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{ "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/2CMXJR4G2WYTHWNHJMTR6K576TSGQKH4/?format=api", "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api", "message_id": "[email protected]", "message_id_hash": "2CMXJR4G2WYTHWNHJMTR6K576TSGQKH4", "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/YP6YFAR2ZEGAEALCDRQEIZGZRSLQ22LZ/?format=api", "sender": { "address": "contact (a) juliennicolas.com", "mailman_id": "99a5052c42c04892885a9656c8e7b17d", "emails": "https://mailman.amsat.org/hyperkitty/api/sender/99a5052c42c04892885a9656c8e7b17d/emails/?format=api" }, "sender_name": "Julien NICOLAS", "subject": "[AMSAT-BB] Re: Amicalsat : 6 June S-band Transmission", "date": "2021-06-07T20:41:35Z", "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/BOEI3G6IGMJ5DBRNKY2BXUB6BMXNAOTS/?format=api", "children": [ "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/MC634WR7M2F7DPCZ6B7WYT3VL6MQALO2/?format=api" ], "votes": { "likes": 0, "dislikes": 0, "status": "neutral" }, "content": "Hello Matthias,\n\nIt is interesting to have a look to the file if you can send me a download link.\n\nHave a nice day.\n\nJulien\n\n\n> Le 7 juin 2021 à 12:19, Matthias Bopp <[email protected]> a écrit :\n> \n> Hi Julien,\n> \n> thank you very much for the confirmation.\n> \n> Would you like to get the I/Q file which I recorded to analyze the transmission ?\n> \n> Kind regards\n> \n> Matthias\n> \n> www.dd1us.de\n> \n> \n> -----Ursprüngliche Nachricht-----\n> Von: Julien NICOLAS <[email protected]> \n> Gesendet: Montag, 7. Juni 2021 10:35\n> An: [email protected]\n> Betreff: [AMSAT-BB] Re: Amicalsat : 6 June S-band Transmission\n> \n> Hi Matthias,\n> \n> You where right this signal was from amicalsat, but this was not the expected signal.\n> We had a power supply problem during the S-band transmission. Since this failed transmission we lost the satellite, no beacon, nor answers to TC.\n> We need to wait until we get a little more power onboard.\n> \n> With your setup you will be able to get a picture, or at least a part of it.\n> \n> I will keep the list updated.\n> \n> Have a nice day !\n> \n> Julien F4HVX\n> \n> \n> \n>> Le 7 juin 2021 à 00:04, Matthias Bopp <[email protected]> a écrit :\n>> \n>> Hi Julien,\n>> \n>> thank you very much for your answer. The exact time of the signal appearing was today 09h40m34s UTC.\n>> \n>> I did monitor the downlink of AMICALSAT at the time you had suggested starting 09:30 UTC for about 20 minutes and then also the next pass.\n>> \n>> I could not identify any signal but I have here quite some overloading of my RX by various WLAN networks in the vicinity.\n>> \n>> That signal I was describing was only transmitted once and was very \n>> distinct. As I was tracking AMICALSAT with my 2.3m dish I was quite \n>> sure it came from that direction. However as you know the transmissions from AMICALSAT better, apparently it was a different signal. Decreasing doppler shift of that signal was also in agreement with the fact that AMICALSAT was moving away from me (shortly after TCA).\n>> \n>> If you plan to do additional test transmissions please let me know. I \n>> might add a very narrowband filter around 2415 MHz to suppress the WLAN Interference. In understand that the satellite's attitude is out of control but I would expect at least a weak fading signal to be seen.\n>> \n>> Are there any references with what kind of equipment the S-band \n>> downlink of AMICALSAT has been successfully received. I have so far only seen one picture.\n>> \n>> Kind regards\n>> \n>> Matthias\n>> \n>> www.dd1us.de\n>> \n>> \n>> -----Ursprüngliche Nachricht-----\n>> Von: Julien NICOLAS <[email protected]>\n>> Gesendet: Sonntag, 6. Juni 2021 22:52\n>> An: [email protected]\n>> Betreff: [AMSAT-BB] Re: Amicalsat : 6 June S-band Transmission\n>> \n>> Hi Matthias,\n>> \n>> This is not AmicalSat, when did you recorded it ? There is two \n>> possibilities of failures. The first is bad attitude of the satellite \n>> when transmitting (not nadir, remember that the ADCS is not working, \n>> unfortunately), the second is a problem in the planed task (this is \n>> the first time we use a planned task for a S-band transmission, I will \n>> double check everything.)\n>> \n>> I will keep the list updated about the next session.\n>> \n>> Have a good day,\n>> Julien F4HVX\n>> \n>> \n>>> Le 6 juin 2021 à 12:53, Matthias Bopp <[email protected]> a écrit :\n>>> \n>>> Hi Julien,\n>>> \n>>> during the last pass of AMICALSAT over Europe I did not receive a 3-5 minutes long data transmission.\n>>> \n>>> However I did receive a short transmission at 2414.957 MHz at 09h40m34s UTC which lasted only a few seconds. Enclosed is a screenshot.\n>>> \n>>> <image001.png>\n>>> \n>>> I have a lot of noise due to many WLAN stations close by. The frequency in the screenshot of 415.375 MHz corresponds to a receive frequency of 2414.957 MHz.\n>>> \n>>> I wonder whether this might have been a transmission of AMICALSAT.\n>>> \n>>> I have a I/Q baseband recording which I can make available if someone wants to try to decode the signal.\n>>> \n>>> Kind regards\n>>> \n>>> Matthias\n>>> \n>>> www.dd1us.de\n>> \n>> \n>> -----------------------------------------------------------\n>> \n>> Sent via AMSAT-BB(a)amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of 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 Manage all \n>> of your AMSAT-NA mailing list preferences at https://mailman.amsat.org\n> \n> \n> -----------------------------------------------------------\n> \n> Sent via AMSAT-BB(a)amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA.\n> Acceptable Use and Privacy Policies available at 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 Manage all of your AMSAT-NA mailing list preferences at https://mailman.amsat.org\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 expressed\n> are solely those of the author, and do not reflect the official views of AMSAT-NA.\n> Acceptable Use and Privacy Policies available at 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 https://mailman.amsat.org\n\n", "attachments": [] }