January 2023 - pacsat-dev - mailman.amsat.org

Re: AX5043 Booster Board
by Rich Gopstein 19 Jan '23

19 Jan '23

I suspect the matching network is tuned for UHF... On Wed, Jan 18, 2023 at 9:30 PM Burns Fisher (AMSAT) via pacsat-dev < pacsat-dev(a)amsat.org> wrote: > Leaving it will allow a fallback half duplex configuration > > On Thu, Jan 19, 2023 at 3:29 PM Rich Gopstein via pacsat-dev < > pacsat-dev(a)amsat.org> wrote: > >> BTW - the external 90nH inductor isn't needed for the UHF chip. No harm >> in leaving it in, though. >> >> On Wed, Jan 18, 2023 at 4:07 PM Jim McCullers via pacsat-dev < >> pacsat-dev(a)amsat.org> wrote: >> >>> Attached are the schematic and layout for the TMS-570 LaunchPad booster >>> board. >>> >>> >>> >>> It contains two AX5043 circuits configurable for VHF or UHF and places >>> for four MRAMs. >>> >>> Not all positions are required to be present so the build can be by need. >>> >>> It does contain the resistors I discussed that may not be required in >>> future versions. >>> >>> >>> >>> Please give it a review as I’m preparing to send the design to the PCB >>> board maker for a first trial run. >>> >>> >>> >>> 73 >>> >>> >>> >>> Jim McCullers >>> >>> WA4CWI >>> >>> ----------------------------------------------------------- >>> >>> pacsat-dev mailing list -- pacsat-dev(a)amsat.org >>> View archives of this mailing list at >>> https://mailman.amsat.org/hyperkitty/list/[email protected] >>> To unsubscribe send an email to pacsat-dev-leave(a)amsat.org >>> Manage all of your AMSAT-NA mailing list preferences at >>> https://mailman.amsat.org >>> >> >> ----------------------------------------------------------- >> >> pacsat-dev mailing list -- pacsat-dev(a)amsat.org >> View archives of this mailing list at >> https://mailman.amsat.org/hyperkitty/list/[email protected] >> To unsubscribe send an email to pacsat-dev-leave(a)amsat.org >> Manage all of your AMSAT-NA mailing list preferences at >> https://mailman.amsat.org >> > -- > 73, > > Burns Fisher, WB1FJ > *AMSAT(R) Engineering -- Flight Software* > > ----------------------------------------------------------- > > pacsat-dev mailing list -- pacsat-dev(a)amsat.org > View archives of this mailing list at > https://mailman.amsat.org/hyperkitty/list/[email protected] > To unsubscribe send an email to pacsat-dev-leave(a)amsat.org > Manage all of your AMSAT-NA mailing list preferences at > https://mailman.amsat.org >

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Re: AX5043 Booster Board
by Burns Fisher (AMSAT) 19 Jan '23

19 Jan '23

Leaving it will allow a fallback half duplex configuration On Thu, Jan 19, 2023 at 3:29 PM Rich Gopstein via pacsat-dev < pacsat-dev(a)amsat.org> wrote: > BTW - the external 90nH inductor isn't needed for the UHF chip. No harm > in leaving it in, though. > > On Wed, Jan 18, 2023 at 4:07 PM Jim McCullers via pacsat-dev < > pacsat-dev(a)amsat.org> wrote: > >> Attached are the schematic and layout for the TMS-570 LaunchPad booster >> board. >> >> >> >> It contains two AX5043 circuits configurable for VHF or UHF and places >> for four MRAMs. >> >> Not all positions are required to be present so the build can be by need. >> >> It does contain the resistors I discussed that may not be required in >> future versions. >> >> >> >> Please give it a review as I’m preparing to send the design to the PCB >> board maker for a first trial run. >> >> >> >> 73 >> >> >> >> Jim McCullers >> >> WA4CWI >> >> ----------------------------------------------------------- >> >> pacsat-dev mailing list -- pacsat-dev(a)amsat.org >> View archives of this mailing list at >> https://mailman.amsat.org/hyperkitty/list/[email protected] >> To unsubscribe send an email to pacsat-dev-leave(a)amsat.org >> Manage all of your AMSAT-NA mailing list preferences at >> https://mailman.amsat.org >> > > ----------------------------------------------------------- > > pacsat-dev mailing list -- pacsat-dev(a)amsat.org > View archives of this mailing list at > https://mailman.amsat.org/hyperkitty/list/[email protected] > To unsubscribe send an email to pacsat-dev-leave(a)amsat.org > Manage all of your AMSAT-NA mailing list preferences at > https://mailman.amsat.org > -- 73, Burns Fisher, WB1FJ *AMSAT(R) Engineering -- Flight Software*

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AX5043 Booster Board
by Jim McCullers 17 Jan '23

17 Jan '23

Attached are the schematic and layout for the TMS-570 LaunchPad booster board. It contains two AX5043 circuits configurable for VHF or UHF and places for four MRAMs. Not all positions are required to be present so the build can be by need. It does contain the resistors I discussed that may not be required in future versions. Please give it a review as I'm preparing to send the design to the PCB board maker for a first trial run. 73 Jim McCullers WA4CWI

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Re: Pacsat dev meeting 1/12/2023
by Bob Stricklin 13 Jan '23

