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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/677H2VPFQIFWK2PYJEHG7TIGKDSWMMRT/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "677H2VPFQIFWK2PYJEHG7TIGKDSWMMRT",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/P2WZ4H4YRJUOXPKOUVMHQPKDGVVPRB7T/?format=api",
    "sender": {
        "address": "co7wt (a) frcuba.co.cu",
        "mailman_id": "e0c3935155ca4fb78cafec35cf64d7f2",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/e0c3935155ca4fb78cafec35cf64d7f2/emails/?format=api"
    },
    "sender_name": "Pavel Milanes Costa",
    "subject": "Re: [amsat-bb] funcube dongle",
    "date": "2015-02-12T04:50:26Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/P2WZ4H4YRJUOXPKOUVMHQPKDGVVPRB7T/?format=api",
    "children": [
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/CNUM3RGYP6V6TGOA6W33GM26MNI7JZ7X/?format=api"
    ],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "On the subject of using ethernet UTP CAT 5/6 cable for making USB \nextenders...\n\nI have a kind if experience on that, you can reach about 15-20m runs \neasily without losing connection to the usb dongle (even wifi dongles)\n\nIf you want to go for sure, don't use more than 12m... from there on is \na challenge, I use on daily basis a run of 14m switching from RTL-SDR \nand a WIFI dongle, as always your mileage may vary.\n\nThe better way to cable the extender with UTP CAT 5/6 is this (my \nexperience):\n\nThe UTP5/6 has 4 pairs of cable:\n\n- Use one pair (two wires) for the GND\n- Use one pair (two wires) for the +5V\n- Use one pair for the data transfer, one wire for D+ and the other for D-\n\nIf your dongle get disconnected or errant behavior use the free pair to \nadd one more wire to each GND and +5 volts lines. (more wires in \nparallel = less resistance = less voltage drop)\n\nPut a little ferrite core (1 cm OD, 3mm H) at each end of the cable \n(just a pass trough) plus a 10nF and 10uF at the far end from the \ncomputer between the GND and +5V (10uF is electrolytic, watch out the \npolarity)\n\nThe ferrite will protect you a little from a nearby TX station (full \nduplex?)\n\nWith this setup I can run a wifi dongle at runs from 12, and some times \nI put the RTL-SDR there too...\n\nDon't be tempted to put more uF on the far end 10uF is good, you can \nkill your USB port by putting something in the order of 3300 uF or more \n(Been there, done that, got my USB port killed)\n\nDon't use this extension cable on accessory USB ports, use only the rear \nports of your motherboard.\n\nYou will lose some bandwidth, My RTL dongle runs easily 2.8 Mhz on the \nPC and on the far end of the extension it only reach about 2.2 Mhz\n\nThings to note:\n- UTP cat 6 is better\n- Shielded UTP is even better, the shield must be connected only on the \nPC side and not to the USB GND line, but to the PC chassis.\n- if not shielded cable, you may get a USB reset if you TX on HF with \nhigh power, but 2m 50W don't seem to harm on my case (if you forgot the \nferrites you will be killed by 2m TX too)\n\nI hope this can help, 73 from CO7WT.\n\nEl 11/02/15 a las 21:41, Stephan Greene escribió:\n> This approach would work well, I think for portable ops, too. Maybe without\n> extenders, just a long USB cable.  I think USB 2.0 is rated to 10-15 ft\n> without boosting the signal.\n",
    "attachments": []
}