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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/URHF7FZW6SW65XYWL5OS4346YNH544NF/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "9EDA12EC5E8543A3BCD27977AEEEF73F@KC6UQH",
    "message_id_hash": "URHF7FZW6SW65XYWL5OS4346YNH544NF",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/2OBISJ3GIINB4FUCG3G7N3PSGSMALBEV/?format=api",
    "sender": {
        "address": "kc6uqh (a) cox.net",
        "mailman_id": "d9201820d18047e4a2772c86bda5e111",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/d9201820d18047e4a2772c86bda5e111/emails/?format=api"
    },
    "sender_name": "Art McBride",
    "subject": "[amsat-bb] Re: antenna question",
    "date": "2009-10-23T04:08:47Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/DREIQRTS2ESJHJJYDWPRBHX7KREJYLEH/?format=api",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Samudra,\nYou could use a polar mount and preset mast angle and azmuth before each\npass. That will give you a single axis control. Most antennas are moer that\n30 degrees in beamwidth, the system only needs to be close +/- 15 degrees to\nhave max signal.\n\nArt,\nKC6UQH\n\n-----Original Message-----\nFrom: [email protected] [mailto:[email protected]] On\nBehalf Of Samudra Haque\nSent: Thursday, October 22, 2009 12:16 PM\nTo: Amsat-bb\nSubject: [amsat-bb] Re: antenna question\n\nWhile searching for public text concerning Amateur satellites and\nphased array antennas, I came across this gem from our very own Tom\nClark, K3IO\nhttp://mysite.verizon.net/w3iwi/electronic_scanning_antennas.pdf,\n\"Electronic Scanning Antennas for Amateur Spacecraft\". I wonder if\nthis knowhow could be utilized for ground stations to have antennas\nthat could rapidly switch between different birds by a software reload\nfunction and a intelligent switching matrix ?\n\nHow many of you would prefer (if a command station) to have\nmulti-access to satellites as they pass during conjunction but use a\nsmall antenna farm selectively to access them _simultaneously_.\n\nOn Thu, Oct 22, 2009 at 3:06 PM, Samudra Haque <[email protected]>\nwrote:\n> Hi, Amsat-BB\n>\n> Are there any antenna designs that use predominantly rotating\n> sub-reflectors and a reflector for tracking LEO birds, in contrast to\n> rotating the main antenna structure on booms in the AZ-EL directions ?\n> I am aware of multi-LNB antenna arrangements, thought it would be\n> interesting to find out ways to keep a fairly large reflector constant\n> on the ground and use a smaller steerable sub-reflector or horn feed\n> to aim the beam ?\n>\n> Any ideas ?\n>\n> Samudra N3RDX\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__________ Information from ESET NOD32 Antivirus, version of virus signature\ndatabase 4535 (20091023) __________\n\nThe message was checked by ESET NOD32 Antivirus.\n\nhttp://www.eset.com\n\n\n \n\n__________ Information from ESET NOD32 Antivirus, version of virus signature\ndatabase 4535 (20091023) __________\n\nThe message was checked by ESET NOD32 Antivirus.\n\nhttp://www.eset.com\n \n\n",
    "attachments": []
}