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/34RBN2KKUJXQT3HLVTI56C2I6IMW5X6Z/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "34RBN2KKUJXQT3HLVTI56C2I6IMW5X6Z",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/34RBN2KKUJXQT3HLVTI56C2I6IMW5X6Z/?format=api",
    "sender": {
        "address": "jan.koekemoer (a) sunspace.co.za",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "Jan-Albert Koekemoer",
    "subject": "[amsat-bb]  SO-67 back on air!",
    "date": "2010-06-21T14:04:52Z",
    "parent": null,
    "children": [
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/BH6LUBV7AWWJMF2LPUTJ6WIHROHXI722/?format=api",
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/K57CBLARZ7O2MK2JRYB6OWDRWX77OZWN/?format=api",
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/CWHIGVURJTJ5ENYJCSE3JML6HGCS63OA/?format=api",
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/T6XR22NLXOOG5AFFVGE4S3XMAECRKPAR/?format=api"
    ],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Hello\n\n \n\nAfter much delay we are now in a position to re-activate the SA-AMSAT payload\nschedules on a regular basis again!  \n\n \n\nDuring the downtime we conducted several experiments in order to investigate\npossible alternatives for the \"cut-off\" problem experienced by many at the\nend of last year / beginning of this year.  The cut-off is caused by SW\nrunning on piggyback electronics that continues to gate the received audio\nonto the transmitter for about 3s after a specific ground transmission has\nended, whereafter the received audio is cut off.  The SW then waits for the\nnext ground transmission with a valid \"transponder\" tone embedded, before\ngating the audio onto the transmitter again.  So if a second transmission\nstarts within the 3s \"tail\" period, it will be cut off when the 3s expires.\nListen to this mp3 recording as an example:  http://tinyurl.com/38vvg3o \n\n \n\nUnfortunately the piggyback electronics does not have reprogramming\nfunctionality, so we are not able to change the SW.  We did however manage to\nimplement a mechanism on the satellite transponder (used by the piggyback)\nthat should be of some assistance when using the payload:  the PTT of the\ntransmitter now STAYS ON for the duration of the payload activation (i.e. 15\nmin), regardless of a valid \"transponder\" tone received.  Note that this does\nnot get rid of the \"cut-off\" problem, nor of the requirement to embed a valid\ntone when you want to use the payload - see detailed explanation below.\n\n \n\nThe following example depicts the ideal usage scenario of the payload:\n\n1.       As the satellite comes over the horizon, an unmodulated carrier\n(\"quieting\") will be received by all on UHF\n\n2.       Person A starts to transmit on VHF (with valid \"transponding\" tone\nembedded in the transmission) and the transmission is relayed on UHF\n\n3.       When Person A releases his/her PTT, the satellite will continue to\ntransmit what it is receiving (usually this will be \"noise\") for a further\n±3s.  Nobody should start to transmit during this time!\n\n4.       At the end of the ±3s period, everybody will again hear the\nunmodulated carrier.\n\n5.       NB: only when this unmodulated carrier is heard should Person B\nstart to transmit.  Listen to this mp3 recording as an example of valid\nusage:  http://tinyurl.com/32rjbxm \n\n \n\nI suppose this will take some getting use to - at least the system has a\nbuilt-in \"punishment\" mechanism for the impatient! ;-)\n\n \n\nPlease refer to previous posts on general voice quality optimization when\nusing the SA-AMSAT payload on SO-67.  \n\n \n\nI will request Gladys Magagula at the Satellite Application Centre to obtain\nregular schedules from the regional coordinators as soon as possible.  We\nwill start off with day passes only, transmit on 2.5W and see how things go.\n\n \n\nEnjoy!\n\n \n\nRegards\nJan-Albert\n\n \n\n________________________________________\n\nJan-Albert Koekemoer, PrEng\n\nSun Space & Information Systems (Pty) Ltd.\n\nStellenbosch, South Africa\n\nwww.sunspace.co.za <http://www.sunspace.co.za> \n\n+27 21 880 8117 (tel)\n\n+27 83 461 6643 (cell)\n\n+27 21 880 1703 (fax)\n\n \n\n\n\nE-mail Disclaimer\nhttp://www.sunspace.co.za/emaildisclaimer.htm\n\n",
    "attachments": []
}