferred method of sharing the information. Also, please update your keps at least once per week, maybe more often. It appears to change enough to warrant this for people using tracking/high gain directional antennas. Here is the TLE source I'm using now: http://www.amsat.org/amsat/ftp/keps/current/daily.all Hope this schedule works for the team! We have a number of users around the planet that use it, and they are happy as well to hear that operations will be scheduled. I'll copy most of this email to the AMSAT-BB soon as well. If there are other requests for a specific day, just ask! If I can support, I will... 73! Mark L. Hammond [N8MH] AMSAT Director and Command Station On Thu, Oct 27, 2022 at 8:33 PM Bob Stricklin via pacsat <pacsat(a)amsat.org> wrote: > > > > ---------- Forwarded message ---------- > From: Bob Stricklin <bstrick(a)n5brg.com> > To: "Mark L. Hammond" <marklhammond(a)gmail.com> > Cc: "pacsat(a)amsat.org" <pacsat(a)amsat.org> > Bcc: > Date: Fri, 28 Oct 2022 00:33:26 +0000 > Subject: [pacsat] Re: Introduction and Falconsat-3 question > Mark, > > Thanks for your offer to turn on Falconsat one day a week. > > If you do this I will try to copy the passes I can see and will also work > to upload a few messages. > > If you find doing this for a full day every week is too taxing for you or > for Falconsat-3 a lesser amount of on time would be fine also. Hopefully we > could learn something from the effort and > get some more action out of the satellite before it derbies. > > Thanks, > > Bob N5BRG > > > > > On Oct 25, 2022, at 10:45 AM, Mark L. Hammond <marklhammond(a)gmail.com> > wrote: > > > > Hello PACSAT Team---it was great to learn about this project from > Jonathan at the recent AMSAT Symposium. I'm delighted to hear that you're > working on a PACSAT version of something new... > > > > It was the original microsats/pacsats project and launch that got me > interested in satellite communications, so I've been doing it for a while. > Happy to give opinions or suggestions when needed--don't be afraid to ask. > > > > My question--is there one day each week where you'd like me to turn ON > > Falconsat-3 for about 24 hours of operations? I think it'll take this > 'abuse' for a while; it's predicted to reenter around April next year, so > we have a few months before it's gone.... > > > > Putting the satellite on an operation schedule will help people know > when to expect it to be on. I though you all might enjoy listening/working > it, making recordings, tests, whatever, while we still have it working. A > challenge is that the orbit precesses like 30 mins per day, so eventually > it shifts where all passes are during the sleeping hours...so there will > some weeks where it might not be turned on... > > > > So, can you all pick the day when you'd like it on? I'll do my best to > keep it going per schedule...Drew KO4MA is also on the list, and he'll help > as needed I'm sure. > > > > Both of us are interested in an outline/overview of what you all > imagine. I think I learned 1200 AFSK uplink (four frequencies/channels), > 9600 baud FSK downlink. My preferred is 2M uplink, 70cm downlink (since > it's so quiet). It'll take about 500mw to 1W on the downlink to be useable > at 9600. Even more is desirable or necessary if you want to go higher than > 9600... I think I'm one of the remaining dinosaurs that has experience and > equipment to do 38k4 on the downlink...although wideband SDRs has changed > that! > > > > 73! > > > > Mark L. Hammond [N8MH] (formerly KC4EBR) > > AMSAT Director and Command Station > > > > ----------------------------------------------- > > pacsat mailing list -- pacsat(a)amsat.org > > View archives of this mailing list at > https://mailman.amsat.org/hyperkitty/list/pacsat@amsat.org > > To unsubscribe send an email to pacsat-leave(a)amsat.org > > Manage all of your AMSAT-NA mailing list preferences at > https://mailman.amsat.org > > > > ---------- Forwarded message ---------- > From: Bob Stricklin via pacsat <pacsat(a)amsat.org> > To: "Mark L. Hammond" <marklhammond(a)gmail.com> > Cc: "pacsat(a)amsat.org" <pacsat(a)amsat.org> > Bcc: > Date: Fri, 28 Oct 2022 00:33:26 +0000 > Subject: [pacsat] Re: Introduction and Falconsat-3 question > ----------------------------------------------- > pacsat mailing list -- pacsat(a)amsat.org > View archives of this mailing list at > https://mailman.amsat.org/hyperkitty/list/pacsat@amsat.org > To unsubscribe send an email to pacsat-leave(a)amsat.org > Manage all of your AMSAT-NA mailing list preferences at > https://mailman.amsat.org >

