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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/7S7ONZTXUYAQH5IHZHL5RX57AAYXV3GJ/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "7S7ONZTXUYAQH5IHZHL5RX57AAYXV3GJ",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/7S7ONZTXUYAQH5IHZHL5RX57AAYXV3GJ/?format=api",
    "sender": {
        "address": "carl (a) esteys.net",
        "mailman_id": "d5f8be782369462485784fe84d25bdad",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/d5f8be782369462485784fe84d25bdad/emails/?format=api"
    },
    "sender_name": "Carl A Estey",
    "subject": "[amsat-bb] Tuning M2 LEO pack antennas",
    "date": "2020-04-20T17:19:03Z",
    "parent": null,
    "children": [
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/6CSOT4OIXUKUBGRHUOKQGWC2IT7B6YFU/?format=api"
    ],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Recently I bought through AMSAT the LEO pack and assembled and installed it this weekend. The SWR on the 2-meter antenna is 1.4:1 from 144.1 to 146.1 with resistance of 58 ohms and 2.5:1 at 148 MHz.  The 70-cm antenna has the best SWR (3.0:1 and resistance of 25 ohms) at 442.6 MHZ.   Obviously neither is great.\n\nHow should I tune the antennas?  It appears that the only tuning possible is to adjust the shorting straps for distance from the inside edge of the shorting bar to there boom.  ShouldI I be able to achieve 1.1:1 on both antennas?  How should the coax be routed from the junction block?  I have the LMR-400 feedline zip tied along the boom to the cross bar and then around the rotors.  \n\nWhat suggestions do you have?\n\nThe instructions particularly concerning the location of the 1/4-wave phasing line and the 1/2 wave balun were not very clear.  Does anyone  have any pictures or illustrations that show placement of the tasing line and balun?\n\n73\nCarl WA0CQG  \n\n",
    "attachments": []
}