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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/IV5NVNMGLTN4366RKJGMXGX24FNDILWY/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "IV5NVNMGLTN4366RKJGMXGX24FNDILWY",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/PYUGLQEXBYB2UWJKGVRYKCLQ4SPYQ55F/?format=api",
    "sender": {
        "address": "iz5dwf (a) amsat.org",
        "mailman_id": "3dd559508fc24a7a9bcde4058a4811e9",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/3dd559508fc24a7a9bcde4058a4811e9/emails/?format=api"
    },
    "sender_name": "Francesco Messineo",
    "subject": "[amsat-bb] Re: 67 Hz PL Frequency Tolerance?",
    "date": "2006-08-23T09:48:33Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/B7UJ532SLWQXBDOQNYF5K3NRKPNQ4TGI/?format=api",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Hello all,\n\nI don't know the answer about the tolerance of AO-51's tone decoder, but\nif the purpose is to make a tone encoder I can tell how I designed and built\ntwo working encoders for all PL (38 if I remember correctly) tones.\nMy problem was total lack of test instruments at that time, so I had to\nuse a no tune approach. The only thing I could think of was to make a\n\"poor man's\" dds with a microcontroller and an R/2R 8 bit DAC followed\nby a low pass active filter. The only frequency reference is the\nmicrocontroller external crystal oscillator. The only tuning I needed was\non the output level and I just used a multi-turn trimmer and moving it to the\npoint that the tone squelch on a TH-D7 receiver opened. \nThe first unit built is an external one for the TR-9130 vhf radio (it's\na little box with an lcd display and two buttons to chose tone frequency). I use it\nfor AO-51 and SO-50. I've never had problems getting into those two sats.\nThe second unit I built is for the TR-851 and it's internal, using the little\nspace of the original kenwood board. I just had to reverse engineer the signals\nthat the radio generated for the original board (I've never seen one). This\nsecond unit has only been tested with the TH-D7, since I don't think we have\na working satellite with FM tone squelched uplink on the 70 cm band.\nHope it helps.\n\n73 de IS0FKQ \n\n> ----- Original Message ----- \n> From: \"Bill Ress\" <[email protected]>\n> To: <[email protected]>\n> Sent: Tuesday, August 22, 2006 7:59 PM\n> Subject: [amsat-bb] 67 Hz PL Frequency Tolerance?\n> \n> \n> > I've looked through the AMSAT web site and the AO-51 book but can't any\n> > information about the frequency tolerance of the satellite receive\n> > system to the 67 Hz PL tone.\n> >\n> > I believe someone way back when actually did some measurements after it\n> > was launched but I can't find it either. Does +/- 2 Hz sound right? What\n> > about the level (deviation) require? Is it the same for the Mode V and L\n> > receivers?\n> >\n> > Regards and thanks...Bill - N6GHz\n> > _______________________________________________\n> > Sent via [email protected]. Opinions expressed are those of the author.\n> > Not an AMSAT-NA member? Join now to support the amateur satellite program!\n> > Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb\n",
    "attachments": []
}