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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/ZCGJ633Q23TCPMJNOKJTJUW3LNP2FLP7/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "ZCGJ633Q23TCPMJNOKJTJUW3LNP2FLP7",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/WHKTMBAZOBH34RAFH53KDAJOJU2TSB4D/?format=api",
    "sender": {
        "address": "sfraser (a) sierra.apana.org.au",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "Steve Fraser",
    "subject": "[amsat-bb] Re: Icom PCR-1000 PC controlled receiver",
    "date": "2007-02-10T02:01:52Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/R4HCLEOZBMGXCVKDJ6ILODP5UK2IKI35/?format=api",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Hi All\n\n\n> On Feb 10, 2007, at 11:05, Robert Bruninga wrote:\n> \n>> Does anyone have a PCR-1000 ICOM remote controlled receiver?\n>>\n>> How long can the serial port cable be?  I heard it was operating\n>> at something like 112,000 baud and could not be run the 200 feet\n>> to our roof.  This makes it a deal breaker.\n> \n> It powers up at 9600 baud.  If you use the Icom supplied Windows  \n> software, the first thing it does is change to 38400 baud.\n> \n\nI found this - partial quote follows:\n\nhttp://www.lammertbies.nl/comm/info/RS-232_specs.html\n\nThe standard has a clear answer, the maximum cable length is 50 feet, or \nthe cable length equal to a capacitance of 2500 pF. The latter rule is \noften forgotten. This means that using a cable with low capacitance \nallows you to span longer distances without going beyond the limitations \nof the standard. If for example UTP CAT-5 cable is used with a typical \ncapacitance of 17 pF/ft, the maximum allowed cable length is 147 feet.\n\nThe cable length mentioned in the standard allows maximum communication \nspeed to occur. If speed is reduced by a factor 2 or 4, the maximum \nlength increases dramatically. Texas Instruments has done some practical \nexperiments years ago at different baud rates to test the maximum \nallowed cable lengths. Keep in mind, that the RS232 standard was \noriginally developed for 20 kbps. By halving the maximum communication \nspeed, the allowed cable length increases a factor ten!\n\ncheers\n\nSteve\n",
    "attachments": []
}