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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/VULMJ6P2VR4ENOFOLNOL4HXUADL463AS/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "[email protected]",
    "message_id_hash": "VULMJ6P2VR4ENOFOLNOL4HXUADL463AS",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/GAYHTTKXIWZ5NXX6VZKPA34LIDODDQ3C/",
    "sender": {
        "address": "ham (a) g4dmf.co.uk",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "John Wright",
    "subject": "[amsat-bb] Re: FT-847 Disaster - THE PAIN!",
    "date": "2007-12-28T11:38:00Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/PKI4UQW73XDRP2TPM25C5OGADN3X3VIW/",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "\n>\n>\n>[snip]\n>\n> > In the commercial world of radio's (R/T) the Tait/Motorola/etc rigs have\n> > all sorts of \"idiot proofing\" built in....the most useful ones being\n> > FAST blow fuses or circuit breakers combined with a very large (>100\n> > amp) suicide diode in the main power leads to remove power really,\n> > really fast in the event of a major problem.\n> >\n>\n>Just remember, as soon as you make something \"idiot-proof\", nature will\n>invent a better idiot...\n\nA fuse and sacrificial diode are all very well, BUT.. Fuses take time \nto rupture, and a power transisistor always has, and always will be \nthe fastest fuse on 3 legs... or 4 or whatever.\nFor higher power items, I prefer the Idiot-Proofing method of a big \nrelay!... Car accessory type of thing, in series with the input line, \nand the coil energized with a smaller diode!.. Wrong polarity, no \ncoil current, so no power to item. It also has a zero volt-drop \nadvantage. Smaller items are catered for with a SERIES diode, the \n0.7V volt drop rarely has any effect on smaller items, as they tend \nto be internally regulated to lower voltages anyway. \n\n",
    "attachments": []
}