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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/P7SJWNLVXQG7OFX3QAW43SI5OCFONS2Q/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "001501c859a4$864422a0$dd4ba30a@Phil",
    "message_id_hash": "P7SJWNLVXQG7OFX3QAW43SI5OCFONS2Q",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/P7SJWNLVXQG7OFX3QAW43SI5OCFONS2Q/?format=api",
    "sender": {
        "address": "phillor (a) telstra.com",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "Phil",
    "subject": "[amsat-bb]  Satellite tracking programming ideas",
    "date": "2008-01-18T07:26:18Z",
    "parent": null,
    "children": [
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/HS26KG4X3ZYFGLSGVEKR6P7NFLIRQUF4/?format=api",
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/XRP47AAQFHVAI7BBPAZXBLPXL6V5ALJ4/?format=api"
    ],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Thank you for reading this.\n\nI'm currently marooned because of flood water, and likely to be so for at \nleast another week, so to pass some time I decided to upgrade my satellite \ntracking program. Disappointingly, playing with the current satellites in \nthis country is pointless so the programming exercise is purely academic.\n\nOriginally, my tracking program displayed the link frequencies but I decided \nthat was unnecessary since the radio has a perfectly good display itself. So \nto make frequency corrections, due to hardware errors, or to listen to \nanother part of the downlink I simply used the radio's tuning knob. The \nprogram detected that the receiver's frequency had changed and calculated a \nnew uplink frequency.\n\nThis requires some manual intervention in that I have to stop the automatic \ntracking, turn the knob and then restart the tracking. This could take a few \nseconds which would mean that the tracking could be a few seconds behind. \nThe alternative is to click on an up / down tuning arrow which will stop the \ntracking and adjust the received frequency. Clicking on a restart button \nwould restart the tracking. I think that's the way satpc32 works.\n\nI've probably got too much time on my hands and both methods seem to work \nequally well. Does one method have an advantage over the other?\n\nThe update interval has to be fairly short so that a manual frequency change \ncan be quickly detected. I'm currently updating the radio based on time. The \nalternative is to update based on frequency, say every time the higher \nfrequency changes by 20Hz. This would lessen the number of radio updates \nduring periods where the Doppler effect is at a minimum but does it matter \nif the radio is undated unnecessary? The rotator bearing is updated every \nten degrees but that's to lessen mechanical fatigue.\n\nRegards,\nPhil. \n\n\n",
    "attachments": []
}