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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/VG3LSXAKTRUBJ7NJZEA3QACCFGVBYZNB/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "VG3LSXAKTRUBJ7NJZEA3QACCFGVBYZNB",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/VG3LSXAKTRUBJ7NJZEA3QACCFGVBYZNB/?format=api",
    "sender": {
        "address": "AJ9N (a) aol.com",
        "mailman_id": "6748fe033a084371b465a1468321b4ea",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/6748fe033a084371b465a1468321b4ea/emails/?format=api"
    },
    "sender_name": "[email protected]",
    "subject": "[amsat-bb] Re: Polarization for ISS and Weather Satellites",
    "date": "2012-10-27T23:34:07Z",
    "parent": null,
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "The antennas on the ISS are ground plane type antennas for 2m and  70cm.  \nSo one could just say that the antennas are vertically  polarized.  However, \nthe ISS superstructure has gotten so big that it does  actually block or \nreflect the signal between the ISS and the ground  station.  So we recommend \nthat a circular polarized beam be used as the  polarity changes throughout the \npass.  I think most of the ARISS schools  have used RHCP but there have \nbeen a few where switching to LHCP during the pass  did help.\n \nAs a side note, the ARISS schools are to have a backup radio with an  \nantenna that has no moving parts.  Usually that means a 1/4 wave  vertical.  I \nuse a vertical and an Eggbeater for my school contacts with an  antenna switch \nbetween the two.  You might want to do the same thing with a  Quadrifilar \nand a vertical.  I always tell the backup radio operator to  switch between \nthe two during the pass and go with whichever has the greater  signal \nstrength.  They are usually stunned by the change in signal strength  between the \ntwo as the pass progresses.  The signal with the beam is much  more stable \nand stronger as expected.\n \nHope this helps.\n \n73,\nCharlie Sufana AJ9N\nOne of the ARISS mentors\n \n \n \nIn a message dated 10/27/2012 2:31:27 P.M. Pacific Daylight Time,  \[email protected] writes:\n\nI  haven't posted here in a very long time.  I hope this works.\n\nI am  building two Quadrifilar Helix antennas (from QST, August 1996); \none for  weather satellite experimentation, and one as a backup \nantenna for an  upcoming ARISS contact.\n\nI haven't found anything in the ARRL antenna  book, or on the web, \nthat specifically says that one mode (RHCP or LHCP)  of circular \npolarization is better than the other for either of the two  \napplications noted above.\n\nAny insight or experience with  polarization issues with the ISS and \nweather satellites are  appreciated.  The last time I did an ARISS \ncontact, I was plagued  with very deep fades, and want to do better this  \ntime.\n\nThanks,\nGraham\n\nGraham Dillabough, VE6KJ,  VO1DZA\n\nAlbert Einstein, when asked to describe radio,  replied:\n\n\"You see, wire telegraph is a kind of a very, very long cat.  You pull his\ntail in New York and his head is meowing in Los Angeles. Do  you understand\nthis? And radio operates exactly the same way: you send  signals here, they\nreceive them there. The only difference is that there is  no cat.\"\nAlbert Einstein (1879-1955)  \n\n_______________________________________________\nSent via  [email protected]. Opinions expressed are those of the author.\nNot an  AMSAT-NA member? Join now to support the amateur satellite  program!\nSubscription settings:  http://amsat.org/mailman/listinfo/amsat-bb\n\n",
    "attachments": []
}