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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/OJ7L53UL4PAPIT4PKIZXV7SK434VWFH2/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "OJ7L53UL4PAPIT4PKIZXV7SK434VWFH2",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/OJ7L53UL4PAPIT4PKIZXV7SK434VWFH2/?format=api",
    "sender": {
        "address": "rhyolite (a) leikhim.com",
        "mailman_id": "985567232022459983a4040e15f7d9a3",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/985567232022459983a4040e15f7d9a3/emails/?format=api"
    },
    "sender_name": "Joe Leikhim",
    "subject": "[amsat-bb] Fwd: Re:  Re: DTMF on HF?",
    "date": "2014-01-11T05:20:48Z",
    "parent": null,
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "\n\t\n\n\t\n\n\t\n\n\t\n\n\n\nTrue,\nBut fixing on the receive end would be more spectrum efficient. And you\nneed to autotune the suppressed carrier anyway requiring receiver side\ncomplexity, so why not give DSP a challenge to do it in the blind?\n\nWith DSP so readily available, I am surprised doppler correction of\nvoice has not been explored.\n\n\nOn 1/11/2014 12:05 AM, [email protected] wrote:\n> Joe,\n>   A -16dB pilot carrier would solve the frequency offset problem. This was a\n> common solution for Marine shore stations in the last century.\n> Art,\n> KC6UQH\n>\n> -----Original Message-----\n> From: [email protected] [mailto:[email protected]] On\n> Behalf Of Joe Leikhim\n> Sent: Friday, January 10, 2014 2:31 PM\n> To: [email protected]\n> Subject: [amsat-bb] Re: DTMF on HF?\n>\n> Since DTMF has two tones for each number, it would seem possible that you\n> could have some DSP detect the difference frequency of each pair and then\n> either adjust its decoders or QSY the receiver's VCO to get a lock.\n> There are a ton of small development boards like Raspberry PI that have\n> hardware that might be able to do this.\n>\n> Has anybody got the AMSAT-bb daily digest to work through their e-mail\n> provider other than Gmail?\n>\n> --\n> Joe Leikhim\n>\n>\n> Leikhim and Associates\n>\n> Communications Consultants\n>\n> Oviedo, Florida\n>\n> [email protected]\n>\n> 407-982-0446\n>\n> WWW.LEIKHIM.COM\n>\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>\n\n-- \nJoe Leikhim\n\n\nLeikhim and Associates\n\nCommunications Consultants\n\nOviedo, Florida\n\[email protected]\n\n407-982-0446\n\nWWW.LEIKHIM.COM\n\n\n\n",
    "attachments": []
}