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GET /hyperkitty/api/list/[email protected]/email/YZCTDGOATRC3RCZTAEU6YHKBCVGDL5SC/?format=api
{ "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/YZCTDGOATRC3RCZTAEU6YHKBCVGDL5SC/?format=api", "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api", "message_id": "CALNQy48T33=Juk=OvNjPi7Mb53ZXK=EspHxKgoHBSaU833zd0A@mail.gmail.com", "message_id_hash": "YZCTDGOATRC3RCZTAEU6YHKBCVGDL5SC", "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/KM7W7F7VWCXYGEZLKCEYYN4NUTUJI3SK/?format=api", "sender": { "address": "ewpereira (a) gmail.com", "mailman_id": "bf62ce620f5344f48e77dcfeab534e6d", "emails": "https://mailman.amsat.org/hyperkitty/api/sender/bf62ce620f5344f48e77dcfeab534e6d/emails/?format=api" }, "sender_name": "Edson W. R. Pereira", "subject": "Re: [amsat-bb] Need help decoding EO-79 packets.", "date": "2016-04-22T00:51:48Z", "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/VINMS72JXAXKSIX2ZQH2K5N636C6HFZZ/?format=api", "children": [ "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/V6KOJFQDRDL2UGIZW3CNQCDKZN5FZWWZ/?format=api" ], "votes": { "likes": 0, "dislikes": 0, "status": "neutral" }, "content": "The AX.25 implementations used in some cubesats do not implement the specs\nfor AX.25 destination address field encoding correctly. The last bit of the\nlast byte of the destination callsing (or digipeater) field should always\nbe 1 in order to indicate the end of the destination field, but some\nimplementations keep the bit as 0. This is the reason UZ7HO's soundmodem\nsays NON-AX25 frame. Soundmodem does pass the frame to the KISS interface\nbut any decoding software must be careful during the processing of the\ndestination callsign (by assuming there are no digipeaters).\n\nComparing the performance of the 1200 bps BPSK FUNcube-1 FEC encoding with\ncubesats using AX.25 1200 bps BPSK makes me wander why in this day and age\nwe still use AX.25 for satellite links.\n\n73, Edson PY2SDR\n\n\n---\n- We humans have the capability to do amazing things if we work together.\n- Nós seres humanos temos a capacidade de fazer coisas incríveis se\ntrabalharmos juntos.\n\nOn Thu, Apr 21, 2016 at 7:56 PM, J. Boyd (JR2TTS) <\[email protected]> wrote:\n\n> On Thu, 21 Apr 2016 17:43:36 -0500, \"JoAnne Maenpaa\" <[email protected]>\n> wrote:\n>\n> > > There were some other things in my Soundmodem settings that did not\n> > > agree with the instructions for DeorbitSail, that may have messed it\n> up,\n> > > so I'll try again this morning during the next pass.\n> >\n> > I'm continuing to experiment by myself on this subject of receiving\n> > telemetry data using an SDR dongle and software. I've appreciated all the\n> > bits of information offered by the stations who are already up and\n> running.\n> >\n> > One thing I'm finding with software packet reception is that the software\n> > \"modem\" or software \"TNC\" (i.e.: soundmodem) seems to expect packets\n> with a\n> > good checksum. Just a single bit-flip and I don't have data.\n>\n> In soundmodem, I had \"Bits Recovery\" set to \"SINGLE\" initially, while\n> the DeorbitSail page seems to suggest it's more properly set to \"NONE\".\n> Not sure if that's significant, but your comment about flipped bits made\n> me suspect this. Anything's worth trying once.\n>\n>\n> --\n> J. Boyd, JR2TTS/NI3B\n> [email protected]\n> http://www.flickr.com/photos/the2belo/\n> http://www.qrz.com/db/JR2TTS\n> Twitter: @Minus2_C\n>\n> _______________________________________________\n> Sent via [email protected]. 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> Not an AMSAT-NA member? Join now to support the amateur satellite program!\n> Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb\n>\n", "attachments": [] }