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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/42AJZSR4RORL67B23XPJEQSHX3XTZ7G5/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "[email protected]",
    "message_id_hash": "42AJZSR4RORL67B23XPJEQSHX3XTZ7G5",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/IOQFJ4BG6Y543E2US4BOCZCEM5BMOXP4/",
    "sender": {
        "address": "cptcurt (a) flash.net",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "Curt Nixon",
    "subject": "[amsat-bb] Re: Question re WA5VJB \"Cheap Yagiis\"",
    "date": "2008-11-15T02:51:26Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/42P523HG5LVGTSTHDND5HK6LUXDCOVIS/",
    "children": [
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/QDN42PKI6C3I5LSP2LD37KUXEK66BAAQ/"
    ],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Thanks James.\n\nYes that is the way I layed them out--using a long rule.  I'm an old \ngage designer so understand cumulative error stackup.\n\nThose are the same differences I have, but when the chart is used for \nthe next two elements for a ten element unit, the spacings just look odd.\n\nI'm going to build it as specified.  It is that way on several pages so \nprobably OK.\n\n\n\nNow I just thave to get a 300.00 antenna analyzer to figure out if the \nmatch is good on the $10.00 antenna!! ;)\n\nCurt\n\n\nJames Duffey wrote:\n> Curt - I have built lots of there. I use the 1/2 inch as the inside \n> dimension.\n>\n> It is best to measure the spacing as cumulative from the rear, not \n> incremental. That eliminates cumulative errors. ANd you don't have to \n> subtract. Use a tape measure, or you can buy a 5 or 6 ft steel rule \n> pretty cheaply at Lowes or HOme Depot.\n>\n> Here is the referencce I use for LEO antennas:\n>\n> < http://www.wa5vjb.com/references/Cheap%20Antennas-LEOs.pdf >\n>\n> Here is what I get for the spacings when I subtract: 5.75, 6.25, 6.5, \n> 6.5, 7.25. I think that this is reasonable.\n>\n> But don't subtract measure it all from a single reference point, the \n> reflector. The antennas work great. - Duffey\n> On Nov 14, 2008, at 11:47 AM, Curt Nixon wrote:\n>\n>> Good afternoon:\n>>\n>> Hi have liked the way the WA5VJB Kent Britain 144Mhz cheap yagi worked\n>> so decided to build one for 435.\n>>\n>> Couple of questions:\n>>\n>> For the driven element \"hairpin\" or J, it shows 1/2\" dimension for the\n>> spacing--knowing this might be critical on 435, is that INSIDE spacing\n>> or OUTSIDE spacing??\n>>\n>> Also, I noticed what appears to be unusual element spacing for the last\n>> directors in both the 435 and 432 versions.  The spacing increments seem\n>> to follow an increasing spacing trend but then the last couple are\n>> different.  ie  spacing goes ...6.25, 6.5, 6.5, 7.25, 7.25, 7.0, then \n>> 7.5.\n>>\n>> Is this a result of the computer design for easily progressive build, or\n>> perhaps some error in the dimensions posted on-line??\n>>\n>> Thanks,\n>>\n>> Curt\n>>\n>> KU8L\n>>\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 \n>> program!\n>> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb\n>\n> -- \n> KK6MC\n> James Duffey\n> Cedar Crest NM\n>\n>\n>\n>\n>\n>\n\n",
    "attachments": []
}