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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/LC5CVGO5AM6DMEQIHOZA6RHJA4PJNXZE/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "LC5CVGO5AM6DMEQIHOZA6RHJA4PJNXZE",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/KMX7JNE3JKZQIQQLXOACJNQH2GA7TPG3/?format=api",
    "sender": {
        "address": "rwmcgwier (a) comcast.net",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "Robert McGwier",
    "subject": "[eagle] Re: Proposed Eagle Antenna Arrays",
    "date": "2006-09-28T04:56:06Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/KAO5T57TGNKYK6JKSPP2ZEHXE7EDR5SZ/?format=api",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "The class 1 demodulator can be aided by increasing the carrier leakage \nto aid in this tracking.  Even if this means decreasing the bit rate.  \nThe spin rate will probably be lower than this.  The high spin rates,  \nused for motor burns,  will not be in use when the Class 1 facility is \nin use (after we release the spacecraft for use).  I think Stacey wants \n\"about 10 rpm\" or so for sensors.   I recall him saying this number. \n\nI simply cannot believe we missed possibly the single biggest marketing \ntool we can have for SDX: the end of  spin modulation on the SSB \nbandwidth signals. If the computational burden is actually low enough \nfor this to be done to reduce the impact of the spin by a factor of \n10-100 (power),  it will be a big time win and a huge marketing tool for \nus to exploit. \n\nBob\n\n\n\[email protected] wrote:\n> What is the carrier tracking loop bandwidth?  I'm kind of sruprised it\n> can't compensate a maximum 1/4 Hz sinusoidal phase modulation.  (The\n> maximum spin rate is still spec'd at 15 rpm, right?)\n>\n> Al N1AL\n>\n>   \n>>   On Sep 27, 2006, at 1:41 PM, John B. Stephensen wrote:\n>>\n>>\n>>     The designer of the code to demodulate class 1 uplinks in the SDX\n>> needs to determine whether spin modulation can be compensated for. The\n>> carrier tracking loop bandwidth may be close enough to the satellite\n>> spin rate that it can't be eliminated. I'm not sure how well open loop\n>> compensation would work as the phase pertubation will vary with the\n>> arrival angle of the signal and this could vary by as much as 30\n>> degrees at MA32 and MA224.\n>>\n>>     73,\n>>\n>>     John\n>>     KD6OZH\n>>     \n>\n>\n> _______________________________________________\n> Via the Eagle mailing list courtesy of AMSAT-NA\n> [email protected]\n> http://amsat.org/mailman/listinfo/eagle\n>\n>   \n\n\n-- \nAMSAT VP Engineering. Member: ARRL, AMSAT-DL, TAPR, Packrats,\nNJQRP/AMQRP, QRP ARCI, QCWA, FRC. ARRL SDR Wrk Grp Chairman\n\"You see, wire telegraph is a kind of a very, very long cat.\nYou pull his tail in New York and his head is meowing in Los\nAngeles. Do you understand this? And radio operates exactly\nthe same way: you send signals here, they receive them there.\nThe only difference is that there is no cat.\" - Einstein\n\n",
    "attachments": []
}