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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/OLPJNYR5OGTPGCIRWPOVM45C2QB7AQCS/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "070220091729.12654.4A4CEE85000139DC0000316E22230647029B0A02D2089B9A019C04040A0DBF049BCC02@att.net",
    "message_id_hash": "OLPJNYR5OGTPGCIRWPOVM45C2QB7AQCS",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/OLP64F6KQRBBVAS2MNX5NA45SHDIKQWF/?format=api",
    "sender": {
        "address": "n3tl (a) bellsouth.net",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "[email protected]",
    "subject": "[amsat-bb] Re: How you do DOPPLER correction in Linear Transponders?",
    "date": "2009-07-02T17:29:41Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/OLP64F6KQRBBVAS2MNX5NA45SHDIKQWF/?format=api",
    "children": [
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/HIMYZPRA3VIGC5LI5NNHJHUBVAZNZCVZ/?format=api"
    ],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "The latest edition of \"The ARRL Satellite Handbook\" contradicts earlier versions, which suggested the same approach that Drew has here (i.e., always Doppler-tune the higher frequency) in favor of \"parking\" the uplink frequency and Doppler-tuning the downlink (see the section \"Finding Yourself ... and Others,\" which begins on page 5-13 of the handbook). It occurs to me that, in general, that is the worst approach to take - although I admit to only knowing enough about all of this to be more dangerous than not. \n\nBefore I added computer-aided Doppler tuning to my station, I took Francesco's approach and always tried to stay at the same downlink frequency, Doppler-tuning the uplink regardless of whether it was the higher frequency. In reality, my approach is only inconsistent with Drew's ONLY on FO-29 because, on AO-7 (when in Mode B) and VO-52 (always in Mode B), the uplink IS the higher frequency. \n\nThe reason I believe the 2008 edition of  \"The ARRL Satellite Handbook\" offers the worst approach has two elements:\n\n1 - the \"slipping\" on the downlink that Francesco alludes to in his post, and\n\n2 - the use of VO-52 as the \"example satellite\" for the description of how to find one's signal. The exercise directs readers to Doppler-tune the lower of the two frequencies to find themselves on the satellite.\n\nLater today, I will try the \"always tune the higher frequency\" rule on FO-29, which I admittedly have not every tried. I'm looking forward to learning how that works for me since the higher frequency on that satelite is the downlink.\n\n73 to all,\n\nTim - N3TL\n\n\n\n-------------- Original message from Fabiano Moser <[email protected]>: -------------- \n\n\n> Dear friends, \n> \n> We know that some Satellite Operators use diferent system to doppler \n> control. \n> \n> For Linear Transponder \n> 1) Adjust uplink and downlink automatic by CAT? (Not always woks, some times \n> I´m up or down from the computer adjust) \n> 2) Adjust uplink and downlink manual \n> 3) Keep Uplink fixed and adjust only the Downlink frequency. \n> \n> What is the more indicate method to use? \n> FT-847 have knob to adjust Uplink without change downlink VFO, and I´m using \n> it to keep my voice in downlink at same downlink much I can. \n> \n> But I know some operators use fixed uplink. \n> \n> How you do? \n> \n> -- \n> 73 \n> Fabiano Moser CR7/PY5RX \n> ARISS-PORTUGAL (Amateur Radio on the International Space Station) \n> Representative at Teleconference and Portugal Telebridge Coordinator. \n> AMRAD/AMSAT-CT \n> http://www.amrad.pt/ariss.php \n> \n> \"There is no great talent without great will. (Honoré de Balzac)\" \n> _______________________________________________ \n> Sent via [email protected]. Opinions expressed are those of the author. \n> Not an AMSAT-NA member? Join now to support the amateur satellite program! \n> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb \n",
    "attachments": []
}