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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/7XQFILDVFIVVGH6SUHU36O46SUX6UJTY/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "[email protected]",
    "message_id_hash": "7XQFILDVFIVVGH6SUHU36O46SUX6UJTY",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/7XQFILDVFIVVGH6SUHU36O46SUX6UJTY/",
    "sender": {
        "address": "archie.hackett (a) hotmail.com",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "John Hackett",
    "subject": "[amsat-bb] Re: doppler.",
    "date": "2007-09-02T11:16:17Z",
    "parent": null,
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Hi All,\n        Re: doppler. I've attached K4GMJ's article from the August 1992 \nissue of Oscar News. It may be of interest to those, like me, who still use \nold equipment.\n\nIn addition to Maury's notes, I can mention, I have used an NE 567 tone \ndecoder IC and a LED as the visual receiver with a simple twin-T audio \noscillator for the transmitted signal.\nA simple twin-T osc: is better than an NE555 in this application.\n\nI still operate with the Yaesu 290/790 pair + associated homebrew aerials \nand amps (over 20 years now) and manage quite nicely on VO-52 with \nInstantTUNE. When set up correctly, the signals track perfectly so even with \n\"old\" equipment it's still possible to adhere to THE ONE TRUE RULE regarding \ndoppler.\n\nI don't tune at all for doppler on AO-7.\n\nOccasionally, just for fun, I tune manually ... (transmitter and receiver) \n.... to keep the frequency constant at the satellite, however ... be aware \n.... it is *NOT* mandatory to keep the signal fixed at the satellite. Many \noperators still use the manual convention of tuning the highest frequency \n.... (because it has the highest doppler rate).\n\nThis is perfectly acceptable because not everybody is either 1) affluent \nenough to be able to afford the latest all singing, all dancing multimode \nrig ... or 2) not experienced enough to cope with doppler on the uplink and \nthe downlink at the same time.\n\n73 John.   <[email protected]>\n\n",
    "attachments": []
}