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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/SUMNTEXUXYSV7LKV2TZRC6VC6GVBU2JW/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "[email protected]",
    "message_id_hash": "SUMNTEXUXYSV7LKV2TZRC6VC6GVBU2JW",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/SUMNTEXUXYSV7LKV2TZRC6VC6GVBU2JW/",
    "sender": {
        "address": "K3IO (a) verizon.net",
        "mailman_id": "79a9b3ddaa4b44baae47f92374974ac4",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/79a9b3ddaa4b44baae47f92374974ac4/emails/"
    },
    "sender_name": "Tom Clark, K3IO",
    "subject": "[amsat-bb] Re: Req. help with making a Coax Hybrid",
    "date": "2006-11-17T17:29:35Z",
    "parent": null,
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Jaap -- much of the modern \"TV\" 75 ohm coax these days has a foam\ndielectric (with a Velocity Factor ~ 0.75) instead of the classic RG-59\n(with V.F. ~0.66). If you cut the coax by the standard formulae, this\ncould be the problem.\n\nUsing the coax as a quarter-wave 100 -> 50 ohm transformer is not very\nsensitive. What I do with my MFJ269 is to measure the frequency where an\nopen on the far end looks close to being a short and where a short on\nthe far end looks like an open. You should be able to measure this to ~1\nMHz or better. Even better, do this test with the 3/4 wave piece, where\nyou will get a lever-arm three times longer. I have found that\ncommercial coax varies by 2-3% from lot-to-lot so I always test the coax\neach time I build a new \"rat-race\" hybrid.\n\nHope this helps -- 73, Tom\n\n",
    "attachments": []
}