Email Detail

HTTP 200 OK
Allow: GET, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/3K4C6AXYXAD7ODC53SR52XWUPCLPDCRI/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "3K4C6AXYXAD7ODC53SR52XWUPCLPDCRI",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/OL4BBETINR43Y4HIY6YIKA5AOD7SWUIQ/?format=api",
    "sender": {
        "address": "daniel (a) destevez.net",
        "mailman_id": "c2eac82b839b45f5a7d3b923c1721007",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/c2eac82b839b45f5a7d3b923c1721007/emails/?format=api"
    },
    "sender_name": "Dani EA4GPZ",
    "subject": "Re: [amsat-bb] Info of Chinese Launch 2016-066",
    "date": "2016-11-20T18:57:33Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/UBUGRB3S36DCFZLNHKOMNO3A3PTXU7LY/?format=api",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "El 20/11/16 a las 19:14, Alan Kung escribió:\n> Hi Drew,\n> \n> \n> Thanks for your report! I think the problem is not lack of electric\n> energy, CAS-2T is an 2U structure, we installed solar panels on five\n> sides with 30% efficiency, average total power about 2.2 Watts, the\n> power budget: CW Beacon=0.5W, FM Transponder=0.7W, OBC=0.05W, TT&C\n> Receiver=0.12W, Total=1.37W, normally there is some superfluous power\n> to supply to heating resistances.\n> \n> What problems are I think: First CAS-2T was not separated from the\n> launch vehicle, final stage of the lauch vehicle is much bigger than\n> CAS-2T satellite, and it keeps self spin in approx. 7 seconds per\n> circle. It lead to the antenna radiation pattern becomes chaotic, the\n> gain at some positions become much lower and is accompanied by a\n> parasitic amplitude modulation. On the other hand, in order to avoid\n> chaotic signal on VHF from land in East Asia to disturb the Satellite\n> uplink , we adjusted the uplink receiver squelch at very deep\n> position, it makes the transponder opening sensitivity less than\n> -110dBm at RF input port of the receiver.\n> \n> So I think the solution is only to improve the uplink EIRP, some of\n> the high schools' club stations here using 3 meters boom antennas\n> with approx. 50W RF power to get through the transponder well.\n\nHi Alan,\n\nGiven my own observations and all the reports I've heard from other\nAmateurs, I don't agree with your explanation.\n\nIt is not a problem with the squelch or the uplink EIRP. The FM comes on\neven with an uplink of 5W to a 7el yagi. The problem is that the\ndownlink is not a clean FM modulation, but some sort of \"rubbish\".\n\nI haven't heard of anyone that succeeded to downlink his signal through\nthe FM transponder fine. People using big or small groundstations have\nthe same problem.\n\nWhat is this high schools thing? Do you mean that they were able to use\nthe CAS-2T FM repeater successfully? If so, can anyone with a big\ngroundstation give this a try and preferably do an SDR recording of the\ndownlink?\n\nMore info:\nhttp://destevez.net/2016/11/some-measurements-of-cas-2t-on-orbit-25/\n\n73,\n\nDani EA4GPZ.\n",
    "attachments": []
}