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

Serial line on pacsat
by Burns Fisher (AMSAT) 27 Apr '23

27 Apr '23

1) The pins to use on the launchpad are j2 pin 3 (RX) and 4 (Tx). Nearby, J3 pin 2 is ground. Note that each row is a different "J" number on the board, and the count 1,2,3 etc from the USB connector end. Jim numbered them on his schematic somewhat more sensibly, but they don't match the board. 2) This is not using the N2HET. It is using a regular SCI UART. 3) There is a lot of code that can be removed to reduce confusion, and someday I'll do that. The N2HET is not used at all. 73, Burns Fisher, WB1FJ *AMSAT(R) Engineering -- Flight Software*

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Re: AX5043
by Rich Gopstein 27 Apr '23

27 Apr '23

Just be aware that the Single-Ended pin is XMIT only. Only the differential pins can do both receive and xmit. Rich On Thu, Apr 27, 2023 at 6:26 PM Burns Fisher (AMSAT) via pacsat-dev < pacsat-dev(a)amsat.org> wrote: > Just FYI (and Zach may have comments) I don't know about differential > first not, but the fact that the 5043 and switch between them means that > the single ended output can be optimized for one band while the > differential can be optimized for another band. That's how one RT-IHU > processor can do either Rx or Tx (but not simultaneously) on two different > bands with the same 5043. > > 73, > > Burns Fisher, WB1FJ > *AMSAT(R) Engineering -- Flight Software* > > > On Thu, Apr 27, 2023 at 10:14 AM Jim McCullers via pacsat-dev < > pacsat-dev(a)amsat.org> wrote: > >> The bandpass filter and LNA would proceed this circuit. >> Most LNAs I'm familiar with are single ended output. >> Differential input is a bit of an oddity for an RF interface. I'm certain >> someone had a reason. >> >> In our instance we will have a bandpass filter followed by an LNA followed >> by a 1:4 splitter for the four receivers. >> Each receiver will require some form of single end to differential >> converter. >> >> 73, >> >> Jim McCullers >> WA4CWI >> >> >> >> On Thu, Apr 27, 2023 at 03:14:21AM +0000, Jim McCullers via pacsat-dev >> wrote: >> > Attached is a document that I prepared to describe work I've done with >> > AX5043 to create a receiver with a reduced component count. >> > >> > I'll post it to github later. >> >> Just curious, I'm not an expert on RF, but where does the LNA fit in here? >> It seems like you could do the conversion from single-ended to >> differential >> using an LNA if you were already using one. >> >> I've only played with single-ended designs, so this is something >> completely >> different for me. >> >> -corey >> >> >> ----------------------------------------------------------- >> >> 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 >

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Re: AX5043
by Burns Fisher (AMSAT) 27 Apr '23

27 Apr '23

Just FYI (and Zach may have comments) I don't know about differential first not, but the fact that the 5043 and switch between them means that the single ended output can be optimized for one band while the differential can be optimized for another band. That's how one RT-IHU processor can do either Rx or Tx (but not simultaneously) on two different bands with the same 5043. 73, Burns Fisher, WB1FJ *AMSAT(R) Engineering -- Flight Software* On Thu, Apr 27, 2023 at 10:14 AM Jim McCullers via pacsat-dev < pacsat-dev(a)amsat.org> wrote: > The bandpass filter and LNA would proceed this circuit. > Most LNAs I'm familiar with are single ended output. > Differential input is a bit of an oddity for an RF interface. I'm certain > someone had a reason. > > In our instance we will have a bandpass filter followed by an LNA followed > by a 1:4 splitter for the four receivers. > Each receiver will require some form of single end to differential > converter. > > 73, > > Jim McCullers > WA4CWI > > > > On Thu, Apr 27, 2023 at 03:14:21AM +0000, Jim McCullers via pacsat-dev > wrote: > > Attached is a document that I prepared to describe work I've done with > > AX5043 to create a receiver with a reduced component count. > > > > I'll post it to github later. > > Just curious, I'm not an expert on RF, but where does the LNA fit in here? > It seems like you could do the conversion from single-ended to differential > using an LNA if you were already using one. > > I've only played with single-ended designs, so this is something completely > different for me. > > -corey > > > ----------------------------------------------------------- > > 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 mtg 4/27/2023
by Bill 27 Apr '23

27 Apr '23

Pacsat dev mtg 4/27/2023 Thu, Apr 27, 2023 7:00 PM - 9:00 PM (CDT) Please join my meeting from your computer, tablet or smartphone. https://meet.goto.com/797343613 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,,797343613# Access Code: 797-343-613 Join from a video-conferencing room or system. Dial in or type: 67.217.95.2 or inroomlink.goto.com Meeting ID: 797 343 613 Or dial directly: 797343613(a)67.217.95.2 or 67.217.95.2##797343613 Get the app now and be ready when your first meeting starts: https://meet.goto.com/install

