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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/3ZI73ODZ4HZKNEE37XEXBI5NEYHUW25E/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "01b201cdef76$cc279d20$6476d760$@beat",
    "message_id_hash": "3ZI73ODZ4HZKNEE37XEXBI5NEYHUW25E",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/3ZI73ODZ4HZKNEE37XEXBI5NEYHUW25E/",
    "sender": {
        "address": "gregory.beat (a) comcast.net",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "Greg Beat",
    "subject": "[amsat-bb] Re: Icom AG-25 schematic",
    "date": "2013-01-10T21:09:35Z",
    "parent": null,
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Bob -\n\nHere are the documents, web links, and answers from QRZ Q&A.\nhttp://forums.qrz.com/showthread.php?290978-3SK121-FT-726R-70cm-module-Q01\n\nAMSAT-BB -- December 23, 2001 (Joe Leikhim, K4SAT)\nhttp://www.amsat.org/amsat/archive/amsat-bb/200112/msg00609.html\n\nToshiba 3SK121 -- TOSHIBA TRANSISTOR Dual-Gate, UHF, 10V, Idss>20mA, Up<4V \nDatasheet (largely in Japanese).\nhttp://www.datasheetcatalog.org/data.../499109_DS.pdf\n\nThe Icom mast-mounted pre-amplifiers (AG-25, AG-35) use the dual gate 3SK121\nDual Gate FET.\nThe 2 schematics/manuals for the Icom AG-25 and AG-35 units are at QRZ page.\n \nYou will see Internet recommendations for the 3SK121 replacement on AMSAT\nand \nVHF/UHF DX discussion boards based on this usage by Icom.\nThese two distributors indicated they had inventory of this Toshiba\nDual-Gate FET.\n \nXS Micro \nhttp://www.xsmicro.com/rfq.php?pn=3S...&ref=octoparts\n\nand Express Electronics (UK)\nhttp://www.express-elect.com/\n\nI have seen one Eastern Asia exporter (eBay Seller id: my_mkchan) based in\nHong Kong \noffer a variety of Yaesu parts, including some hard to find (no longer mfg.)\ntransistors.\n \nI have seen the European CF-739 or BF981 listed as a suitable substitute.\n When you substitute check Noise Figures and Gain for your application.\n \nBEWARE of Counterfeit (Fake) Semiconductor Parts from Asia .....\nhttp://sound.westhost.com/counterfeit.htm\n\n===\nw9gb\n\n \n----- Original Message ----\n> From: Bob- W7LRD <[email protected]>\n> To: [email protected]\n> Sent: Wed, January 9, 2013 4:05:35 PM\n> Subject: [amsat-bb] here's a good one!\n> \n> Getting ready for a AO-7A pass, started keying the transmitter, I \n>noticed the computer monitor was blinking very nicely in time with the \n>cw, also the az and el indicators on the G5500 control unit were dancing\naround in tune with the cw.\n>In fact they danced in tune even with the power off. Tipped over \n>satellite tower, got out ohm meter, direct open through the 2M Icom \n>AG-25 preamp. Jumped around the now removed preamp and we're back in \n>business. Question...The relay contacts seem to be suspect. Should I \n>get parts and repair the AG-25 or get a better preamp, as I am going to \n>scratch some EME efforts off my bucket list. If you have a better 2M preamp\n\"laying \" around let me know.\n>\n> as always\n> 73 Bob W7LRD\n\n\n",
    "attachments": []
}