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{ "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/CWPWFJ7UK57F6U2WMUMM3AZSTOL7B7HO/", "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/", "message_id": "CAJsuqdCRg55FkA=YZNpwMPaTBgNU77LrhEBX38YfSyuq9PiK1w@mail.gmail.com", "message_id_hash": "CWPWFJ7UK57F6U2WMUMM3AZSTOL7B7HO", "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/CWPWFJ7UK57F6U2WMUMM3AZSTOL7B7HO/", "sender": { "address": "vk5qi (a) rfhead.net", "mailman_id": "23dad5aadd4c40f18b8b50ca734586c2", "emails": "https://mailman.amsat.org/hyperkitty/api/sender/23dad5aadd4c40f18b8b50ca734586c2/emails/" }, "sender_name": "Mark Jessop", "subject": "[AMSAT-BB] Re: BCCSAT-1 launched into space", "date": "2021-03-20T21:32:47Z", "parent": null, "children": [], "votes": { "likes": 0, "dislikes": 0, "status": "neutral" }, "content": "Repeating my previous e-mail:\n\nFinally, while the extra information you have provided is useful (e.g. the\ndocumentation of the CW telemetry), it is incomplete. A closed-source\nbinary does not constitute complete documentation of your downlink\ntelemetry.\n- Table 7.1 shows a list of parameters, but it does not define the\ndata-types, or conversions for each of them. This is necessary to decode\nthe telemetry.\n- Your software decodes the SSDV imagery, but there is no information in\nyour documentation on how the imagery is encapsulated and transmitted. Is\nthis purely SSDV packets (e.g. encoded using https://github.com/fsphil/ssdv )\nencapsulated in AX.25 frames?\n\n73\nMark\n\nOn Sun, Mar 21, 2021 at 3:42 AM BCCSAT 01 <[email protected]> wrote:\n\n> Sorry for the inconvenience. We have updated our website to include Radio\n> Specifications, CW Telemetry Format, GMSK Decoder Program.\n> (http://bccsat.bcc.ac.th/amateur-radio/)\n> PS. Currently, we only have an operation manual in Thai language. However,\n> we will translate it into english as soon as possible.\n>\n> Sincerely,\n> BCCSAT-1 Team\n>\n> On Fri, Mar 19, 2021 at 6:26 PM Mark Jessop <[email protected]> wrote:\n>\n>> Hmm that does look similar doesn't it... (The block diagram for KnackSat\n>> is here:\n>> https://drive.google.com/file/d/0B4dwLLK3X59yekd6ekc5a284TEE/view )\n>>\n>> Hopefully the BCCSAT team will release information on their downlink\n>> telemetry before the launch. As per the IARU satellite coordination\n>> documentation:\n>> \"With the exception of control signals exchanged between earth command\n>> stations and space stations in the amateur-satellite service all amateur\n>> signals shall not be encoded for the purpose of obscuring their meaning. To\n>> meet this requirement, operators of satellites in the amateur-satellite\n>> service must publish full details of their modulation, encoding and\n>> telemetry formats and equations before launch.\"\n>>\n>> It's quite sad how many satellites are being launched taking advantage of\n>> the amateur radio satellite spectrum without giving anything back to the\n>> amateur radio community. I realise developing a cubesat is a challenge (I'm\n>> working on one myself... though not using the amateur bands), and that time\n>> may be short - but cubesat teams should remember that their 'free' access\n>> to amateur radio spectrum comes at the price of openness and transparency\n>> with respect to your satellites transmissions. There's heaps of amateur\n>> radio operators out there that would love to help receive telemetry from\n>> your satellites... but if you don't release any information then we can't\n>> help you.\n>>\n>> 73\n>> Mark VK5QI\n>>\n>>\n>>\n>> On Fri, Mar 19, 2021 at 7:43 AM KI7UNJ Tucker <[email protected]> wrote:\n>>\n>>> Mark,\n>>>\n>>> What it looks like to me they are using the same freq as Knacksat...\n>>> heck seems like almost the same technology on board as Knacksat.\n>>>\n>>> http://www.amsatuk.me.uk/iaru/finished_detail.php?serialnum=520\n>>>\n>>>\n>>>\n>>> On Thu, Mar 18, 2021 at 1:42 PM Mark Jessop <[email protected]> wrote:\n>>>\n>>>> Hi Tanan,\n>>>>\n>>>> Can you please point us to the specifications for your 9k6 and 1k2\n>>>> telemetry downlinks? Usage of the amateur radio band requires that\n>>>> satellite operators release all their telemetry formats. This allows\n>>>> interested amateurs to be able to have a go at decoding telemetry, and\n>>>> allows projects like SatNOGS to help collect telemetry using the huge\n>>>> networks of volunteer ground-stations.\n>>>>\n>>>> In particular I would be very interested to decode the SSDV data.\n>>>>\n>>>> Also, it looks like this frequency was not coordinated with the IARU -\n>>>> or at least it's not showing up on the IARU coordination list (\n>>>> http://www.amsatuk.me.uk/iaru/finished.php ).