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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/GSY63W6H4WTW256BPQ3J6FGG6TMAUZEQ/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "004b01c904de$dab81e00$0200a8c0@kc6uqh",
    "message_id_hash": "GSY63W6H4WTW256BPQ3J6FGG6TMAUZEQ",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/WUIIBA2TD7I4LCFXRDZALRG2WARAPPL6/?format=api",
    "sender": {
        "address": "kc6uqh (a) cox.net",
        "mailman_id": "d9201820d18047e4a2772c86bda5e111",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/d9201820d18047e4a2772c86bda5e111/emails/?format=api"
    },
    "sender_name": "Art McBride",
    "subject": "[amsat-bb] Re: Determining the length of a driven element",
    "date": "2008-08-23T05:12:35Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/WUIIBA2TD7I4LCFXRDZALRG2WARAPPL6/?format=api",
    "children": [
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/WKN52DSWNCXXKOCXFHA7YMDWHOICZRYL/?format=api"
    ],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Phil,\nSWR should be less than 2:1 Several computer modeling programs exist that\nwill give you and answer to your question. Length is the resonant part of\nthe SWR, resistance is the other part, either can cause a high VSWR and\nusually both contribute. \n\nArt,\nKC6UQH\n-----Original Message-----\nFrom: [email protected] [mailto:[email protected]] On\nBehalf Of Phil\nSent: Friday, August 22, 2008 8:18 PM\nTo: [email protected]\nSubject: [amsat-bb] Determining the length of a driven element\n\nHello,\n\nDuring a casual conversation recently, the topic of aerial trimming came up.\n\nPerhaps this may be a little off-topic here but since I don't know the\nanswer \nI thought this would be a good place to ask anyway.\n\nSay a dipole has an SWR of 5:1 at one end of a band and 4:1 at the other\nend. \nFurther, let's say that the dipole will be used at the centre of the band\nand \nwith a reasonable SWR. It has been determined that the dipole needs to be \nshortened. The question is by how much?\n\nThe person asking the question is reluctant to pull the aerial down a dozen \ntimes so that short lengths can be nibbled off each end and instead wants to\n\nknow if the amount that needs to be cut off can be determined from the \ndifference in the SWR at both ends of the band.\n\nA logical question I suppose but is there a reasonable answer?\n\n-- \nRegards,\nPhil\n_______________________________________________\nSent via [email protected]. Opinions expressed are those of the author.\nNot an AMSAT-NA member? Join now to support the amateur satellite program!\nSubscription settings: http://amsat.org/mailman/listinfo/amsat-bb\n\n__________ Information from ESET NOD32 Antivirus, version of virus signature\ndatabase 3381 (20080822) __________\n\nThe message was checked by ESET NOD32 Antivirus.\n\nhttp://www.eset.com\n\n \n\n__________ Information from ESET NOD32 Antivirus, version of virus signature\ndatabase 3381 (20080822) __________\n\nThe message was checked by ESET NOD32 Antivirus.\n\nhttp://www.eset.com\n \n\n",
    "attachments": []
}