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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/A4UREKXRVABQ4DZO4WMMF27WK4X4HRVT/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "001201c8f102$9e4352e0$0401010a@Dell1",
    "message_id_hash": "A4UREKXRVABQ4DZO4WMMF27WK4X4HRVT",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/A4UREKXRVABQ4DZO4WMMF27WK4X4HRVT/",
    "sender": {
        "address": "alancresswell (a) xtra.co.nz",
        "mailman_id": "0292a8a18be44d6a9fd4a622af40d892",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/0292a8a18be44d6a9fd4a622af40d892/emails/"
    },
    "sender_name": "Alan Cresswell",
    "subject": "[amsat-bb] Re: Delfi C3 transponder frequencies ?",
    "date": "2008-07-28T22:38:10Z",
    "parent": null,
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Hi David and Ib,\n\n \n\nDelfi transponder was operating over ZL on the 2132 UT pass a short while\nago.\n\n \n\nStarted with a 6.3kHz offset (Satellite input on 435.5495MHz, Output on\n145.9068MHz).  This drifted down to about a 6kHz offset at the end of the\npass.\n\nGood beacon signals until Delfi was about 61 deg S  when it sounded as\nthough it was FMing and the note became rough for about 2 minutes.\n\nLittle or no signal back from the transponder.\n\nIt recovered before LOS a few minutes later.\n\nNote that Delfi has been in full sun for more than half its orbit before it\nhits ZL and progressively loses the sun before going into eclipse South of\nZL so the above may not represent what happens as Delfi comes out of eclipse\nin the Northern hemisphere.\n\n \n\nAll very interesting.  Still no one to talk to in this part of the world.\n\"Heard in VK\" is the best so far.  Next pass is 4 Deg low to West (over VK)\nso perhaps this time if the transponder is still on.\n\n \n\nAlan\n\nZL2BX\n\n \n\n  _____  \n\nFrom: [email protected] [mailto:[email protected]] \nSent: Monday, 28 July 2008 13:37\nTo: [email protected]; [email protected]\nSubject: Re: [amsat-bb] Re: Delfi C3 transponder frequencies ?\n\n \n\nHi Alan / Ib\n\n \n\nI never thought I would say this.....but part of the answer is on you tube.\n\n \n\n \n\nhttp://www.youtube.com/watch?v=vYcl48K5qBE\n\n \n\nIf you watch the video carefully, then you can see with a little stopping\nand starting the two frequencies on their radio when they were testing the\ntransponder.  It's about 1min 20sec into the video.\n\n \n\n145.9005  =  435.5512\n\n \n\nSo that would seem consistent with Alan's observation and equating to a\nnominal clean room temperature.   However, certainly seems to be that an\noffset has been there from the moment the transponder was finished.\n\n \n\nThanks\n\n \n\nDavid\n\n \n\n \n\n \n\n \n\nIn a message dated 27/07/2008 20:27:18 GMT Standard Time,\[email protected] writes:\n\n\nHi all,\n\nOn the one good pass over ZL so far I had to use a +6kHz offset on my uplink\nto receive on the nominal downlink frequency.\ni.e. satellite input frequency of 535.556 (nominal 435.550) to hit the\n145.900 satellite output frequency.\n\nAlan\nZL2BX\n\n \n\n",
    "attachments": []
}