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    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/ECOH53DMX4CZ3XY5L4Q3A36GA6OBG7Q3/?format=api",
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    "message_id": "CADS7kXWt=Lgv_ZOcnw0Gqzeh-tmAvs83KfWaKWurbvVup8o+xA@mail.gmail.com",
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    "sender": {
        "address": "sasha.nyc09 (a) gmail.com",
        "mailman_id": "78c33a7b1b224c3aa63512d6ad1a89e4",
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    "sender_name": "Sasha Tim",
    "subject": "[AMSAT-BB] Re: FW: Re: IO-117 status - we're back",
    "date": "2023-10-27T17:22:05Z",
    "parent": null,
    "children": [],
    "votes": {
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        "status": "neutral"
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    "content": "Hi Graham,\n\nThanks for reminding me of that one, I forgot about it!\n\n73 de VE3SVF\n\nOn Fri, Oct 27, 2023 at 11:21 AM graham shirville via AMSAT-BB <\[email protected]> wrote:\n\n> Hi Sasha,\n>\n>\n>\n> Thanks for the explanation…I had the same question my mind!\n>\n>\n>\n> Just for the record, a 1U CubeSat, JY1SAT, also successfully used SSDV to\n> downlink a number of preloaded images from Jordan.\n>\n>\n>\n> As you can see it worked really well! http://sv2hwm.ddns.net/JY1SAT.php\n>\n>\n>\n> The User Dashboard, based upon the FUNcube system, enabled one to “hole\n> file” any missing blocks during subsequent orbits.\n>\n>\n>\n> Sadly a failure in the onboard MCU some months ago means that it can no\n> longer provide these images.\n>\n>\n>\n> 73\n>\n> Graham G3VZV\n>\n>\n>\n>\n>\n> *From:* Sasha Tim via AMSAT-BB <[email protected]>\n> *Sent:* Friday, October 27, 2023 2:58 PM\n> *To:* Zach Metzinger <[email protected]>; Amsat - BBs <[email protected]\n> >\n> *Subject:* [AMSAT-BB] Re: IO-117 status - we're back\n>\n>\n>\n> Hi Zach,\n>\n>\n>\n> The reason against JPEG is primarily because of the corruption\n> capabilities. If the first packet is not received (which is often the\n> case), the entire image will be corrupt. If a single packet is missed, it\n> ruins the image for all of the packets after.\n>\n>\n>\n> Multiple satellites use raw JPEG in space currently, and it is not working\n> well.'\n>\n>\n>\n> A better format to use would be SSDV (https://github.com/fsphil/ssdv),\n> which has been tested on HAB flights for a long time, and was originally\n> implemented on an Atmega328!\n>\n>\n>\n> It retains the JPEG compression capabilities, while simultaneously\n> protecting the imagery against potential packet loss.\n>\n>\n>\n> There were only three satellites that I know of that used SSDV in space,\n> that is, GASPACS-1 and the Chinese Lunar Orbiter cubesats a while ago.\n>\n>\n>\n> On Thu, Oct 26, 2023 at 3:46 PM Zach Metzinger via AMSAT-BB <\n> [email protected]> wrote:\n>\n> On 10/26/23 14:13, Sasha Tim via AMSAT-BB wrote:\n> > Any projects working on getting into MEO: PLEASE put in a camera (and\n> > transmit in a format that is not JPEG)!\n>\n> Hello Sasha,\n>\n> Cameras do require a license, at least for the US. Not insurmountable,\n> but one has to consider this aspect.\n>\n> What's wrong with JPEG? You'd prefer GIF? (or TIFF?) :-)\n>\n> --- Zach\n> N0ZGO\n>\n> -----------------------------------------------------------\n>\n> Sent via AMSAT-BB(a)amsat.org. AMSAT-NA makes this open forum available\n> to all interested persons worldwide without requiring membership. Opinions\n> expressed\n> are solely those of the author, and do not reflect the official views of\n> AMSAT-NA.\n> Acceptable Use and Privacy Policies available at\n> https://www.amsat.org/about-amsat/\n>\n> View archives of this mailing list at\n> https://mailman.amsat.org/hyperkitty/list/[email protected]\n> To unsubscribe send an email to amsat-bb-leave(a)amsat.org\n> Manage all of your AMSAT-NA mailing list preferences at\n> https://mailman.amsat.org\n>\n>\n> -----------------------------------------------------------\n>\n> Sent via AMSAT-BB(a)amsat.org. AMSAT-NA makes this open forum available\n> to all interested persons worldwide without requiring membership. Opinions\n> expressed\n> are solely those of the author, and do not reflect the official views of\n> AMSAT-NA.\n> Acceptable Use and Privacy Policies available at\n> https://www.amsat.org/about-amsat/\n>\n> View archives of this mailing list at\n> https://mailman.amsat.org/hyperkitty/list/[email protected]\n> To unsubscribe send an email to amsat-bb-leave(a)amsat.org\n> Manage all of your AMSAT-NA mailing list preferences at\n> https://mailman.amsat.org\n>\n\n\n",
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