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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/OVLCMUROUPEAAMNSAENVLA73NC3XXVJL/?format=api",
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    "message_id": "[email protected]",
    "message_id_hash": "OVLCMUROUPEAAMNSAENVLA73NC3XXVJL",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/YP6YFAR2ZEGAEALCDRQEIZGZRSLQ22LZ/?format=api",
    "sender": {
        "address": "contact (a) juliennicolas.com",
        "mailman_id": "99a5052c42c04892885a9656c8e7b17d",
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    "sender_name": "Julien NICOLAS",
    "subject": "[AMSAT-BB] Re: Amicalsat : 6 June S-band Transmission",
    "date": "2021-06-07T08:34:49Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/OAZRYGYS6RKNFGJPVNLF66DOULV6CWDX/?format=api",
    "children": [
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/BOEI3G6IGMJ5DBRNKY2BXUB6BMXNAOTS/?format=api"
    ],
    "votes": {
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    "content": "Hi Matthias,\n\nYou where right this signal was from amicalsat, but this was not the expected signal.\nWe had a power supply problem during the S-band transmission. Since this failed transmission we lost the satellite, no beacon, nor answers to TC.\nWe need to wait until we get a little more power onboard.\n\nWith your setup you will be able to get a picture, or at least a part of it.\n\nI will keep the list updated.\n\nHave a nice day !\n\nJulien 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 distinct. As I was tracking AMICALSAT with my 2.3m dish I was quite sure it came \n> from that direction. However as you know the transmissions from AMICALSAT better, apparently it was a different signal. Decreasing doppler shift of \n> 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 might add a very narrowband filter around 2415 MHz to suppress the WLAN \n> 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 downlink of AMICALSAT has been successfully received. I have so far only seen one\n> 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 possibilities of failures. The first is bad attitude of the satellite when transmitting (not nadir, remember that the ADCS is not working, unfortunately), the second is a problem in the planed task (this is the first time we use a planned task for a S-band transmission, I will 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 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",
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}