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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/CNUM3RGYP6V6TGOA6W33GM26MNI7JZ7X/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "[email protected]",
    "message_id_hash": "CNUM3RGYP6V6TGOA6W33GM26MNI7JZ7X",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/P2WZ4H4YRJUOXPKOUVMHQPKDGVVPRB7T/",
    "sender": {
        "address": "wb4gcs (a) wb4gcs.org",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "Jim Sanford",
    "subject": "Re: [amsat-bb] funcube dongle",
    "date": "2015-02-12T23:40:59Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/677H2VPFQIFWK2PYJEHG7TIGKDSWMMRT/",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "There is software available for the RaspberryPi which will let you \nextend USB as far as you can run Ethernet.  One USB port is free, more \nthan that requires a license.\n\nI have not tested it yet, but will use it to put a FCD connected to omni \nantennas on my tower as a monitor receiver.  The tower is 350' from the \nhouse.\n\n73,\nJim\[email protected]\n\nOn 2/11/2015 11:50 PM, Pavel Milanes Costa wrote:\n> On the subject of using ethernet UTP CAT 5/6 cable for making USB \n> extenders...\n>\n> I have a kind if experience on that, you can reach about 15-20m runs \n> easily without losing connection to the usb dongle (even wifi dongles)\n>\n> If you want to go for sure, don't use more than 12m... from there on \n> is a challenge, I use on daily basis a run of 14m switching from \n> RTL-SDR and a WIFI dongle, as always your mileage may vary.\n>\n> The better way to cable the extender with UTP CAT 5/6 is this (my \n> experience):\n>\n> The 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 \n> for D-\n>\n> If your dongle get disconnected or errant behavior use the free pair \n> to add one more wire to each GND and +5 volts lines. (more wires in \n> parallel = less resistance = less voltage drop)\n>\n> Put 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 \n> computer between the GND and +5V (10uF is electrolytic, watch out the \n> polarity)\n>\n> The ferrite will protect you a little from a nearby TX station (full \n> duplex?)\n>\n> With this setup I can run a wifi dongle at runs from 12, and some \n> times I put the RTL-SDR there too...\n>\n> Don't be tempted to put more uF on the far end 10uF is good, you can \n> kill your USB port by putting something in the order of 3300 uF or \n> more (Been there, done that, got my USB port killed)\n>\n> Don't use this extension cable on accessory USB ports, use only the \n> rear ports of your motherboard.\n>\n> You will lose some bandwidth, My RTL dongle runs easily 2.8 Mhz on the \n> PC and on the far end of the extension it only reach about 2.2 Mhz\n>\n> Things to note:\n> - UTP cat 6 is better\n> - Shielded UTP is even better, the shield must be connected only on \n> the PC 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 \n> high power, but 2m 50W don't seem to harm on my case (if you forgot \n> the ferrites you will be killed by 2m TX too)\n>\n> I hope this can help, 73 from CO7WT.\n>\n> El 11/02/15 a las 21:41, Stephan Greene escribió:\n>> This approach would work well, I think for portable ops, too. Maybe \n>> 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> _______________________________________________\n> Sent via [email protected]. AMSAT-NA makes this open forum available\n> to all interested persons worldwide without requiring membership. \n> Opinions expressed\n> are solely those of the author, and do not reflect the official views \n> of AMSAT-NA.\n> Not an AMSAT-NA member? Join now to support the amateur satellite \n> program!\n> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb\n>\n\n\n---\nThis email has been checked for viruses by Avast antivirus software.\nhttp://www.avast.com\n\n",
    "attachments": []
}