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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/APFP6CFFZUNYSBCIODWRMR4RRGDYJSUN/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "APFP6CFFZUNYSBCIODWRMR4RRGDYJSUN",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/FVMDWGMZ6QKZGZX27LGOWSU7QP2BYI6R/?format=api",
    "sender": {
        "address": "tosca005 (a) tc.umn.edu",
        "mailman_id": "ddd1e012a31843ce830c5bc7888b5fea",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/ddd1e012a31843ce830c5bc7888b5fea/emails/?format=api"
    },
    "sender_name": "John P. Toscano",
    "subject": "[amsat-bb] Re: VO52",
    "date": "2007-06-12T11:03:31Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/FVMDWGMZ6QKZGZX27LGOWSU7QP2BYI6R/?format=api",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "kc6uqh wrote:\n> O.K. I have a Icom 820 and for field day I intend to try VO-52 with out computer controlled anything. I have Dos 6.22 , IT and a 386 notebook. Yagis for 2M and 70cm. \n> Question should I adjust the transmit (70cm) or the receive  (2 M ) for Doppler? I relize that either will work but this is a protocall question covering only the FD operation in June.\n> Looking for some sound advise not lectures.\n> Thanks,\n> \n> Art, \n> KC6UQH\n\nWithout computer control, the conventional wisdom is leave the lower \nfrequency (2 meters) alone, and tune the higher frequency (70 cm).  This \nshould apply on Field Day (lots of rookies) just as well as under normal \nconditions.\n\nThere may also be a preference depending on your specific radio.  With \nthe Yaesu FT-847 satellite transceiver, the design of the radio is such \nthat in satellite mode with tracking turned on, the main dial controls \nboth uplink and downlink (that's what is \"tracking\"), and the sub dial \ncontrols the uplink only, so you can correct for Doppler.  In the case \nof VO-52, the uplink is 70 cm so there is no conflict. But with Mode J \nsatellites (FO-20, R.I.P., and FO-29, hoping for resurrection) the \nuplink is the lower frequency and so the design of the radio is contrary \nto the \"tune for Doppler with the high frequency\".  As it turns out, I \nfind the sub-tune knob on the FT-847 a real pain in the @$$ to use for \ntuning Doppler, and impossible unless I put the radio into \"Fast Tune\" \nmode.  So I cheat.  I turn on tracking, find a station by tuning the \nmain dial, TEMPORARILY disable VFO tracking, adjust the main dial until \nI hear my downlink, then re-enable VFO tracking. At that point, I can \ntune up and down the passband and the uplink/downlink frequencies stay \nin sync for a short time. Obviously, as the pass progresses, the Doppler \nshift changes, and about 3x as fast on the 70 cm band, so you need to \ncontinue adjusting, but once you have your downlink and uplink \nsynchronized, if you REMEMBER to RE-ENABLE TRACKING, you can quickly \ntune up or down the passband to another station and be at least close to \nbeing tuned in on both.\n\nYMMV with the Icom 820.  It's been many years since I've seen or touched \none of them, although the first satellite contact I ever heard was made \non one during Field Day by an experienced satellite operator (N0BEL).\n\nGood luck!\nW0JT\nField Day 2007 VHF/Satellite Station Manager, Twin Cities Repeater Club, \noperating as W0BU from Minnesota.  (We have been a 3A station as long as \nI've been around, but this year may be a 2A station.)\n",
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}