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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/SCKNWTPEXSFESMY4IBFJRIQWWYY7TG3I/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "SCKNWTPEXSFESMY4IBFJRIQWWYY7TG3I",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/GQN66W4DHOQJYEXDIZCCLWG3525EQ6AV/?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: Where we're heading for bands and services",
    "date": "2006-09-25T04:32:38Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/2XQJG5WZJIYBQKGF4LAA5OXBMPHKL2FQ/?format=api",
    "children": [
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/GELNKDFSPL5QACPZ3BF644QCFZGKUMDT/?format=api",
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/WXYKFVTAKXJLXBCAQMMKWHFOQ66YYKXX/?format=api"
    ],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Robert McGwier wrote:\n> Thank you Jim.\n> \n> John, if you would, please transmit your antenna concept drawing to the \n> group.  I really like it.\n> \n> When I answered Rick's proposal for an L band uplink in our decision \n> meeting,  I suggested that we do it with a 200 kHz limit and that final \n> bandwidth is to be determined by calculation.  I suggest we base the IF \n> for the L band input to the ACP on QSD.  It is a high dynamic range,  \n> low power mixer. We can digitize that with audio A/D's running pretty \n> low power and send I/Q to the ACP/DSP.    This will give Region 1 a few \n> uplinks to the ACP.\n\nACP?\n\n> On L band we need the SDX pick off,  the ACP pick off,  and the command \n> receiver pick off using a single antenna and any LNA.\n\nBy \"the command receiver\" do you mean a fixed frequency demodulator \noutput for the IHU3?\n\n> My first reaction to John's subsequent block diagram was that the \n> switching arrangement is complex and I did not understand the need for \n> some of the lines in it.\n> \n> S2/C is a technical win over S1/C because of the smaller antenna area on \n> the spacecraft (18 dBi fixed design) and giving us the ability to \n> separate the two antennas.  John and I discussed the spin doppler caused \n> by the offset patches.  It will be insignificant.  The noise floor at \n> the satellite on 3.4 should be considerably less than S2 and with the \n> \"region 1\" input, where we should require Class 3 EIRP or thereabouts,  \n> allows them to use the facility.\n\nI discussed some of these ideas with Eric, N7CL, at the TAPR meeting. \nEric is very good at antenna system design, did S band stuff for us at \nMMS and does this sort of thing now for DoD.\n\nAnyway, he suggested we consider Vivaldi's rather than patches.  We used \nVivaldi's on our trucks at S Band and they work well, are trivial to \nfabricate (a piece of PC board - I know, radiation, but it is the \nconcept I am wanting us to consider).  They are well behaved and have \nvery little coupling to adjacent antennas.  I'm not an antenna guy, but \nyou might want to consider the Vivaldi and/or communicate with Eric.\n\nLyle\n\n> I have really enjoyed all of the debate, design meetings, and ideas but \n> I like coming to a place where we can begin to design hardware and the \n> services.   We really do need a launch to focus on.  Those efforts are \n> ongoing and probably will be for a while.\n> \n> Bob\n> N4HY\n> \n> \n> \n> \n> Jim Sanford wrote:\n>> Team:\n>>  \n>> The Eagle Chief Technology Officer (W2GPS), the AMSAT VP Engineering \n>> (N4HY) and I met (electronically) to discuss the Eagle payload complement.\n>>  \n>> We have decided the following should be our recommendation to the board of \n>> directors of AMSAT for their ratification.  This is what will be presented to the BoD:\n>>  \n>> 1.  Services to be provided, as defined at the San Diego meeting et seq:\n>>         Class 0 is linear transponder users\n>>         Class 1 is SMS text message service users\n>>         Class 2 is weak signal voice grade digital channel\n>>         Class 3 is strong signal, large antenna, higher bandwidth signal (think compressed full motion video)\n>>  \n>>\n> --- snip  --\n>> Very 73,\n>> Jim\n>> [email protected] <mailto:[email protected]>\n> \n> \n\n\n",
    "attachments": []
}