13 Jan '23

Sorry Bill, Lost track of time and looks like meeting is over. See you next week not a lot to report from me. Bob N5BRG > On Jan 12, 2023, at 1:39 PM, Bill via pacsat-dev <pacsat-dev(a)amsat.org> wrote: > > Pacsat dev meeting 1/12/2023 > Thu, Jan 12, 2023 7:00 PM - 9:00 PM (CST) > > Please join my meeting from your computer, tablet or smartphone. > > https://url.emailprotection.link/?baWZQlhBxtYNcUWAj3ZavKMd7XVTssky7_-fpEVvK… > > 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,,846793741# > > Access Code: 846-793-741 > > > Get the app now and be ready when your first meeting starts: https://url.emailprotection.link/?baWZQlhBxtYNcUWAj3ZavKIXRVUIGqulVnUk2vQrN… > > > > ----------------------------------------------------------- > > pacsat-dev mailing list -- pacsat-dev(a)amsat.org > View archives of this mailing list at https://url.emailprotection.link/?buUg7YY4HZLXKo6ZKNudC8bRTBdOsBlAV5C9rq-aq… > To unsubscribe send an email to pacsat-dev-leave(a)amsat.org > Manage all of your AMSAT-NA mailing list preferences at https://url.emailprotection.link/?bO71JCUf8Kb7txAlIoAarNqcIdQhyb8VQQIN4j0Gi…

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Pacsat dev meeting 1/12/2023
by Bill 12 Jan '23

12 Jan '23

Pacsat dev meeting 1/12/2023 Thu, Jan 12, 2023 7:00 PM - 9:00 PM (CST) Please join my meeting from your computer, tablet or smartphone. https://meet.goto.com/846793741 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,,846793741# Access Code: 846-793-741 Get the app now and be ready when your first meeting starts: https://meet.goto.com/install

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AX5043 Rx and Tx working
by Burns Fisher (AMSAT) 06 Jan '23

06 Jan '23

Thanks to help from Rich, I did get the Launchpad+Jonathan Pi 5043 board to both transmit on 70cm and receive on 2m. Hint: Among other things the 5043 really needs an antenna, not just a dummy load, in order to transmit even a foot or two! 73, Burns Fisher, WB1FJ *AMSAT(R) Engineering -- Flight Software*

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Re: pacsat dev meeting 1-5-2023
by Chris Thompson 06 Jan '23

06 Jan '23

I'm unable to attend today. Sorry about the late notice. I hope to attend next time. 73 Chris On Thu, Jan 5, 2023, 15:21 Bill via pacsat-dev <pacsat-dev(a)amsat.org> wrote: > Welcome to 2023, see you at 7PM > > pacsat dev meeting 2023-1 > Thu, Jan 5, 2023 7:00 PM - 9:00 PM (CST) > > Please join my meeting from your computer, tablet or smartphone. > > https://meet.goto.com/444756509 > > You can also dial in using your phone. > (For supported devices, tap a one-touch number below to join instantly.) > > United States: +1 (408) 650-3123 > - One-touch: tel:+14086503123,,444756509# > > Access Code: 444-756-509 > > > Get the app now and be ready when your first meeting starts: > https://meet.goto.com/install > > > > ----------------------------------------------------------- > > pacsat-dev mailing list -- pacsat-dev(a)amsat.org > View archives of this mailing list at > https://mailman.amsat.org/hyperkitty/list/[email protected] > To unsubscribe send an email to pacsat-dev-leave(a)amsat.org > Manage all of your AMSAT-NA mailing list preferences at > https://mailman.amsat.org >

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pacsat dev meeting 1-5-2023
by Bill 05 Jan '23

05 Jan '23

Welcome to 2023, see you at 7PM pacsat dev meeting 2023-1 Thu, Jan 5, 2023 7:00 PM - 9:00 PM (CST) Please join my meeting from your computer, tablet or smartphone. https://meet.goto.com/444756509 You can also dial in using your phone. (For supported devices, tap a one-touch number below to join instantly.) United States: +1 (408) 650-3123 - One-touch: tel:+14086503123,,444756509# Access Code: 444-756-509 Get the app now and be ready when your first meeting starts: https://meet.goto.com/install

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Satellite use of the AX5043
by Jim McCullers 04 Jan '23

04 Jan '23

Over the holiday break I did some Google searches on the use of the AX5043 in satellite service and found the following references. These two publications cover the OreSat developed at Portland State University. The Ax5043 is employed as UHF transceiver as well as IF for an L-Band receiver. As of yet, I have not received a signal from OreSat0 but as it is a telemetry only satellite the transmitter is possibly only activated for passes over the Oregon area. I've reached out to them via email but have yet to receive a response. https://digitalcommons.usu.edu/cgi/viewcontent.cgi?article=5110&context=smal lsat https://pdxscholar.library.pdx.edu/cgi/viewcontent.cgi?article=6639 <https://pdxscholar.library.pdx.edu/cgi/viewcontent.cgi?article=6639&context =open_access_etds> &context=open_access_etds This paper deals with detection of UHF uplink interference using the AX5042 similar to the AX5043 and makes an interesting case not to use 70cm uplinks due to interference caused by the shared services in the 70cm band. They used a single antenna and LNA into a 4-way splitter similar to what is planned for Pacsat. https://www.sciencedirect.com/science/article/pii/S0273117721007778 The final paper is an interesting study of the AX5043 capabilities. They examined the radiation resistance of the AX5043 and found it held up well. Also is an interesting discussion of LNA requirements as well as radiation resistance of various transistor types. It should be noted the original project was canceled and a follow on is due to launch in 2023. How it might vary in configuration is not published. https://core.ac.uk/download/pdf/295596877.pdf Jim McCullers WA4CWI

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