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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/EPUHUSEUGUSJQCVH45QWYEASE2ROTWYS/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "EPUHUSEUGUSJQCVH45QWYEASE2ROTWYS",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/SLSWYSWDGANRG4WEYLZT75RZQSVUZTZ4/?format=api",
    "sender": {
        "address": "worth (a) maui.net",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "Tom Worthington",
    "subject": "Re: [amsat-bb] Foxtelem and FT-736R",
    "date": "2015-10-15T00:21:16Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/YFNOQZA4YRJPZ2KHWF7JDQJ424L5G3DO/?format=api",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Thanks Jim\n73 and Aloha, Tom, NH6Y\n\nOn 10/14/2015 12:04 PM, [email protected] wrote:\n>   Tom, you're really testing my memory, but I just can't remember the mod\n> exactly. I did this mod 15 years ago to a 736 I owned at the time. All I can\n> say is it does work at 9k6 when done. I'm sure the mod is out there\n> somewhere.\n>\n> BWTM\n>\n>   I did find this and I'm 100% sure it's what I did. What a great blast from\n> the past. Good luck...\n>\n>                    ---------------------------\n>                         by James Miller G3RUH\n>\n> These notes tell you where to get FM RX audio direct from the\n> discriminator, and where to modulate the FM TX varactor directly.\n> These mods are non-destructive and take no more than a few\n> minutes.  The signals bypass the \"DATA SOCKET\" for high grade FM\n> operations.\n>\n> The RX mod is suitable for:\n>\n>   *  UOSAT-D 9600 baud downlink and terrestrial links\n>   *  1200 baud AFSK/FM Standard Packet - BUT IT'S UNSQUELCHED.\n>\n> The TX mod is suitable for:\n>\n>   *  FO-20/PACSAT uplink (1200 bps Manchester FM)\n>   *  UOSAT-D 9600 baud uplink direct FSK and terrestrial links\n>   *  1200 baud AFSK/FM Standard Packet.\n>\n>                              ---****---\n>\n>\n>\n> FT736 -  FM Direct from Discriminator\n> -------------------------------------\n> Detected FM direct from the receiver discriminator is available\n> from the RX UNIT at the junction of R91 and C83.  These\n> components are shown in the top right-hand corner of the\n> schematic.\n>\n> Proceed thus:\n>   1. Disconnect FT736 from the mains electricity. (Safety).\n>   2. Remove top cover only.\n>   3. RX Unit is the vertical module on the left.\n>   4. Locate R91 which is about 25mm from the top, 50mm from the\n> radio rear.\n>      the resistor is \"on-end\", and near a couple of glass diodes.\n>   5. Scrape any paint off R91's free end and wet with solder.\n>   6. Your RXaudio lead should be a fine screened cable;  connect\n>    the inner to R91, and the outer braid to a ground point (e.g.\n>    can of TO09)\n>   7. Route the cable out though any convenient aperture in the case.\n>   8. The discriminator sensitivity (FM Normal) as about 6 kHz/volt.\n>\n> The link....\n>\n> ftp://ftp.tapr.org/general/9600baud/96man2x0.txt\n>\n>\n> 73 Jeff kb2m\n>\n>\n> -----Original Message-----\n> From: AMSAT-BB [mailto:[email protected]] On Behalf Of Tom\n> Worthington\n> Sent: Wednesday, October 14, 2015 14:02 PM\n> To: [email protected]\n> Subject: [amsat-bb] Foxtelem and FT-736R\n>\n> The manual for Foxtelem refers to pulling the discriminator signal out of\n> the Yaesu FT-736R for decoding.\n> However, it does not suggest a point on the circuit.\n> I'm thinking to try between Q20 and Q21 on the RX unit.  perhaps a 0.1 uf\n> cap to the collector of Q20?\n> Has anybody else tried this?\n> Thanks, Tom, NH6Y\n>\n>\n\n",
    "attachments": []
}