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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/DS2O3NMPVMDRTXOFYC7KQKGDDP5NGW56/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "DS2O3NMPVMDRTXOFYC7KQKGDDP5NGW56",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/NHX6X5EKQIQSZSS634TXEOLCBVH3Q3HB/?format=api",
    "sender": {
        "address": "kk7p (a) wavecable.com",
        "mailman_id": "ecaeda8313f54fe6b33b16a345e6ba3a",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/ecaeda8313f54fe6b33b16a345e6ba3a/emails/?format=api"
    },
    "sender_name": "Lyle Johnson",
    "subject": "[eagle] Re: Eagle 10 MHz Clock",
    "date": "2007-04-10T03:55:17Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/N2MTLNMXZ7CXS4BERHPB6RBNB63N4B4R/?format=api",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Hello Bill!\n\nMy recollections of \"oral history\":\n\n> 1) What is the reason for requiring all LO's to be locked to a 10 MHz \n> satellite system clock or are they?\n\nEarlier transponders often had frequency uncertainties of many kHz.  For \nsome applications (I seem to recall ranging early in the life of the \nspacecraft as we're trying to stabilize it and change its orbit) knowing \nthe frequency is important.  For general QSOs it is less so, especially \nwith CAT interfaces to radios what can compensate for transponder errors \nas well as local offsets.\n\nAlso, the oscillators so referenced should be able to operate as well as \npast transponders in the absence of the 10 MHz reference.\n\nSome of this desire may have been driven by the P5A requirements, which \ndon't apply to Eagle. Doing 5 bps DBPSK signaling at S band requires \nsome pretty amazing stability and phase noise characteristics, or so I'm \ntold!\n\n> 2) Have the performance specifications for the 10 MHz clock been \n> developed and what are they (in particular phase noise, frequency \n> stability, susceptibility to digital hash, and power level available to \n> each using subsystem - to name a few)?\n\nFor Eagle, not to my knowledge.\n\n73,\n\nLyle KK7P\n\n",
    "attachments": []
}