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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/EUSAAC6OUK6ODY4TXKMT3WJJEANDDWIF/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "[email protected]",
    "message_id_hash": "EUSAAC6OUK6ODY4TXKMT3WJJEANDDWIF",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/EUSAAC6OUK6ODY4TXKMT3WJJEANDDWIF/",
    "sender": {
        "address": "7ndel3fr (a) gmail.com",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "Calvin McDonald",
    "subject": "[AMSAT-BB] Re: Cross Polarized Yagi: X or +",
    "date": "2023-09-10T23:19:24Z",
    "parent": null,
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "I was under the impression that it didn't matter how that antenna was \noriented (it circular) and that a conductive mast shouldn't be used.\n\n From the manual for the M2 circular polarized 70cm yagi:\n\n“The 436CP30 is a circular polarized antenna and creates a field in all \nplanes or polarities. Performance DETERIORATES SIGNIFICANTLY if it is \nmounted on a metal (conductive) mast or cross boom. A mast or cross boom \nof any NON-CONDUCTIVE material must be used. Fiberglass is the prime \nchoice for its strength and weather resistance. Mount the 436CP30 so \nthat element tips are at least 12” from any conductive material (mast, \ntower, feed line, etc.).”\n\nCal - N7AY\n\n\nOn 9/10/2023 4:39 PM, Gary via AMSAT-BB wrote:\n>\n> It will allow you to use a conductive crossboom, and/or route your \n> feedline back out of the antennas along the crossboom. Antenna guru \n> Kent Britain, wa5vjb studied and tested this. He wrote a paper on it \n> and published it as part of an AMSAT symposium. You can see the paper \n> here:\n>\n> Using Metal Cross Booms w/ Satellite Antennas (kk0sd.net) \n> <http://www.kk0sd.net/metalboom/metalboom.htm>\n>\n> 73,\n>\n> Joe kk0sd\n>\n> *From:* K4IDC via AMSAT-BB <[email protected]>\n> *Sent:* Sunday, September 10, 2023 4:54 PM\n> *To:* AMSAT-BB <[email protected]>\n> *Subject:* [AMSAT-BB] Cross Polarized Yagi: X or +\n>\n> I'm new to this mode..\n>\n> I was advised by someone I think is knowledgeable, and certainly more \n> so than me, to orient my cross polarized 2m Yagi so that the elements \n> resemble an X rather than a +. Easily enough done...what's the advantage?\n>\n> It's my understanding that the two sets of elements are out of phase \n> by 90° & combined at the common feed point to emulate circular \n> polarization. How does the rotation along the boom axis make a difference?\n>\n> Seeking understanding...\n>\n> Thanks,\n>\n> Robin Midgett K4IDC\n>\n>\n> -----------------------------------------------------------\n>\n> Sent via AMSAT-BB(a)amsat.org. AMSAT-NA makes this open forum available\n> to all interested persons worldwide without requiring membership. Opinions expressed\n> are solely those of the author, and do not reflect the official views of AMSAT-NA.\n> Acceptable Use and Privacy Policies available athttps://www.amsat.org/about-amsat/\n>\n> View archives of this mailing list at\n> https://mailman.amsat.org/hyperkitty/list/[email protected]\n> To unsubscribe send an email to amsat-bb-leave(a)amsat.org\n> Manage all of your AMSAT-NA mailing list preferences athttps://mailman.amsat.org\n\n\n",
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