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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/G7NLKTLZKKNXEZRJAMWCO7KPEOZDEEGG/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "G7NLKTLZKKNXEZRJAMWCO7KPEOZDEEGG",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/BXKOM26RJRGWBUORJY7PBWLTL2QAJH6S/?format=api",
    "sender": {
        "address": "antonio (a) qualcomm.com",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "Franklin Antonio",
    "subject": "[eagle] Re: Eagle Microwave Antenna Arrays -- RF concepts -- quad\telement RF modules",
    "date": "2007-04-02T21:22:37Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/UJYKZJ75RALGNAZUQSJPKZJ4GXPBMALX/?format=api",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "At 01:35 PM 4/2/2007, Bill Ress wrote:\n>you throw in the differential change of phase between all of them \n>due to differences in heat (temperature changes will translate to \n>phase changes in the components of PLL) and you can be chasing phase \n>adjustments all day.\n\nUh... That's a pretty nonquantitative statement.  How much phase \nchange do you think will occur due to temperature?  Why do you narrow \nin on a PLL as something that might have phase change due to \ntemperature?  All components do!  The PA for example does.  Cables \ndo.  Any architecture for this antenna has phase shifts vs \ntemperature.  I believe that the temperature differential between \nelements will be small (after all, the PAs are all dissipating the \nsame amount of power, and the satlelite is spinning), and also the \nphase change as a function of temperature will be very small.  In the \nend it will be irrelevant.\n\nTom can do some simulation to demonstrate how much phase error we can \ntolerate.  I was only gonna put phase shifters with something like 4 \nbits of control anyway.  (Probably overkill.)  Those are 22.5 degree \nsteps.  That means the phase error due to quantization is between 0 \nand 11.25 degrees, and will average 6.125 degrees.  There is another \nerror term caused by the phase shifter's internal error.  Maybe \nthat's a few degrees.  If you want to throw in a few degrees for \ntemperature variations, everything will still work fine.\n\nRemember that the resulting signal is the sum of 35 or so elements, \nso a phase error in one element has a very small affect on the \ncomposite signal.  This summing is a huge effect.\n\n\n",
    "attachments": []
}