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Github site
by Chris Thompson 30 Oct '22

30 Oct '22

Does someone have details of the github site? I have drafted a document on the "Basic BBS Operations" and want to share it. If the site is not ready then I can send it to this list. 73 Chris G0KLA / AC2CZ -- Chris E. Thompson chrisethompson(a)gmail.com g0kla(a)arrl.net

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Re: Introduction and Falconsat-3 question
by Burns Fisher (AMSAT) 30 Oct '22

30 Oct '22

That's pretty interesting that you feel we need 1 Watt or so for 9600 baud downlink, Mark. I'm not sure if anyone thought about that. We have also been talking about multiple speed uplinks. I.e. one receiver at 1200, 1 at 9600, or whatever. Personally I want a 1200 baud uplink for my *&)E^T# IC9700, which is otherwise a great radio :-) 73, Burns Fisher, WB1FJ *AMSAT(R) Engineering -- Flight Software* On Tue, Oct 25, 2022 at 12:04 PM Jonathan Brandenburg via pacsat < pacsat(a)amsat.org> wrote: > > > > ---------- Forwarded message ---------- > From: Jonathan Brandenburg <jbrandenburg(a)amsat.org> > To: pacsat(a)amsat.org > Cc: > Bcc: > Date: Tue, 25 Oct 2022 11:04:28 -0500 > Subject: [pacsat] Re: Introduction and Falconsat-3 question > On 10/25/2022 10:45 AM, Mark L. Hammond wrote: > > My question--is there one day each week where you'd like me to turn ON > > Falconsat-3 for about 24 hours of operations? > > Thank you for the offer, Mark! > > This might be the kick in the pants I need to finally assemble my > satellite packet station. I'll get to work on that right away. In the > meantime, I hope others on this list are more prepared than I am. > > Jonathan > > -- > Jonathan, KF5IDY > > > > > ---------- Forwarded message ---------- > From: Jonathan Brandenburg via pacsat <pacsat(a)amsat.org> > To: pacsat(a)amsat.org > Cc: > Bcc: > Date: Tue, 25 Oct 2022 11:04:28 -0500 > Subject: [pacsat] Re: Introduction and Falconsat-3 question > ----------------------------------------------- > pacsat mailing list -- pacsat(a)amsat.org > View archives of this mailing list at > https://mailman.amsat.org/hyperkitty/list/pacsat@amsat.org > To unsubscribe send an email to pacsat-leave(a)amsat.org > Manage all of your AMSAT-NA mailing list preferences at > https://mailman.amsat.org >

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Re: Power Thoughts
by Eric Skoog 29 Oct '22

29 Oct '22

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 <pacsat(a)amsat.org> wrote: > > > > ---------- Forwarded message ---------- > From: Bob Stricklin <bstrick(a)n5brg.com> > To: "pacsat(a)amsat.org" <pacsat(a)amsat.org> > 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 <pacsat(a)amsat.org> > To: "pacsat(a)amsat.org" <pacsat(a)amsat.org> > Cc: > Bcc: > Date: Fri, 28 Oct 2022 15:19:09 +0000 > Subject: [pacsat] Power Thoughts > ----------------------------------------------- > pacsat mailing list -- pacsat(a)amsat.org > View archives of this mailing list at > https://mailman.amsat.org/hyperkitty/list/pacsat@amsat.org > To unsubscribe send an email to pacsat-leave(a)amsat.org > Manage all of your AMSAT-NA mailing list preferences at > https://mailman.amsat.org >

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Re: Power Thoughts
by Burns Fisher (AMSAT) 28 Oct '22

