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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/CY4P22PCKG46HPQ2CEK7KYMVSE7JQVGX/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "[email protected]",
    "message_id_hash": "CY4P22PCKG46HPQ2CEK7KYMVSE7JQVGX",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/FJONXQSUDS4PGTH62V2LBYDZC2IOKAHU/",
    "sender": {
        "address": "w9gb (a) icloud.com",
        "mailman_id": "b156075684ac4750b888b2dd14137a40",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/b156075684ac4750b888b2dd14137a40/emails/"
    },
    "sender_name": "Gregory Beat",
    "subject": "Re: [amsat-bb] FT726R parts available?",
    "date": "2018-02-04T05:47:06Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/FJONXQSUDS4PGTH62V2LBYDZC2IOKAHU/",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Note this FT-726 modification for the PB2441A module (Rx Unit)\nhttp://www.agder.net/la8ak/b51.htm\n\nYaesu FT-726\n\nLA7BI wasn't satisfied with the audio quality of his FT726. First he tried to improve the AGC, and some improvement was found, but still it was some distortion. \nThe datasheet for uPC1037H (Q13) was studied and it seems that the operational voltage on PB2441A No.20 was too high. The same device is used in other transceivers like Icom IC-740 without any problems. The resistor R83=56 ohm was increased to 120-150 ohm for +6V voltage on the IC. The quality is much improved. On later transceivers like Yaesu FT-736 they've gone back to the conventional ring modulator, obviously aware of the problem.\n\nSent from iPad Air\n\n> On Feb 3, 2018, at 11:23 PM, Gregory Beat <[email protected]> wrote:\n> \n> Yes, Consolidated Electronics in Dayton, OH area has that NEC 7-pin SIP part.\n> Look for eBay reseller: ceitron\n> \n> Here is the NEC uPC1037H data sheet\n> http://www.datasheetarchive.com/dlmain/Datasheets-16/DSA-317957.pdf\n> \n> w9gb\n> \n> > Can replacement uPC1037H's be found.\n",
    "attachments": []
}