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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/B7UJ532SLWQXBDOQNYF5K3NRKPNQ4TGI/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "003801c6c68d$2cf9e1e0$9bad0d52@wingswme01",
    "message_id_hash": "B7UJ532SLWQXBDOQNYF5K3NRKPNQ4TGI",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/PYUGLQEXBYB2UWJKGVRYKCLQ4SPYQ55F/?format=api",
    "sender": {
        "address": "Felim.M3HIM (a) ntlworld.com",
        "mailman_id": "de23c7cfd9be4ca296bc289c3113ac5b",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/de23c7cfd9be4ca296bc289c3113ac5b/emails/?format=api"
    },
    "sender_name": "Félim Doyle M3HIM",
    "subject": "[amsat-bb] Re: 67 Hz PL Frequency Tolerance?",
    "date": "2006-08-23T08:21:44Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/PYUGLQEXBYB2UWJKGVRYKCLQ4SPYQ55F/?format=api",
    "children": [
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/IV5NVNMGLTN4366RKJGMXGX24FNDILWY/?format=api"
    ],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "As a general principle what is considered a reasonable tolerance for CTCSS\n(e.g. on repeaters)? As the next frequency up from 67Hz is 69.3Hz +/-2Hz\nsounds very risky. I know not all transceivers support the 69.3Hz tone,\njumping straight from 67Hz to 71.9Hz instead but I believe that this is the\nexception rather than the rule (even my older handhelds all support 69.3Hz).\n\nA quick Google search for \"PL Tone\" yielded this definition on one repeater\nsite ...\n\n\"The system is designed around a set of relatively low frequency tones (32\nor 38 depending on which \"standard\" you use) ranging from 67.0 Hz to 250.3\nHz. The tones are a perfect sine wave and the frequency tolerance is very\ntight, typically +/- 0.5 Hz. The tone is encoded and injected into the\ntransmitter after the audio shaping circuits. The frequency deviation\n(level) is typically 0.4 to 0.8 kHz which is rather insignificant when\ncompared to the typical 5 kHz voice deviation.\"\n\n73 de\n\nFélim M3HIM\nIO91ot\nAylesbury, Buckinghamshire, UK\n----- Original Message ----- \nFrom: \"Bill Ress\" <[email protected]>\nTo: <[email protected]>\nSent: Tuesday, August 22, 2006 7:59 PM\nSubject: [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\n",
    "attachments": []
}