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Re: AX5043
by Corey Minyard 27 Apr '23

27 Apr '23

On Thu, Apr 27, 2023 at 03:14:21AM +0000, Jim McCullers via pacsat-dev wrote: > Attached is a document that I prepared to describe work I've done with > AX5043 to create a receiver with a reduced component count. > > I'll post it to github later. Just curious, I'm not an expert on RF, but where does the LNA fit in here? It seems like you could do the conversion from single-ended to differential using an LNA if you were already using one. I've only played with single-ended designs, so this is something completely different for me. -corey

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Re: AX5043
by Bob Stricklin 27 Apr '23

27 Apr '23

This looks good Jim. Nice job collecting the data and putting it all together. Bob On Apr 26, 2023, at 10:14 PM, Jim McCullers via pacsat-dev <pacsat-dev(a)amsat.org<mailto:[email protected]>> wrote: Attached is a document that I prepared to describe work I’ve done with AX5043 to create a receiver with a reduced component count. I’ll post it to github later. Jim McCullers WA4CWI <AX5043 Receiver Impedence Matching.pdf> ----------------------------------------------------------- pacsat-dev mailing list -- pacsat-dev(a)amsat.org<mailto:[email protected]> 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<mailto:[email protected]> Manage all of your AMSAT-NA mailing list preferences at https://mailman.amsat.org<https://mailman.amsat.org/>

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Re: AX5043
by Jonathan Brandenburg 26 Apr '23

26 Apr '23

If you're willing, this looks like a fantastic presentation for the AMSAT Symposium! (often around the 3rd weekend of October). I'm going to study if more this evening! Jonathan On 4/26/23 22:14, Jim McCullers via pacsat-dev wrote: > > Attached is a document that I prepared to describe work I’ve done with > AX5043 to create a receiver with a reduced component count. > > I’ll post it to github later. > > Jim McCullers > > WA4CWI > > > ----------------------------------------------------------- > > pacsat-dev mailing list --pacsat-dev(a)amsat.org > View archives of this mailing list athttps://mailman.amsat.org/hyperkitty/list/[email protected] > To unsubscribe send an email topacsat-dev-leave(a)amsat.org > Manage all of your AMSAT-NA mailing list preferences athttps://mailman.amsat.org -- Jonathan Brandenburg Radio Amateur Satellite Corporation 1-214-213-1066

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AX5043
by Jim McCullers 26 Apr '23

26 Apr '23

Attached is a document that I prepared to describe work I've done with AX5043 to create a receiver with a reduced component count. I'll post it to github later. Jim McCullers WA4CWI

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Re: Serial port on Launchpad?
by Burns Fisher (AMSAT) 22 Apr '23

22 Apr '23

Yes Jim’s board has use some on all 4 of those inner groups of pins. New launchpads have headers on 2 of those sets On Sat, Apr 22, 2023 at 8:20 PM Corey Minyard via pacsat-dev < pacsat-dev(a)amsat.org> wrote: > >Do you have one of Jim’s cards? If so the serial line is a 3 pin header. > >If not I don’t remember the pins on the Launchpad. I can dig it up > tomorrow > >if no one has it tonight. It’s 38k4 btw > > I do not have one yet, I think one is coming soon. I'll still need to > install a header on the launchpad to hook it up, right? > > -corey > > >On Sat, Apr 22, 2023 at 7:53 PM Corey Minyard via pacsat-dev < > >pacsat-dev(a)amsat.org> wrote: > > >> I have the current Pacsat software loaded and running, but how do I hook > >> the serial port to the board. The "normal" serial port on the USB > >> interface doesn't seem to work, and IIRC the serial port used by the > >> Pacsat software goes through some other interface. How do you hook it > >> up? > > On Sat, Apr 22, 2023 at 6:52 PM Corey Minyard <minyard(a)acm.org> wrote: > > > > I have the current Pacsat software loaded and running, but how do I hook > > the serial port to the board. The "normal" serial port on the USB > > interface doesn't seem to work, and IIRC the serial port used by the > > Pacsat software goes through some other interface. How do you hook it > > up? > > > > Thanks, > > > > -corey > > ----------------------------------------------------------- > > 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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Serial port on Launchpad?
by Corey Minyard 22 Apr '23

22 Apr '23

I have the current Pacsat software loaded and running, but how do I hook the serial port to the board. The "normal" serial port on the USB interface doesn't seem to work, and IIRC the serial port used by the Pacsat software goes through some other interface. How do you hook it up? Thanks, -corey

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