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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/ZW7XLFNIER64CPW6NNJJJXSLGZ7LZ4YT/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "[email protected]",
    "message_id_hash": "ZW7XLFNIER64CPW6NNJJJXSLGZ7LZ4YT",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/PG7KLWB3BRM63WYM6OK4354P5JNFP2YY/",
    "sender": {
        "address": "k6vug (a) sbcglobal.net",
        "mailman_id": "37fd9aee884c4835a5c51104b6295d3a",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/37fd9aee884c4835a5c51104b6295d3a/emails/"
    },
    "sender_name": "[email protected]",
    "subject": "Re: [amsat-bb] Arrow modification",
    "date": "2019-01-02T23:20:31Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/BDH4YGRWRV7EKODR7SUV25PK7JZ52XPO/",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "When the VHF and UHF are collinear and in the same electric plane, with the UHF array in front of the VHF array, the interference is hardly noticeable as long as the lower frequency is NOT transmitting.  So, it works very well for sats that have UHF uplink and VHF downlink. However, experience has shown that a VHF uplink severely affects the UHF downlink. \n\nHaving them at 90 degrees to each other on the same boom is a real-world compromise - see beginner's article in AMSAT journals. \nKeeping them at least 1/2 wavelength side by side apart (like a H or U) works quite well for both V/U and U/V modes. \n\nHaving tried several arrangements, I have settled on the side by side arrangement with shorter arrays - it minimizes interference, helps reduce overall weight, while providing sufficient gain. Also dismantles quickly for easy carry.  \n\n\n73!Umesh, k6vug\n\n\n\n\n\n\n\n    On Wednesday, January 2, 2019, 12:50:14 PM PST, Douglas B Tabor via AMSAT-BB <[email protected]> wrote:  \n \n Many thanks to all for the information and observations. \nMuch appreciated and will give me something to chew on for a bit.\n\nThis is a great community that we have at AMSAT-BB.\n\n73 and HNY,\n\nDoug, N6UA\n_______________________________________________\nSent via [email protected]. AMSAT-NA makes this open forum available\nto all interested persons worldwide without requiring membership. Opinions expressed\nare solely those of the author, and do not reflect the official views of AMSAT-NA.\nNot an AMSAT-NA member? Join now to support the amateur satellite program!\nSubscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb\n  \n",
    "attachments": []
}