June 2024 - pacsat-dev - mailman.amsat.org

Cursory look at compression on Pacsat
by Corey Minyard 16 Jun '24

16 Jun '24

I spent some time looking at implementations of compression algorithms. As Bob pointed out, memory can be an issue with these libraries. I was hoping to say that zlib (gzip) would be suitable, but its minimum memory requirement appears to be 128K. There appears to be a way to reduce that, but it's still probably going to be too big. Later, better algorithms like bzip are going to be even more memory intensive. I searched around and there are a large number of compression libraries that are free and designed for microcontrollers, with memory requirements in the hundreds of bytes (or even less!). None are as good as even zlib, but they are better than LZW (compress) and would be adequate. Also, more critically, they are designed to compress small amounts of data efficiently. The trouble then becomes finding one with a Java implementation, if we are planning to send the compressed data over the download or uplink. Is this something worth pursuing? -corey - AE5KM

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Launchpad working
by Bill Reed 14 Jun '24

14 Jun '24

I was able to upload software to the launchpad. It was a "stupid operator" error. Bill

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Pacsat dev mtg
by Bill 13 Jun '24

13 Jun '24

Pacsat dev mtg Thu, Jun 13, 2024 7:00 PM - 9:00 PM (CDT) Please join my meeting from your computer, tablet or smartphone. https://meet.goto.com/941540501 You can also dial in using your phone. (For supported devices, tap a one-touch number below to join instantly.) United States: +1 (571) 317-3122 - One-touch: tel:+15713173122,,941540501# Access Code: 941-540-501 Join from a video-conferencing room or system. Dial in or type: 67.217.95.2 or inroomlink.goto.com Meeting ID: 941 540 501 Or dial directly: 941540501(a)67.217.95.2 or 67.217.95.2##941540501 Get the app now and be ready when your first meeting starts: https://meet.goto.com/install

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LaunchPad Weight
by Jim McCullers 11 Jun '24

11 Jun '24

I measured the TI LaunchPad/Pacsat board combination and the weight was less than expected. The combined weight was 2.9 ounces. The TI launch pad weighs 1.6 oz and the Pacsat board 1.2. The extra combined ounce is attributed to the scales which measure only .1 degree. This is a link to the TMS370 LaunchPad web site that includes documentation as well as schematic. Jim McCullers WA4CWI

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Pacsat Alternative Receiver Front End Design
by Jim McCullers 06 Jun '24

06 Jun '24

For consideration to reduce component cost and weight without loss of performance.

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Pacsat dev mtg 6/6/2024
by Bill 06 Jun '24

06 Jun '24

Pacsat dev mtg 6/6/2024 Thu, Jun 6, 2024 7:00 PM - 9:00 PM (CDT) Please join my meeting from your computer, tablet or smartphone. https://meet.goto.com/156305253 You can also dial in using your phone. (For supported devices, tap a one-touch number below to join instantly.) United States: +1 (571) 317-3112 - One-touch: tel:+15713173112,,156305253# Access Code: 156-305-253 Join from a video-conferencing room or system. Dial in or type: 67.217.95.2 or inroomlink.goto.com Meeting ID: 156 305 253 Or dial directly: 156305253(a)67.217.95.2 or 67.217.95.2##156305253 Get the app now and be ready when your first meeting starts: https://meet.goto.com/install

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Re: Pacsat new team members
by Chris Thompson 05 Jun '24

05 Jun '24

Great, I look forward to it. Welcome Cameron and Ron. 73 Chris On Wed, Jun 5, 2024, 16:20 Bill Reed via pacsat-dev <pacsat-dev(a)amsat.org> wrote: > Two new team members will be joining us at tomorrows meeting: > > Cameron Castillo - circuit board layout > > Ron Fevig, N0UCV - Testing and user documentation > > > ----------------------------------------------------------- > > 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 new team members
by Bill Reed 05 Jun '24

05 Jun '24

Two new team members will be joining us at tomorrows meeting: Cameron Castillo - circuit board layout Ron Fevig, N0UCV - Testing and user documentation

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