28 Oct '22

Golf-Tee does not power down the standby processor. It is still handling its own telemetry and also keeping its on MRAM up to date with whole orbit data, not to mention running the command receiver. But remember Golt-TEE is a 3U with fold-out panels. 73, Burns Fisher, WB1FJ *AMSAT(R) Engineering -- Flight Software* On Fri, Oct 28, 2022 at 11:19 AM Bob Stricklin via pacsat <pacsat(a)amsat.org> wrote: > > > > ---------- Forwarded message ---------- > From: Bob Stricklin <bstrick(a)n5brg.com> > To: "pacsat(a)amsat.org" <pacsat(a)amsat.org> > 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 <pacsat(a)amsat.org> > To: "pacsat(a)amsat.org" <pacsat(a)amsat.org> > Cc: > Bcc: > Date: Fri, 28 Oct 2022 15:19:09 +0000 > Subject: [pacsat] Power Thoughts > ----------------------------------------------- > pacsat mailing list -- pacsat(a)amsat.org > View archives of this mailing list at > https://mailman.amsat.org/hyperkitty/list/pacsat@amsat.org > To unsubscribe send an email to pacsat-leave(a)amsat.org > Manage all of your AMSAT-NA mailing list preferences at > https://mailman.amsat.org >

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the list
by Bill 28 Oct '22

28 Oct '22

list attached

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Power Thoughts
by Bob Stricklin 28 Oct '22

28 Oct '22

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

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Introduction and Falconsat-3 question
by Mark L. Hammond 28 Oct '22

28 Oct '22

Hello PACSAT Team---it was great to learn about this project from Jonathan at the recent AMSAT Symposium. I'm delighted to hear that you're working on a PACSAT version of something new... It was the original microsats/pacsats project and launch that got me interested in satellite communications, so I've been doing it for a while. Happy to give opinions or suggestions when needed--don't be afraid to ask. My question--is there one day each week where you'd like me to turn ON Falconsat-3 for about 24 hours of operations? I think it'll take this 'abuse' for a while; it's predicted to reenter around April next year, so we have a few months before it's gone.... Putting the satellite on an operation schedule will help people know when to expect it to be on. I though you all might enjoy listening/working it, making recordings, tests, whatever, while we still have it working. A challenge is that the orbit precesses like 30 mins per day, so eventually it shifts where all passes are during the sleeping hours...so there will some weeks where it might not be turned on... So, can you all pick the day when you'd like it on? I'll do my best to keep it going per schedule...Drew KO4MA is also on the list, and he'll help as needed I'm sure. Both of us are interested in an outline/overview of what you all imagine. I think I learned 1200 AFSK uplink (four frequencies/channels), 9600 baud FSK downlink. My preferred is 2M uplink, 70cm downlink (since it's so quiet). It'll take about 500mw to 1W on the downlink to be useable at 9600. Even more is desirable or necessary if you want to go higher than 9600... I think I'm one of the remaining dinosaurs that has experience and equipment to do 38k4 on the downlink...although wideband SDRs has changed that! 73! Mark L. Hammond [N8MH] (formerly KC4EBR) AMSAT Director and Command Station

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Pacsat ConOPS document
by Bill 27 Oct '22

27 Oct '22

Attached is version 1.0 of the AMSAT PACSAT Payload conops document. We will discuss this briefly at tomorrows dev meeting. Bill

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Pacsat Dev Meeting
by Bill 26 Oct '22

26 Oct '22

Pacsat Dev Meeting #2 Thu, Oct 27, 2022 8:00 PM - 10:00 PM (CDT) Please join my meeting from your computer, tablet or smartphone. https://meet.goto.com/909715813 You can also dial in using your phone. (For supported devices, tap a one-touch number below to join instantly.) United States: +1 (872) 240-3212 - One-touch: tel:+18722403212,,909715813# Access Code: 909-715-813 Get the app now and be ready when your first meeting starts: https://meet.goto.com/install Agenda: * Conops discussion * Engineering process * Task List

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