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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/FBGQ3SVNMI6OBZFGALALFI3QK4X24NQR/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "[email protected]",
    "message_id_hash": "FBGQ3SVNMI6OBZFGALALFI3QK4X24NQR",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/FBGQ3SVNMI6OBZFGALALFI3QK4X24NQR/",
    "sender": {
        "address": "clive (a) g3cwv.co.uk",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "Clive Wallis",
    "subject": "[amsat-bb] Re: G5500 Elevation Rotator Short Circuit?",
    "date": "2011-10-22T12:26:17Z",
    "parent": null,
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Hi Lynn,\n\nMany thanks for your comments.\n\nGood point, although the contacts are normally closed, and open when the \nmotor over-runs. So the usual problem of poor contact wouldn't apply. \nHowever, it's possible that the contacts may have welded together.\n\nI think that to fully protect the motor it needs a controller\nto limit the time that current is supplied to the motor, to a safe \nvalue. A nice little PIC project!\n\nBTW I've recently had a problem with my central heating where a micro \nswitch stuck in the ON position, leaving the boiler firing, when it \nshould have been off. However, this was a normally open contact.\n\n\n73    Clive   G3CWV\n\nHitchin, North Hertfordshire, UK\n\nOn 16/10/2011 13:16, Lynn W. Deffenbaugh (Mr) wrote:\n> I'm not familiar with rotors, actually, but micro switches that aren't\n> switched often (like only when you run the rotor to the stop, which I'm\n> assuming most people try to avoid) kind of limit the effectiveness of\n> \"self-wiping\" or \"self-cleaning\" contacts. I'm just comparing it\n> mentally with my doorbell button that needs a bunch of \"vigorous\n> activations\" (aka pounding on it) periodically to keep function on a\n> \"push once, ring\" basis.\n>\n> So, unless you make a habit of running the rotor to the stops, the\n> switches may not function when/if they ARE needed.\n>\n> Lynn (D) - KJ4ERJ - Author of APRSISCE for Windows Mobile and Win32\n>\n\n",
    "attachments": []
}