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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/T3N5EQZ4SMDZZSV4E5KZWYDLKLZ7JAMJ/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "T3N5EQZ4SMDZZSV4E5KZWYDLKLZ7JAMJ",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/EKUDXYKHK5GFZBJBDILTUCJRDYFTDOTJ/?format=api",
    "sender": {
        "address": "ko6th_greg (a) hotmail.com",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "Greg D.",
    "subject": "[amsat-bb] Re: probably simple",
    "date": "2010-01-08T06:16:02Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/EKUDXYKHK5GFZBJBDILTUCJRDYFTDOTJ/?format=api",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "\nHi all,\n\nHere's my (updated!) answer:\n\nI think you're going to need to\ndepend on a computer prediction program.  I use Predict on Linux, but\nthere is also a PC version.  Predict, at least, can tell you what the\ndoppler-adjusted up and downlink would be for a specific satellite-perceived frequency pair.  I have mine set\nup for mid-bandpass up and down on the linear birds, i.e. what the zero\ndoppler values are for the satellite itself.  The program then tells me\nwhat I should tune the radios to, so that the satellite hears my\nsignal at mid-bandpass, and I hear the return at the correct pitch. \nThen, if your sked is at some other frequency you'll need to add or\nsubtract to compensate.  For example, if the sked is set up for 10 khz\nabove mid-passband, I think you can just add 10 khz from your\ncomputer-predicted uplink, and subtract 10 khz from the predicted\ndownlink (for an inverting passband), and be really close.  If the sked\nis 10 khz below mid-band, subtract 10 from the up, and add 10 to the\ndown.  Both you and the other station will need to do the same thing,\nboth focusing on the satellite's perception of your signals.  Your\nindividual numbers could be very different.\n\nI hope I've got it right this time,\n\nGreg  KO6TH\n\n\nDate: Fri, 8 Jan 2010 05:58:39 +0000\nFrom: [email protected]\nTo: [email protected]\nCC: [email protected]; [email protected]\nSubject: Re: [amsat-bb] Re: probably simple\n\n\n\nHi Greg, Drew, etc\n\nThis conversation is starting to make my head hurt!  My example is to connect with some of our European friends.  Some of them I share maybe a 60 second window, with PA1TNO it is less than 30 seconds.  I have had several false starts in that I heard Paul 2E1EUB, by the time I located my downlink on his, he was gone.  I want to predetermine where to set my uplink for a given downlink.  There just is no the time be looking around.  Like I said this is probably simple I'm just have trouble getting my thinking around the concept.  Also if say I am planning on a downlink of 145.950 will Paul be looking at the same frequency?  In the past these concepts never concerned me as there was always plenty of time to yak it up with the locals on AO-7.\n\n73 Bob W7LRD\n\nCN87 Seattle, Wa.\n\n \n\n \n\n \n\n\n----- Original Message -----\nFrom: \"Andrew Glasbrenner\" <[email protected]>\nTo: \"Greg D.\" <[email protected]>\nCc: [email protected], [email protected]\nSent: Thursday, January 7, 2010 9:30:44 PM GMT -08:00 US/Canada Pacific\nSubject: Re: [amsat-bb] Re: probably simple\n\n\n>\n>\n> But any pass where you are really stretching the footprint is going to \n> be a low elevation pass.  The more you stretch, the lower the pass.  \n> In the limit, I think Bob's ultimate pass has a peak at .001-degrees \n> for both stations.  If you're doing that, then you're at TCA, and zero \n> doppler.\n>\n> That's all I meant to convey,\n>\n> Greg  KO6TH\nI understand, but with all due respect your assumption is incorrect that \nlong distance QSOs are always at TCA and zero Doppler, even \ntheoretically . This is only the case when the two stations are at near \nright angles to the track of the satellite.\n\nUse the following example. If I want to work LU5BOJ/O in FG75 from EL88 \non HO-68, my only windows are at either LOS or AOS, depending on whether \nit is an ascending or descending pass. Neither pass will be a low pass \nfor either station, and neither QSO will occur at TCA or zero Doppler.\n\nIn Bob's case, let's look at his next possible window with Paul, 2E1EUB \nin IO92. Bob is in CN76. At the beginning of the 1 minute window \ntomorrow at 1251Z, Bob's Doppler shift on 432 is -3.68 khz.\n\nOn the next mutual window at 1452Z, the beginning Doppler is -7.93 khz. \nOn the next, at 2020Z, it's -8.3 khz. None of these windows are over 2 \ndegrees elevation, and none are at TCA for either station.\n\nWhen you have 60s to make the QSO, being right dead on frequency is \nessential.\n\nRespectfully,\nDrew KO4MA\n\n \t\t \t   \t\t  \n_________________________________________________________________\nHotmail: Free, trusted and rich email service.\nhttp://clk.atdmt.com/GBL/go/196390708/direct/01/",
    "attachments": []
}