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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/DZ67CTIYIQZJB3SFMGOOOX6BQUU36ZOV/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "3A78C7A402D44EB79F69CA1328D11B09@Ron8300PC",
    "message_id_hash": "DZ67CTIYIQZJB3SFMGOOOX6BQUU36ZOV",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/DZ67CTIYIQZJB3SFMGOOOX6BQUU36ZOV/?format=api",
    "sender": {
        "address": "w5rkn (a) w5rkn.com",
        "mailman_id": "ce8329f57b214c74b5462b39cfe26858",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/ce8329f57b214c74b5462b39cfe26858/emails/?format=api"
    },
    "sender_name": "Ronald G. Parsons",
    "subject": "Re: [amsat-bb] Need help understanding inverting transponder",
    "date": "2015-01-31T18:40:47Z",
    "parent": null,
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "The way MacDoppler and SatPC32 handles Doppler shift is by keeping the \nfrequency a constant on both the uplink and downlink AT THE SATELLITE. This \nis commonly called Full Doppler Tuning.\n\nAs the satellite approaches you, the frequency you receive on the downlink \nis higher than the frequency at the satellite and decreases as the satellite \npasses the point of closest approach  (when the Doppler shift is zero) and \ncontinues to decrease as the satellite approaches LOS.\n\nMacDoppler compensates for the Doppler shift in order to keep the frequency \nat the satellite a constant. This is advantageous as others can join the QSO \nand everyone will be at the same frequency at the satellite. It will appear \nto you that there is no Doppler shift -- the best method and easily \naccomplished by computer control.\n\nIf you tune your receiver up or down, MacDoppler will compensate by tuning \nyour transmitter down or up by the same amount, and then compensate for \nDoppler shift as above.\n\nHope this helps.\nRon W5RKN\n\n\nMessage: 5\nDate: Tue, 27 Jan 2015 18:29:42 -0500\nFrom: Jacob Tennant <[email protected]>\nTo: AMSAT-BB <[email protected]>\nSubject: [amsat-bb] Need help understanding inverting transponder\noperation\nMessage-ID:\n<CAMM2CtW4axkair6JszYPaqXa7TEx=7V=wxF=3h8uVsHLo7iqMQ@mail.gmail.com>\nContent-Type: text/plain; charset=UTF-8\n\nI am very new to satellite operations and I am running MacDoppler on my\nhome Mac Mini computer and trying to get the modes setup as I am having a\nlittle trouble with how / where the program should be tuning my Yaesu\nFT857D.\n\nAs I think I understand it for a inverting transponder (FO-29 for example),\nthe downlink frequency range is 435.800 to 435.900 and that would be USB\nand the frequency would move lower as the pass happens starting at 435.900\nand going down to wards 435.800.\n\nThe uplink frequency range is 145.900 to 146.000 and that would be LSB and\nthe frequency would move higher as the pass happens starting at 145.900 and\ngoing up to wards 146.000.\n\nIs this correct?\n\nJake WF8S\n\n\n",
    "attachments": []
}