November 2022 - pacsat-dev - mailman.amsat.org

Power fail-safe embedded file system for FreeRTOS
by Rich Gopstein 12 Dec '22

12 Dec '22

I found this while poking around. They have both GPL and commercial options. https://www.freertos.org/FreeRTOS-Plus/Fail_Safe_File_System/Reliance_Edge_…

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Suggested order for Pacsat devos
by Burns Fisher (AMSAT) 28 Nov '22

28 Nov '22

Hi Jonathan, I'm thinking that if we want to write software before we are producing any boards, that a few more devices to attach to the Launchpad processor eval board would be good. We have the AX5043 boards that you designed which (at this point) I am assuming can be connected (Chris is currently attempting that). But what we don't have is an MRAM except for the one board that Zach designed and RIch has used (Chris has that now, and it works). We can get an MRAM on a DIP board for use in a solderless breadboard from Proto Advantage. This would require jumpers from the LaunchPad to the solderless breadboard and to the AX5043 board. Here is an example: *http://www.proto-advantage.com/store/shopping_cart.php?cartnum=8cc208e06c96db <http://www.proto-advantage.com/store/shopping_cart.php?cartnum=8cc208e06c96…>* Another possibility is to design a pretty simple little board that would plug onto a Launchpad and would have both an MRAM and either a soldered-on 5043 or a place pins/sockets for a Jonathan-5043-board. What do you think? Hope you had a good trip to the cape! 73, Burns Fisher, WB1FJ *AMSAT(R) Engineering -- Flight Software*

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Fwd: [FOXTELEM] 4th Quarter FalconSAT-3 Chicken Little Report, Thanksgiving Edition
by Chris Thompson 27 Nov '22

27 Nov '22

For anyone not on the FOX list: ---------- Forwarded message --------- From: Alan <wa4sca(a)gmail.com> Date: Sun, Nov 27, 2022 at 8:48 AM Subject: [FOXTELEM] 4th Quarter FalconSAT-3 Chicken Little Report, Thanksgiving Edition To: Fox Telemetry Analysis <foxtelem(a)amsatfox.org> As of today, 27 October 2022, this is the current predicted lifetime from the NASA DAS program: The calculated reentry date continues to move somewhat earlier, with the current expectation around 14 February, 2023. I fully expect that trend to continue. 73, Alan ----------------------------------------------- FOXTELEM mailing list -- foxtelem(a)amsatfox.org View archives of this mailing list at https://mailman.amsat.org/hyperkitty/list/[email protected] To unsubscribe send an email to foxtelem-leave(a)amsatfox.org Manage all of your AMSAT-NA mailing list preferences at https://mailman.amsat.org -- Chris E. Thompson chrisethompson(a)gmail.com g0kla(a)arrl.net

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MRAM size
by Burns Fisher (AMSAT) 26 Nov '22

26 Nov '22

It appears that there are 8Megabyte MRAM chips available at Digikey at about $50. Everspin is the brand we have been using. I think they invented the technology. 73, Burns Fisher, WB1FJ *AMSAT(R) Engineering -- Flight Software*

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AX5043 Pi Boards from Alan Johnston
by Burns Fisher (AMSAT) 19 Nov '22

19 Nov '22

Just to help you all decide about how many AX5043 Pi boards need to be built: I just heard from Alan. He only had two boards in the end. He is sending one to Jim and one to me today. I already have one board, so I may try to ensure that I can run two 5043s from a single TMS570 at some point, but if someone can use a 5043 before any can be built, let me know. 73, Burns Fisher, WB1FJ *AMSAT(R) Engineering -- Flight Software*

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Out of Office
by Jonathan Brandenburg 19 Nov '22

19 Nov '22

Just a quick notification that I'm out of the office on vacation for the next week even from my virtual and volunteer "jobs". Thus, I may not be particularly responsive. I apologize in advance for any delays! Hope everybody has a good holiday week, Jonathan -- Jonathan, KF5IDY

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Pacsat memory considerations
by Jim McCullers 18 Nov '22

18 Nov '22

We need to address Pacsat memory considerations. The MR25H40 is arranged as 8 x 512k bytes and is SPI. The higher capacity models are parallel interface that would significantly complicate the design and board space. In addition, they operate at much higher power consumption than the MR25H40. With multiple MR25H40s there will de design issues with the file system when crossing memory bounds. Burns or Rich, do you know what speed you are clocking the MR25H40? There is considerable difference in power consumption between clocking speeds of 1mhz and 40mhz. Thanks Jim McCullers WA4CWI

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Greencube Operation
by Bob Stricklin 18 Nov '22

18 Nov '22

Also in case you missed it this was an interesting post from AMSAT-BB: Frank, No secret, I use following: 1) SatPC32ISS for antenna tracking and doppler correction. 2) The doppler.SQF line I use: GREENCUBE,435309.05,435309.05,USB,USB,NOR,0,0, To note that the frequency above was adjusted with the Soundmodem waterfall to have the audio well centre on 1600Hz, basically it is the USB offset for my rig and may be different for others/different rig. 3) UZ7HO GreenCube Soundmodem and GUI: http://uz7.ho.ua/greentnc.zip<https://url.emailprotection.link/?bUV-xAXuZxO2TvYoGTz_FagEbSqWfM_2Fz9YgQs8X…>, Note matching the rig bandpass filter with the Soundmodem one (900-2100 Hz) helps to have a better S/N particularly if you have local QRM. 4) DK3WN GetKISS+ to forward telemetry (and the digipeater packets also) to Satnogs. 5) Rig is TS-2000 1k2 external TNC setting (menu 50F), TNC microHam DXP, 30 ele (15H/15V) circular Pol yagi, LNA and bandpass filter on the feeder. Same rig used for all LEO’s. 6) I also use the out-of-tree module (GNU radio developed by EA4GPZ for GreenCube https://github.com/daniestevez/gr-satellites/<https://url.emailprotection.link/?buEq4eyNl9NRYRhKUfm4VcAH7hYjpTyw9D9Ehl2sv…> in parallel to monitor the downlink. As regards the ACK message it is send only if you use Tx delay, however it is better to use Tx delay 0 for QSO to avoid unnecessary transmission by the bird (saving on-board power), with Tx delay 0 you will receive your own message as acknowledgement. Hope above may help all. 73 Jean Marc (3B8DU) Notice the user structuring his operation to save battery.

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Github write permission
by Bill 18 Nov '22

18 Nov '22

All pacsat dev team members have write access to github /AMSAT-NA/pacsat. Let me know if you have issues. Bill

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MRAM carrier and connections to Launchpad
by Rich Gopstein 18 Nov '22

18 Nov '22

https://photos.app.goo.gl/EQsRMdaacB7msysq5

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