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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/T6ZXSXL4HNDCJESCNXTGUKQAW57P7QKM/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "T6ZXSXL4HNDCJESCNXTGUKQAW57P7QKM",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/NIBAD6O77SIOELIOMUO7CAY5FN5XOXD2/?format=api",
    "sender": {
        "address": "oz1my (a) privat.dk",
        "mailman_id": "b2f56900318d4d1193159750f39aa3fe",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/b2f56900318d4d1193159750f39aa3fe/emails/?format=api"
    },
    "sender_name": "OZ1MY",
    "subject": "[amsat-bb] Re: Arrow Antennas twist or not",
    "date": "2009-08-16T22:21:05Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/TJBWQAAJX7LPT4UFDFAJXASCKJXRIKVM/?format=api",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Hi all,\nI think we need some clarification.\n\nWhich satellite(s)are we talking about, when receiving with the ARROWS\nantenna ?\nThe ARROW antenna are linearly polarised.\n\nWhat latitude is your QTH ?\n\nRegarding satellites - some have linear polarisation - some have circular\npolarisation.\nAO-51 has Right Hand Circular Polarisation on the \"normal\" repeater downlink\n(435.300 MHz),\nSO-50 has linear polarisation - the same applies to AO-27.\n\nThe satellites attitude are stabilised with permanet magnets. This may give\ndifferent results\ndepending upon where you are.\n\nHere in Copenhagen it is a great advantage to \"twist\" the ARROWS antenna to\nimprove\nthe downlink signal from AO-27. We are close to the North Pole (hi)\n\nEveryone may be right :-)\n\n73 OZ1MY\nIb\n----- Original Message ----- \nFrom: \"Roger Kolakowski\" <[email protected]>\nTo: \"Clint Bradford\" <[email protected]>; <[email protected]>\nSent: Sunday, August 16, 2009 11:34 PM\nSubject: [amsat-bb] Re: Arrow Antennas\n\n\n> I will say that I can improve my 437 reception by rotating the beam...I\nalso\n> have gotten better signals by aiming the beam at a point on the ground 100\n> feet away...\n>\n> Why criticize? Everyone else can do anything they want to their antennas\n> without me getting upset...afterall, it's not MY antenna.\n>\n> Now if someone wants to point me toward scientific theory, antenna\nmodeling\n> programs, propagation theory...then I can stand up and listen...until\nthen,\n> my best signal is most important to me.\n>\n> Roger\n> WA1KAT\n>\n>\n> Roger\n> WA1KAT\n> ----- Original Message -----\n> From: \"Clint Bradford\" <[email protected]>\n> To: <[email protected]>; <[email protected]>\n> Sent: Sunday, August 16, 2009 4:19 PM\n> Subject: [amsat-bb] Re: Arrow Antennas\n>\n>\n> > > ... Why are we modifying the Arrow?\n> >\n> > > ... Because someone's analysis says the element length is all wrong\n...\n> >\n> > So Al Lowe's software program which he used to design these is all\nwrong?\n> >\n> > Sorry to get defensive on Al's behalf. This thread just \"feels\" like a\n> re-hash of an \"engineer's view vs. real world results\" argument. Like when\nI\n> was told here - by engineers - that it mattered how I twisted my Arrow\nwhile\n> working the sats. \"Ya gotta take polarization into account, Clint -\nthere's\n> a 22db difference when you turn your antenna 90 degrees - a tremendous\n> performance hit if you don't take this into account ... \"\n> >\n> > Yet in the real world of demonstrating workin' the birds, there's no\nsuch\n> performance degradation. I have hundreds of witnesses to this fact:\nCapture\n> SO-50 and AO-51 with the Arrow and operate TX and RX while twisting the\n> antenna in different angles doesn't change the great reception and\n> transmission quality.\n> >\n> > If you are in the market for an Arrow, I simply suggest that you use it\nas\n> offered to you. You will be pleased with its 2M and 440 amateur bands\n> performance. And leave the modding of the elements w-a-y on the bottom of\n> your \"things to do\" lists.\n> >\n> > Clint Bradford\n> >\n> > ----------------------------------\n> > Clint Bradford, K6LCS\n> > http://www.clintbradford.com\n> > _______________________________________________\n> > Sent via [email protected]. Opinions expressed are those of the author.\n> > Not an AMSAT-NA member? Join now to support the amateur satellite\nprogram!\n> > Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb\n> >\n>\n> _______________________________________________\n> Sent via [email protected]. Opinions expressed are those of the author.\n> Not an AMSAT-NA member? Join now to support the amateur satellite program!\n> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb\n>\n\n\n",
    "attachments": []
}