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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/V4HKVQE6MWEOG42ADQ6FVAVAKZ3WU5PR/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "V4HKVQE6MWEOG42ADQ6FVAVAKZ3WU5PR",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/V4HKVQE6MWEOG42ADQ6FVAVAKZ3WU5PR/?format=api",
    "sender": {
        "address": "kc6uqh (a) cox.net",
        "mailman_id": "d9201820d18047e4a2772c86bda5e111",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/d9201820d18047e4a2772c86bda5e111/emails/?format=api"
    },
    "sender_name": "[email protected]",
    "subject": "[amsat-bb] Re: DTMF on HF?",
    "date": "2014-01-11T05:24:00Z",
    "parent": null,
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Howie,\nThe original Marine selective call used two tones which toggled controlling\na mechanical escapement. At \nthe end of each 0-9 digit the hold tone was kept on & a pawl would hold the\nescapement wheel if a pin was placed for that number in the wheel. The next\ndigit would then be dialed. If it was the correct number the escapement\nwould move around to a fixed contact that would sound a bell. If it was the\nwrong digit the wheel would return to the start position. This system was\nused on Marine and land mobile phone systems until the SS revolution in the\n70's\n\nArt,\nKC6UQH\n\n\n\n-----Original Message-----\nFrom: [email protected] [mailto:[email protected]] On\nBehalf Of Howie DeFelice\nSent: Friday, January 10, 2014 12:18 PM\nTo: [email protected]\nSubject: [amsat-bb] Re: DTMF on HF?\n\nBob,\n\nI don't have any experience using DTMF on HF but back in the day before\nsatcom, commercial marine HF SSB coast stations used a dual tone selective\ncalling system made by Lorain Electronics. The encoder used 11 tones, one\neach for the digits 0-9 and a carrier tone. Each digit was transmitted along\nwith the carrier tone and the difference in frequency was detected to decode\nthe digit. This compensated for small frequency variations. These worked\nvery well. You could probably do a similar thing with a single row or column\nof DTMF if you didn't need more than 4 digits. \n\nHowie AB2S \t\t \t   \t\t  \n_______________________________________________\nSent via [email protected]. Opinions expressed are those of the author.\nNot an AMSAT-NA member? Join now to support the amateur satellite program!\nSubscription settings: http://amsat.org/mailman/listinfo/amsat-bb\n\n",
    "attachments": []
}