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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/BGKFSF6V2R4XBECIQ7O4ZWZREC5WQCDN/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "001801c84cb3$fd0f1460$0200a8c0@kc6uqh",
    "message_id_hash": "BGKFSF6V2R4XBECIQ7O4ZWZREC5WQCDN",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/IWCP55GXC35HB6OHFUZHSYIN2P5UXAP6/?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": "kc6uqh",
    "subject": "[amsat-bb] Re: 70cm Yagi and AO-51",
    "date": "2008-01-01T20:22:10Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/3FLCUTUPVZBJMEIY3HVMEQYLNGFTRSAB/?format=api",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Andrew,\nTheoretical circular  to linear loss is 3dB either LH or RH vs any angle of \nlinear polarization. A linear polarized antenna rotated in the field of a \ncircular polarized wave will show no change with rotation.\nThe amount of variance that is measured on circular antennas comes from the \npattern of the circular antenna being elliptical and not circular. This is \nrefered to as the axial ratio and in practice anything less than a 3 dB \nvarance is considered good. A standard helix antenna is typically 4-5 dB. \nThis is a +/- value in addition to the 3 dB loss for cir to lin conversion.\n\nArt\nKC6UQH\n----- Original Message ----- \nFrom: \"Andrew Rich\" <[email protected]>\nTo: \"OZ1MY\" <[email protected]>; \"Amsat-Bb@Amsat. Org\" <[email protected]>\nSent: Tuesday, January 01, 2008 7:54 AM\nSubject: [amsat-bb] Re: 70cm Yagi and AO-51\n\n\n> If I have this correct.\n>\n> 1. LHCP recieved on a RHCP can knock your signal down by some 20dB\n> 2. LHCP matched with LHCP will result in a good signal.\n>\n> So how does a linear antenna equate when receiving a circular signal ?\n>\n> And the other way around, a circular receiving a linear signal ?\n>\n>\n>\n>\n> ----------------------------------------------------------------------------\n> Andrew Rich VK4TEC\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",
    "attachments": []
}