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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/GQPSPYE7OYHFCZ5UKFF26GSWSPIL52LS/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "CAB4OBPUNA=hXz_2LTx9HUr5Sh0idkO+_Uyi15JQuPMOjhjVu4A@mail.gmail.com",
    "message_id_hash": "GQPSPYE7OYHFCZ5UKFF26GSWSPIL52LS",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/YRRHQWCBNGSOA3MYQRVZKNZPNANHFHLQ/?format=api",
    "sender": {
        "address": "dave (a) thejohnsonsonline.net",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "David Johnson",
    "subject": "[amsat-bb] Re: General Telemetry Question",
    "date": "2013-12-09T14:49:33Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/YRRHQWCBNGSOA3MYQRVZKNZPNANHFHLQ/?format=api",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Hi,\n\nIn the case of FUNcube the on board sensors give their readings as n bit\nvalues when they are interrogated. This data is agregated into a data frame\nfor transmission using forward error correction to improve the s/n ratio.\n\nThe problem with on board conversion is that you would have to store the\nscaling/offset/logarithmic values for all channels on board, in rom.\n\nThese are usually only characterised during thermal cycling / illumination\ntesting etc and would have to be uploaded to the satellite rom. Not\nnecessarily a simple task.\n\nIt is easier to do it on the ground where we can tweak the calculation\nfactors.\n\n73\n\nDave, g4dpz\nOn 9 Dec 2013 13:52, \"Dave Marthouse\" <[email protected]> wrote:\n\n> I noticed over the years that satellite beacon downlinks transmit their\n> telemetry in a form that must be translated by a telemetry app to their\n> engineering values. Since the information is transmitted from the\n> satellites\n> why not provide the engineering values in the downlink without the extra\n> step having to be done on the ground?  What is the logic of doing this?\n>\n>\n>\n>\n>\n> Dave Marthouse N2AAM\n> [email protected]\n>\n>\n> _______________________________________________\n> Sent via [email protected]. Opinions expressed are those of the author.\n> Not an AMSAT-NA member? Join now to support the amateur satellite program!\n> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb\n>\n",
    "attachments": []
}