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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/AIAR4R3NXLJ56Q6YRLALNWNAY7CFTDRM/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "AIAR4R3NXLJ56Q6YRLALNWNAY7CFTDRM",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/475YBSUFA76RJJ5RDXFRJVRF5FNF5DMH/?format=api",
    "sender": {
        "address": "updwrb (a) bristor-assoc.com",
        "mailman_id": "6a38e6f613ad494f85758faeecec9d50",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/6a38e6f613ad494f85758faeecec9d50/emails/?format=api"
    },
    "sender_name": "w4upd",
    "subject": "Re: [amsat-bb] Mirage KP-2 2 meter preamp help",
    "date": "2016-02-16T02:35:48Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/475YBSUFA76RJJ5RDXFRJVRF5FNF5DMH/?format=api",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "There are town versions of this preamp. The first and older version is \nmounted in a cast aluminum box which provides rf shielding. The newer \nversion is mounted in a plastic box with stainless steel angle bracket. \nEach are slightly different in the components.\n\nReid, W4UPD\n\n\nOn 2/15/2016 7:17 PM, Larry Ryan wrote:\n> I am trying to repair a Mirage KP-2 series mast-mount 2M preamp. It is\n> quite old. Also, I have the companion bias-tee or Control Box as Mirage\n> calls it. Also, I have the 70CM Mirage preamp which works really well.\n>\n> I have contacted MFJ for info and they are very agreeable and they \"need to\n> check one part numbers, etc.\" but never return a call. When I call them\n> back, I get the same very polite and agreeable \"need to check....\".  I have\n> done this 3 times without getting any info from them.\n>\n> The problem is not in the Control Box - they both work well with the\n> working KP-2 70CM preamp.\n>\n> Have any of you repaired a KP-2 2M preamp?\n>\n> Do any of you have a schematic diagram of this preamp?\n>\n> Do any of you know the part number of the gasfet transistor? (I'm thinking\n> its the problem)\n>\n> Details:  I have cleaned up and tested the preamp. It seems that the\n> internal bias-tee relay is working properly and there are voltages on the\n> transistors that seem to match the working KP-2 70CM preamp. The preamps\n> were mounted on my M2 circularly polarized arrays at a previous QTH.\n> Presently, I'm setting up two much smaller antennas and I want to use these\n> preamps. I'm reasonably sure its the gasfet transistor. I Googled this\n> topic extensively and I find other hams asking this same question without\n> an answer in postings from 2001 to 2012. No schematic and no part number\n> for the gasfet. At $200 each, I want to try to repair it.\n>\n> Any help would be appreciated.\n>\n> Thanks & 73, Larry W7DGP\n> _______________________________________________\n> Sent via [email protected]. AMSAT-NA makes this open forum available\n> to all interested persons worldwide without requiring membership. Opinions expressed\n> are solely those of the author, and do not reflect the official views of AMSAT-NA.\n> Not an AMSAT-NA member? Join now to support the amateur satellite program!\n> Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb\n>\n\n",
    "attachments": []
}