\n>>>>\n>>>> 73\n>>>> Mark VK5QI\n>>>>\n>>>> On Fri, Mar 19, 2021 at 5:12 AM Tanan Rangseeprom <[email protected]>\n>>>> wrote:\n>>>>\n>>>>> BCCSAT-1 is an educational multi-spectral Cubesat 1U developed by the\n>>>>> cooperation between Bangkok Christian College and the King’s Mongkut\n>>>>> university of technology north Bangkok. http://bccsat.bcc.ac.th/\n>>>>>\n>>>>> Schedule When our cubesat is completely finished it will be launched\n>>>>> into space in March 20,2021 06.07 AM UTC at Russia with the Soyuz-2.1\n>>>>> rocket by UNISAT-7 GAUSS SRL to the low earth orbit at 575 km.\n>>>>> http://en.roscosmos.ru/21973/ and https://www.roscosmos.ru/30285/\n>>>>>\n>>>>> BCCSAT-1\n>>>>> 1 99999U 21999A 21079.53571058 -.00000058 00000-0 00000+0 0 06\n>>>>> 2 99999 098.4012 345.1641 0004344 283.2593 155.6823 14.80364805 03\n>>>>>\n>>>>> Downlink Frequency\n>>>>> Beacon 435.635 MHz CW https://www.youtube.com/watch?v=hPpSTEf3PUI\n>>>>> Slow Scan Digital Video SSDV Data 435.635 MHz AFSK 1.2 kbps\n>>>>> Telemetry Data 435.635 MHz GMSK 9.6 kbps\n>>>>>\n>>>>> After launch into space if AMSAT member receives the CW signal of\n>>>>> BCCSAT-1 satellite. please send information to our team directly an email\n>>>>> to: [email protected]\n>>>>>\n>>>>> BCCSAT-1 is a technology demonstration satellite in Thailand. High\n>>>>> school students in Bangkok Cristian College in collaboration with King\n>>>>> Mongkut’s University of Technology (KMUTNB) and the Radio Amateur Society\n>>>>> of Thailand (RAST) https://www.youtube.com/watch?v=zEcg5q7ZBw0 are\n>>>>> building the satellite.\n>>>>>\n>>>>> The project aims to build capacity on systems engineering, space\n>>>>> education, and radio communication technology to students. During the\n>>>>> project, students will learn about communication technology through amateur\n>>>>> radio activities. It also encourages other interested people to receive the\n>>>>> satellite signal.\n>>>>>\n>>>>> The main missions of BCCSAT-1 include: (1) testing in-house developed\n>>>>> satellite transceiver and antenna in orbit (2) experiment of Slow-Scan\n>>>>> Digital Video (SSDV) transmission from the satellite (3) take pictures of\n>>>>> Earth by cameras onboard satellite\n>>>>>\n>>>>> BCCSAT-1 communication subsystem is an in-house developed transceiver\n>>>>> and antennas. It has the capability to transmit GMSK modulation signal at\n>>>>> 9.6 kbps, FSK for SSDV at 1.2 kbps and receive AFSK signal at 1.2 kbps. The\n>>>>> transceiver will send its parameter such as RSSI and temperature to the\n>>>>> ground station.\n>>>>>\n>>>>> BCCSAT-1 will carry four cameras onboard the satellite and aim to\n>>>>> capture images of the Earth in different wavelengths: red, green, blue,\n>>>>> NIR, and Red Edge band.\n>>>>>\n>>>>> We hope to process the images acquired for the Normalized Difference\n>>>>> Vegetation Index (NDVI) and widely used in Science education. The images\n>>>>> will be widely distributed among amateur radio community via the experiment\n>>>>> of SSDV transmission system and GMSK packets downlink. Moreover, BCCSAT-1\n>>>>> will be able to transmit pre-stored images chosen by high school students.\n>>>>>\n>>>>> BCCSAT-1 will provide the multi spectral images by having the total of\n>>>>> 5 cameras on board; Red, Green, Blue, NIR, and Red Edge bands. The images\n>>>>> we get from these cameras will be used to process for the Normalized\n>>>>> difference vegetation index (NDVI), that will significantly provides huge\n>>>>> advantage on analyzing the terrain of the country.\n>>>>>\n>>>>> 73\n>>>>> Tanan Rangseeprom , HS1JAN\n>>>>>\n>>>>> -----------------------------------------------------------\n>>>>>\n>>>>> Sent via AMSAT-BB(a)amsat.org. AMSAT-NA makes this open forum\n>>>>> available\n>>>>> to all interested persons worldwide without requiring membership.\n>>>>> Opinions expressed\n>>>>> are solely those of the author, and do not reflect the official views\n>>>>> of AMSAT-NA.\n>>>>> Not an AMSAT-NA member? Join now to support the amateur satellite\n>>>>> program!\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.\n>>>> Opinions expressed\n>>>> are solely those of the author, and do not reflect the official views\n>>>> of AMSAT-NA.\n>>>> Not an AMSAT-NA member? Join now to support the amateur satellite\n>>>> program!\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>>> *Casey Tucker KI7UNJ*\n>>> https://twitter.com/KI7UNJ\n>>>\n>>>\n\n\n", "attachments": [ { "email": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/CWPWFJ7UK57F6U2WMUMM3AZSTOL7B7HO/", "counter": 2, "name": "attachment.html", "content_type": "text/html", "encoding": "utf-8", "size": 12012, "download": "https://mailman.amsat.org/hyperkitty/list/[email protected]/message/CWPWFJ7UK57F6U2WMUMM3AZSTOL7B7HO/attachment/2/attachment.html" } ] }