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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/475YBSUFA76RJJ5RDXFRJVRF5FNF5DMH/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "CAK9b=dgHsvvcRxxeeiv8xiszrTqQ7JPWR0D8eic42MzySKyAag@mail.gmail.com",
    "message_id_hash": "475YBSUFA76RJJ5RDXFRJVRF5FNF5DMH",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/475YBSUFA76RJJ5RDXFRJVRF5FNF5DMH/",
    "sender": {
        "address": "llryan807 (a) gmail.com",
        "mailman_id": "0a7d27f4ae6f453bbac45c8f738a4e86",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/0a7d27f4ae6f453bbac45c8f738a4e86/emails/"
    },
    "sender_name": "Larry Ryan",
    "subject": "[amsat-bb] Mirage KP-2 2 meter preamp help",
    "date": "2016-02-16T00:17:11Z",
    "parent": null,
    "children": [
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/AIAR4R3NXLJ56Q6YRLALNWNAY7CFTDRM/"
    ],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "I am trying to repair a Mirage KP-2 series mast-mount 2M preamp. It is\nquite old. Also, I have the companion bias-tee or Control Box as Mirage\ncalls it. Also, I have the 70CM Mirage preamp which works really well.\n\nI have contacted MFJ for info and they are very agreeable and they \"need to\ncheck one part numbers, etc.\" but never return a call. When I call them\nback, I get the same very polite and agreeable \"need to check....\".  I have\ndone this 3 times without getting any info from them.\n\nThe problem is not in the Control Box - they both work well with the\nworking KP-2 70CM preamp.\n\nHave any of you repaired a KP-2 2M preamp?\n\nDo any of you have a schematic diagram of this preamp?\n\nDo any of you know the part number of the gasfet transistor? (I'm thinking\nits the problem)\n\nDetails:  I have cleaned up and tested the preamp. It seems that the\ninternal bias-tee relay is working properly and there are voltages on the\ntransistors that seem to match the working KP-2 70CM preamp. The preamps\nwere mounted on my M2 circularly polarized arrays at a previous QTH.\nPresently, I'm setting up two much smaller antennas and I want to use these\npreamps. I'm reasonably sure its the gasfet transistor. I Googled this\ntopic extensively and I find other hams asking this same question without\nan answer in postings from 2001 to 2012. No schematic and no part number\nfor the gasfet. At $200 each, I want to try to repair it.\n\nAny help would be appreciated.\n\nThanks & 73, Larry W7DGP\n",
    "attachments": []
}