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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/NL3TAYONT4AECSGB4EUG5IHEOVWLTEQY/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "[email protected]",
    "message_id_hash": "NL3TAYONT4AECSGB4EUG5IHEOVWLTEQY",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/OWR2ETNXXNOY2TR7OCE57YWLWCXAS4QK/",
    "sender": {
        "address": "JamesDuffey (a) comcast.net",
        "mailman_id": "16d2718d7d4a47dca8f564d867aacfe2",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/16d2718d7d4a47dca8f564d867aacfe2/emails/"
    },
    "sender_name": "James Duffey",
    "subject": "[amsat-bb] Re: EZ-lindenblad info",
    "date": "2008-12-04T01:28:12Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/ERGN6FK7XZZWIA4XAYGAK3SWOO2ISOJK/",
    "children": [
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/FE4L4HDIIM3PBNAWVUTQNEYOAUQVFOAT/"
    ],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Tim - What you need to do is calculate the reactance of the elements  \nwith the diameter of the specified elements. Then calculate the length  \nof the element with the new diameter so that the reactance of the new  \nelement is the same as the old one. I think that the corrections may  \nnot be significant if the diameters are not too far apart.\n\nL. B. Cebik wrote how to do this in his web page on scaling Yagis form  \none frequency to another. I wrote a spreadsheet to calculate these  \nlengths for Yagis, mostly to go from 432 MHz to 144 MHz. You could use  \nthat with the appropriate diameters I think. If I can find it I can  \nsend it to you.\n\nThe calculations are straight forward, but the equations are not  \nshort. It can be done though and will be reasonably accurate as long  \nas your diameters are similar. - Duffey\nOn Dec 3, 2008, at 1:20 PM, Tim Tuck wrote:\n\n> Nigel Gunn G8IFF/W8IFF wrote:\n>> What's the difference between a metric version and any other version.\n>> Just multiply the inches by 25.4 and it will be metric.\n>>\n> While it would be nice if it was that easy the problem arises when\n> trying to buy aluminium in those odd sizes. i.e. 1/4inch is 6.45mm.\n> Local aluminium suppliers don't have imperial sizes so I'm stuck with\n> 5mm, 10mm, 15mm etc. thus the math needs redoing for the different  \n> sizes\n> and I was wondering if anyone had done that before I attempt it. :)\n>\n> regards\n>\n> Tim\n>\n>\n> -- \n>\n> VK2XTT :: QF56if :: BMARC :: WIA :: AMSAT-VK :: AMSAT\n>\n> _______________________________________________\n> Sent via [email protected]. Opinions expressed are those of the  \n> author.\n> Not an AMSAT-NA member? Join now to support the amateur satellite  \n> program!\n> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb\n\n--\nKK6MC\nJames Duffey\nCedar Crest NM\n\n\n\n\n\n",
    "attachments": []
}