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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/OU33TGKGAL6PYSSCCRHIEFQISG47VRZ3/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "4AE47A801F40435686ACBC63B3038862@officesatcomp",
    "message_id_hash": "OU33TGKGAL6PYSSCCRHIEFQISG47VRZ3",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/J6XBZ7JX2HMFLSH6CGHYKRE5GJYSKXVZ/",
    "sender": {
        "address": "hkowall (a) shaw.ca",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "Howard Kowall",
    "subject": "[amsat-bb] Re: Cushcraft 416-TB",
    "date": "2011-03-23T14:02:45Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/JT3LSRQKZGZPH37TGUYEAOIZTKTJW4KQ/",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Hello David\nI did think about that also\nI also though maybe the balun didn't make it 50 ohms but maybe a much high value\nBut when i fed the ver driven element with  50ohm feed line and checked the swr with just a meter it was ok so that ruled that out.\nI realize the circular porization was done by the physical location of the driven elements,\nThanks very much David\nHoward\n\n\n  ----- Original Message ----- \n  From: David Greenberg \n  To: Howard Kowall ; AMSAT BB \n  Sent: Wednesday, March 23, 2011 8:50 AM\n  Subject: Re: [amsat-bb] Cushcraft 416-TB\n\n\n  Hello Howard,\n\n  From the cable length that you measure it looks like 3/4 Lambda instead of 1/4 Lambda which is too short for convenience working. From the electrical point of view it is the same, assuming low loss coax.\n\n  David 4X1DG\n    ----- Original Message ----- \n    From: Howard Kowall \n    To: AMSAT BB \n    Sent: Wednesday, March 23, 2011 3:28 PM\n    Subject: [amsat-bb] Cushcraft 416-TB\n\n\n    Hello All\n    I acquired a Cushcraft 416-Tb antenna,the so called phasing harness was in bad shape,so I am going to make a new one for it.\n    I could copy the original one,but yes I am making it hard on myself and decide to calculate the proper cable type and length,and to do that I need to know how the antenna actually works.Here is my problem ,the 2 driven elements have a balun to each of the Tmatchs to make the impedance 50 ohms on each driven element.The original phasing harness is 2 piece of 75 ohm aprox 13\" that goes to each driven element and the a so239 connector on the other end of the harness is the 50 ohm feedline.I originally thought this was a matching stub,but when I do the calculation for the matching stub,should only be aprox 4\" to each driven element.Am I missing something here,how are they able to do this,does anyone know this antenna and how it works.\n    Thanks to all who read and respond in advance\n    Howard VE4ISP\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 program!\n    Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb\n",
    "attachments": []
}