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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/5VCASEYYAVDEAEW33DDFYV32BZNHRJF6/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "CAEahN0Kn-B1js+4YdmaT543TMr3Vp8Z_2ZrqB0e91gBPJDv4rA@mail.gmail.com",
    "message_id_hash": "5VCASEYYAVDEAEW33DDFYV32BZNHRJF6",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/PIYVWP64G534UX5AMFTFCKYY347WOQXU/",
    "sender": {
        "address": "ai7rogerroger (a) gmail.com",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "Roger",
    "subject": "Re: [amsat-bb] Insulated AWG to bare copper or aluminum",
    "date": "2016-10-13T22:15:53Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/RT2RRSILLG5YCE7KU527DIB7FVLPLOTD/",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Oops. My bad. James, not Bob.\n\n\n73, Roger\nW7TZ\nCN83ia\n\nOn Thu, Oct 13, 2016 at 3:12 PM, Roger <[email protected]> wrote:\n\n> Bob, you're going to get a wide variety of answers to your question and\n> for good reason. All insulation is not created equal and therefore will\n> have varying effects on your project. I'm not aware of a simple formula\n> either but could possibly assist in your efforts. It sounds like you want\n> to use 10awg Romex. In this case, I'd strip the insulation from the copper,\n> secure one end of the copper in a vice or similar device, put the far end\n> in a variable speed drill and gently twist the copper wire to create\n> stiffer material. What yagi design do you have in mind? How many elements?\n> What type of feed? How high do you intend to mount the antenna? These\n> things all need to be taken into consideration for efficiency.\n>\n>\n> 73, Roger\n> W7TZ\n> CN83ia\n>\n> On Thu, Oct 13, 2016 at 2:41 PM, Bob <[email protected]> wrote:\n>\n>> The best I can do for you comes from the documentation for antenna\n>> modeling\n>> software which does cover the impact of the element diameter.  The impact\n>> on the driven reflector is almost zero.  The impact on the directors is\n>> not\n>> quite zero.\n>>\n>> Doubling the diameter of the element, example going from 12.5mm to 25mm\n>> (1/2\" to 1\") will cause the driven element to SHORTEN by 5mm (that's about\n>> 0.2 inches).  In other words, you can pretty much forget it.  The impact\n>> on\n>> the directors is larger, SHORTENING it about 25mm, or an inch.  But even\n>> so, these dimensional changes are FAR less significant that the changes\n>> due\n>> to height, ground characteristics, and what else is near the antenna.  In\n>> other words you can forget about factoring it in.\n>>\n>> Same thing is pretty much true for insulated vs. non-insulated wire -- you\n>> can pretty much forget about it.\n>>\n>> Good luck!\n>>\n>> 73, Bob, WB4SON\n>>\n>>\n>> On Thu, Oct 13, 2016 at 5:15 PM, James Hickox <[email protected]>\n>> wrote:\n>>\n>> >  Hello All, I am wondering if there is any \"simple\" conversion factor to\n>> > use to modify the length of an antenna element from insulated #10 AWG\n>> > copper wire to anther gage of wire or to aluminum or copper tubing.  I\n>> > don't wish to learn any modeling software at this time   I need the\n>> > information so I can use materials I have on hand to build yagi antennas\n>> > for 2 meters and 70 centimeters.\n>> >   Thanks and 73,James, AA5AO\n>> > _______________________________________________\n>> > Sent via [email protected]. AMSAT-NA makes this open forum available\n>> > to all interested persons worldwide without requiring membership.\n>> Opinions\n>> > expressed\n>> > are solely those of the author, and do not reflect the official views of\n>> > AMSAT-NA.\n>> > Not an AMSAT-NA member? Join now to support the amateur satellite\n>> program!\n>> > Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb\n>> >\n>> _______________________________________________\n>> Sent via [email protected]. AMSAT-NA makes this open forum available\n>> to all interested persons worldwide without requiring membership.\n>> Opinions expressed\n>> are solely those of the author, and do not reflect the official views of\n>> AMSAT-NA.\n>> Not an AMSAT-NA member? Join now to support the amateur satellite program!\n>> Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb\n>>\n>\n>\n",
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}