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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/BOEI3G6IGMJ5DBRNKY2BXUB6BMXNAOTS/?format=api",
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    "message_id": "FRYP281MB0405856C411811EA5C265F49DE389@FRYP281MB0405.DEUP281.PROD.OUTLOOK.COM",
    "message_id_hash": "BOEI3G6IGMJ5DBRNKY2BXUB6BMXNAOTS",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/YP6YFAR2ZEGAEALCDRQEIZGZRSLQ22LZ/?format=api",
    "sender": {
        "address": "matthias.bopp (a) dd1us.de",
        "mailman_id": "7f39a481bfd34214adbaafe1323a6c87",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/7f39a481bfd34214adbaafe1323a6c87/emails/?format=api"
    },
    "sender_name": "Matthias Bopp",
    "subject": "[AMSAT-BB] Re: Amicalsat : 6 June S-band Transmission",
    "date": "2021-06-07T10:19:23Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/OVLCMUROUPEAAMNSAENVLA73NC3XXVJL/?format=api",
    "children": [
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/2CMXJR4G2WYTHWNHJMTR6K576TSGQKH4/?format=api"
    ],
    "votes": {
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        "status": "neutral"
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    "content": "Hi Julien,\r\n\r\nthank you very much for the confirmation.\r\n\r\nWould you like to get the I/Q file which I recorded to analyze the transmission ?\r\n\r\nKind regards\r\n\r\nMatthias\r\n\r\nwww.dd1us.de\r\n\r\n\r\n-----Ursprüngliche Nachricht-----\r\nVon: Julien NICOLAS <[email protected]> \r\nGesendet: Montag, 7. Juni 2021 10:35\r\nAn: [email protected]\r\nBetreff: [AMSAT-BB] Re: Amicalsat : 6 June S-band Transmission\r\n\r\nHi Matthias,\r\n\r\nYou where right this signal was from amicalsat, but this was not the expected signal.\r\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.\r\nWe need to wait until we get a little more power onboard.\r\n\r\nWith your setup you will be able to get a picture, or at least a part of it.\r\n\r\nI will keep the list updated.\r\n\r\nHave a nice day !\r\n\r\nJulien F4HVX\r\n\r\n\r\n\r\n> Le 7 juin 2021 à 00:04, Matthias Bopp <[email protected]> a écrit :\r\n> \r\n> Hi Julien,\r\n> \r\n> thank you very much for your answer. The exact time of the signal appearing was today 09h40m34s UTC.\r\n> \r\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.\r\n> \r\n> I could not identify any signal but I have here quite some overloading of my RX by various WLAN networks in the vicinity.\r\n> \r\n> That signal I was describing was only transmitted once and was very \r\n> distinct. As I was tracking AMICALSAT with my 2.3m dish I was quite \r\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).\r\n> \r\n> If you plan to do additional test transmissions please let me know. I \r\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.\r\n> \r\n> Are there any references with what kind of equipment the S-band \r\n> downlink of AMICALSAT has been successfully received. I have so far only seen one picture.\r\n> \r\n> Kind regards\r\n> \r\n> Matthias\r\n> \r\n> www.dd1us.de\r\n> \r\n> \r\n> -----Ursprüngliche Nachricht-----\r\n> Von: Julien NICOLAS <[email protected]>\r\n> Gesendet: Sonntag, 6. Juni 2021 22:52\r\n> An: [email protected]\r\n> Betreff: [AMSAT-BB] Re: Amicalsat : 6 June S-band Transmission\r\n> \r\n> Hi Matthias,\r\n> \r\n> This is not AmicalSat, when did you recorded it ? There is two \r\n> possibilities of failures. The first is bad attitude of the satellite \r\n> when transmitting (not nadir, remember that the ADCS is not working, \r\n> unfortunately), the second is a problem in the planed task (this is \r\n> the first time we use a planned task for a S-band transmission, I will \r\n> double check everything.)\r\n> \r\n> I will keep the list updated about the next session.\r\n> \r\n> Have a good day,\r\n> Julien F4HVX\r\n> \r\n> \r\n>> Le 6 juin 2021 à 12:53, Matthias Bopp <[email protected]> a écrit :\r\n>> \r\n>> Hi Julien,\r\n>> \r\n>> during the last pass of AMICALSAT over Europe I did not receive a 3-5 minutes long data transmission.\r\n>> \r\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.\r\n>> \r\n>> <image001.png>\r\n>> \r\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.\r\n>> \r\n>> I wonder whether this might have been a transmission of AMICALSAT.\r\n>> \r\n>> I have a I/Q baseband recording which I can make available if someone wants to try to decode the signal.\r\n>> \r\n>> Kind regards\r\n>> \r\n>> Matthias\r\n>> \r\n>> www.dd1us.de\r\n> \r\n> \r\n> -----------------------------------------------------------\r\n> \r\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.\r\n> Acceptable Use and Privacy Policies available at \r\n> https://www.amsat.org/about-amsat/\r\n> \r\n> View archives of this mailing list at\r\n> https://mailman.amsat.org/hyperkitty/list/[email protected]\r\n> To unsubscribe send an email to amsat-bb-leave(a)amsat.org Manage all \r\n> of your AMSAT-NA mailing list preferences at https://mailman.amsat.org\r\n\r\n\r\n-----------------------------------------------------------\r\n\r\nSent 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.\r\nAcceptable Use and Privacy Policies available at https://www.amsat.org/about-amsat/\r\n\r\nView archives of this mailing list at\r\nhttps://mailman.amsat.org/hyperkitty/list/[email protected]\r\nTo 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\r\n",
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