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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/UVDWNOYFGLQLVI76FFRYHLI5YM36KEAJ/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "[email protected]",
    "message_id_hash": "UVDWNOYFGLQLVI76FFRYHLI5YM36KEAJ",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/UVDWNOYFGLQLVI76FFRYHLI5YM36KEAJ/",
    "sender": {
        "address": "w9gb (a) icloud.com",
        "mailman_id": "b156075684ac4750b888b2dd14137a40",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/b156075684ac4750b888b2dd14137a40/emails/"
    },
    "sender_name": "Gregory Beat",
    "subject": "Re: [amsat-bb] Channel Master 9521A Rotator interface",
    "date": "2018-06-27T15:21:41Z",
    "parent": null,
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "David -\n\nFor a computer application (HamRadio Deluxe) to have “remote control” of another device ... it requires a communication path (using standards like serial, RS-232 or RS-422, for distance) and an intelligence (u-Processor) within device to interpret the communications and perform desired actions.\n—\nThe Channel Master 9521(A) TV antenna rotator is a simple 50+ year 3-wire motor control design, updated in past decade with “Bling” (7-segment display and IR control) controller using a u-processor, to appear “modern” to non-STEM consumers.\nhttps://support.channelmaster.com/hc/en-us/articles/200382985-Rotator-System-CM-9521A-CM-9521HD-Documents-\n\nIn addition, there is No True BRAKE in these inexpensive designs (reason CDE created the Ham-series of azimuth rotators in 1957)\nThe designs are virtually the same as early 1950s TV rotators in post-WW2 America.\n\nWhy is that an important?\nNO positive feedback between actual direction of outside rotator and inside control box (subject to mis-alignments).\n\nAdding Position Control to 3-wire Rotators (Radio Shack, Channel Master, NTE)\nby Doug Braun, NA1DB (amsat-bb, circa 2001)\nhttp://www.amsat.org/amsat/archive/amsat-bb/200110/msg00027.html\n\nNo schematic diagram provided, BUT YouTube disassemble videos exist.\nhttps://youtu.be/KhvxsMiObTY\n\nBuilding a PIC rotator controller, NA1DB\nhttp://www.dougbraun.com/pix/rotor_controller/index.html\n\ngreg, w9gb\n\nSent from iPad Air\n\n",
    "attachments": []
}