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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/IGD5MAMIJGHCNTWZM76IG5AMYSCV6TQP/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "005201ca910c$8bebec50$0a01a8c0@danc694ff4ff74",
    "message_id_hash": "IGD5MAMIJGHCNTWZM76IG5AMYSCV6TQP",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/IGD5MAMIJGHCNTWZM76IG5AMYSCV6TQP/?format=api",
    "sender": {
        "address": "daniel.f6cdz (a) orange.fr",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "Daniel F6CDZ",
    "subject": "[amsat-bb]  Doppler effect",
    "date": "2010-01-09T09:16:53Z",
    "parent": null,
    "children": [
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/3JRVL7CZWUSMIOY7LSYLAYB2DOW7J4B3/?format=api"
    ],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Hello to all.\nMy little contribution for an explanation about the doppler effect....\n73, Daniel F6CDZ loc: JN39BE\n\nDoppler effect\n\n\n\nThe Doppler effect is an immediate gap of the received frequency when the distance varies between the point of broadcast and the point of reception.\nThe variation of frequency depends on the relative speed of link or on estrangement between the satellite and the station ground, of the angle of movement and the emitted frequency. \n\nThe Doppler effect varies with the position of the satellite on its orbit, because the relative speed varies with this position.\nThe frequency increases when the satellite approaches, it decreases when it goes away from the observer.\n\n\n\nThe \"simple\" formula is :\n\n\n\n     F real = F nom (1 + V/C)         \n\n             \n\n     \n\n    V = relative speed of the sat on Km/s\n\n    C = light speed (300.000 Km/s)\n\n\n\n    1+ or 1- depending of the direction sat/operator (to the operator or from the operator)\n\n \n\n\n\nMode NORmal  and  REVerse :\n\n \n\n¾ NOR        : if I increase 1 KHz on VHF, the UHF increases also of 3 KHz => total gap (+1 + +3) = + 4 KHz\n\n¾ INV(REV)   : if I increase 1 KHz on VHF, the UHF decreases of 3 KHz => total gap (+1 - 3) = - 2 KHz\n",
    "attachments": []
}