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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/ONFNTGKRPBOKXDBWQSMZS4VWCRSXMSHW/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "ONFNTGKRPBOKXDBWQSMZS4VWCRSXMSHW",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/VORDXUAQMKXQGXHYOVL7HHTD5ES2ZMWK/?format=api",
    "sender": {
        "address": "jonny290 (a) gmail.com",
        "mailman_id": "bed0432ae6e64c0493fa6343553c3746",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/bed0432ae6e64c0493fa6343553c3746/emails/?format=api"
    },
    "sender_name": "jonny 290",
    "subject": "[amsat-bb] Re: 435 offset yagi phasing",
    "date": "2007-12-29T01:28:40Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/ITWIAZ73Y44L56Y6PGONITLEL3KOAGGD/?format=api",
    "children": [
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/L7TIGGOYQQEZS34AN2GO5VXZPQNFKJFK/?format=api"
    ],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "The 1/4 wave sections transform the 50 ohm antenna impedances to 100 \nohms at the end of the 75 ohm matching section. If you then use a tee to \nparallel the two antennas, the impedance follows the same rules as \nparalleled resistances, which means you have a 50 ohm  system at the tee.\n\nYou can do it another way, too - just tee the 50 ohm lines and off the \ntee run a 1/4 wave section of 37 ohm cable, made with two runs of 75 ohm \ncoax in parallel. This transforms the 25 ohm impedance at the tee back \nup to 50 ohms at the end of the matching section.\n\nI don't know which is superior - you have your options, though.\n\n\nAndrew Rich wrote:\n> Ok I have to ask the question.\n>\n> With offset yagis, those antennae that introduce circular polarisation by\n> means of offsetting the second yagi 90 degress,\n> why would you cut your coax to a 1/4 wave length ?\n>\n> You already have 90 degrees from the displacement of the yagis.\n>\n> It should not matter what length the 75 ohm coax is ?\n>\n> Would it not ?\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": []
}