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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/KWVODCM7Y7ROW5F3XBZCNNF6WWWCRXLE/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "[email protected]",
    "message_id_hash": "KWVODCM7Y7ROW5F3XBZCNNF6WWWCRXLE",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/KWVODCM7Y7ROW5F3XBZCNNF6WWWCRXLE/",
    "sender": {
        "address": "list1 (a) g3cwv.co.uk",
        "mailman_id": "cca7806f93be48f594afa372ace7ea2e",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/cca7806f93be48f594afa372ace7ea2e/emails/"
    },
    "sender_name": "Clive Wallis",
    "subject": "[amsat-bb] Re: G5500 Elevation Rotator Short Circuit?",
    "date": "2011-10-09T16:50:48Z",
    "parent": null,
    "children": [
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/7EVNH4GELZ7AINYK36J3XWGGGOVVHFB2/"
    ],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Many thanks Tim for your comments.  From what you've said it sounds like \na faulty motor.  In the ones you've repaired have you been able to \ndetermine the cause of motor over heating?\n\nThe problems I've had in the past have always been due to water getting \ninto the units.\n\n73    Clive    G3CWV\n\nHitchin, North Hertfordshire, UK\n\nOn 07/10/2011 18:50, Tim Cunningham wrote:\n> The common failure of the motor windings is caused by heat which\n> causes the enamel coated wire to breakdown. When the enamel breaks\n> down an inner winding short results.\n>\n> I have successfully rewound motor windings on these rotators just to\n> say it could be done, but it takes some work (not recommended).\n>\n> I have never seen one of these motors with an open winding. The\n> failure mode on the 8 that I have repaired were always enamel\n> insulation breakdown as a result of overheating.\n>\n>\n> Tim - N8DEU\n>\n>\n> Sent from my HTC Tilt™ 2, a Windows® Mobile phone\n>\n> -----Original Message----- From: Clive Wallis<[email protected]>\n> Sent: Friday, October 07, 2011 11:35 AM To:\n> amsat<[email protected]> Subject: [amsat-bb] G5500 Elevation Rotator\n> Short Circuit?\n>\n> I wonder if this is a known fault.  Recently the fuse on my G5500\n> blew.   The problem seems to be a short on one of the motor\n> circuits.\n>\n> Checking the DC resistance at the control end, the resistance of one\n> winding is 1.2 ohms, whereas all the other windings are 4.6 ohms.\n>\n> I could understand a motor burning out and going open circuit,  but\n> a short circuit seems less likely.  I'm wondering if it could be a\n> short on the cable at the rotator end, where it is subject to much\n> bending. There's about 15 metres of cable.\n>\n> Any thoughts would be much appreciated.  Unfortunately, at the\n> present time I'm not able to inspect the rotator.  It's stuck in the\n> horizontal position, so I will still be able to use the antenna for\n> low elevation passes.\n>\n> 73     Clive     G3CWV\n>\n> Hitchin, North Hertfordshire, UK\n> _______________________________________________ Sent via\n> [email protected]. Opinions expressed are those of the author. Not\n> an AMSAT-NA member? Join now to support the amateur satellite\n> program! Subscription settings:\n> http://amsat.org/mailman/listinfo/amsat-bb\n>\n>\n> _______________________________________________ Sent via\n> [email protected]. Opinions expressed are those of the author. Not\n> an AMSAT-NA member? Join now to support the amateur satellite\n> program! Subscription settings:\n> http://amsat.org/mailman/listinfo/amsat-bb\n>\n\n",
    "attachments": []
}