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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/B56O74RO64JLSDWRVOJAAVJMUDU3YLON/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "B56O74RO64JLSDWRVOJAAVJMUDU3YLON",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/B56O74RO64JLSDWRVOJAAVJMUDU3YLON/?format=api",
    "sender": {
        "address": "hans.bx2abt (a) msa.hinet.net",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "Hans BX2ABT",
    "subject": "[amsat-bb] KR-400 transformer wiring",
    "date": "2018-10-21T13:12:26Z",
    "parent": null,
    "children": [
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/4A5YURUNTBHLTRZYEITTTKJM6MOIR26M/?format=api"
    ],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "I got this old KR-400 azimuth rotor as a gift, but is wired for 220V and \nI need to run it off of 110V. The transformer's wiring now looks like this:\n\n\n      |  220V  |\n      |        |\n|~~~~|~~~~|   |~~~~|~~~~|\n5    1    3   6    2    4\n|                  |\n|__________________|\n\n\nIf the drawing is messed up, here is the gist of it: The primary \nconsists of two (parallel/separate) windings, one with odd, one with \neven numbering (3-5 and 4-6) with the center of the winding named 1 and \n2. Currently 2 and 5 are shorted and 220V comes in at 1 and 6. So \ncurrent flows from 1 to 5 to 2 to 6 and vice versa.\n\nTo rewire to 110V I guess I just use any of the combination 1-3, 1-5, \n2-4 or 2-6. But I am just curious why the 220V wiring was done over two \ncoils, not one? Was this factory standard or has my unit been modified \nwith a different transformer?\n\nOnce I get the control unit powered up it time to test the rotator and \nsee if it needs any maintenance (probably will, because it hasn't been \nused for a long while).\n\n",
    "attachments": []
}