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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/VORDXUAQMKXQGXHYOVL7HHTD5ES2ZMWK/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "VORDXUAQMKXQGXHYOVL7HHTD5ES2ZMWK",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/VORDXUAQMKXQGXHYOVL7HHTD5ES2ZMWK/?format=api",
    "sender": {
        "address": "vk4tec (a) people.net.au",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "Andrew Rich",
    "subject": "[amsat-bb]  435 offset yagi phasing",
    "date": "2007-12-28T11:25:06Z",
    "parent": null,
    "children": [
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/O6WPHOTVPPISUMOFWOPGRFRBFHWVWILD/?format=api",
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/I7EYM2BQFF2HSF3QEKLCKSXJXKMVPOXV/?format=api",
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/MBJ33AWHTAVVAUY5VC4XTVLEXLDFG35F/?format=api"
    ],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Hi\n\nI have had good success with just one yagi of an offset crossed array I am\nbuilding.\n\nhttp://wa5vjb.com/yagi-pdf/cheapyagi.pdf\n\nI will add the other elements shortly.\n\nI am not ready to tackle the phasing part.\n\nI hope I have this right.\n\n1. The yagi's are offset, by 90 degrees so that is the offset already.\n2. Both yagis's should then have the same length of coax coming from each\none.\n3. Both yagi's will require a 1/4 wavelength of 75 ohm coax for each feed.\n4. Remebering that the velocity factor is 2/3 in coax cable, or the speed of\nlight 200 instead of 300.\n5. Both 75 ohm feeds then join at a tee, the result of the 50 ohm antenna\nand 70 ohm feed giving around 120 ohm\n6. By tee'ing the two together, this should present around 50 ohm, required\nfor the main feedline.\n\nDoes that sound right ?\n\n( 200/435 MHz ) /4 = 11.49 cm for each feed to the tee junction of 75 ohm\ncable.\n\n\n----------------------------------------------------------------------------\nAndrew Rich VK4TEC\n",
    "attachments": []
}