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DCC model rail wiring

Discussion in 'Electrical Engineering' started by Cosmopolite, Jan 19, 2010.

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  1. Cosmopolite

    Cosmopolite Guest

    Does anyone on this group have knowledge of the DCC system for model rail?
    I'm a one finger typist, so I would like to save time by not explaining
    the system, unless I have to, when I ask the question that I need an
    answer to.
     
  2. Rich.

    Rich. Guest

    You're not alone. Quite often I've had to get my message across using only
    one finger.
     
  3. Adrian C

    Adrian C Guest

    g o g g l e

    o r

    w i k i p e d i a

    http://en.wikipedia.org/wiki/Digital_Command_Control
     
  4. Cosmopolite

    Cosmopolite Guest

    I know the system, what I need, is advice on capacitive and resistive
    reactance as well as the " ringing " effect. I merely posed the preamble
    because It would take time to explain the technical aspects of DCC.
     
  5. Adrian C

    Adrian C Guest

    Sorry, I misread your preamble as a request to find information to
    preamble DCC information to someone elsewhere off group, not here!!

    The area you are asking about is 'transmission line' effects on digital
    signals, something one of the sci.electronics... groups would probably
    be more suitable to find information.

    However, since it is a digital bus, the following ethernet related might
    be of interest?

    http://www.citap.com/documents/tcp-ip/tcpip021.htm

    Any specific question unanswered or in the pipeline?

    :)
     
  6. Cosmopolite

    Cosmopolite Guest

    Thank's for the link, I saved the page for future info.

    Most DCC users twist the bus wires and use the proper resistor and
    capacitor to terminate the bus, even though it is not a requirement by
    Digitrax, a DCC manufacturer.

    I purchased 2 x 20 m. of 12 ga. bus wire from the electrical contractor
    who does our plant maintainance. He threw in 20 m. of 14 ga. insulated
    grounding wire and told me to spiral it around the bus, starting at the
    power supply and to ground it at the other end,instead of using the
    standard termination procedure.

    With this setup, could I also leave the bus wires un-twisted, easier to
    make track feeder connections, and still eliminate the emi ?
     
  7. James Sweet

    James Sweet Guest


    I would think this system runs at a low enough speed that you can get
    away with a lot. That said, I would just twist it and terminate it
    properly, the termination components are a few cents, the twisting is
    not hard to do, but you could always just hook it up and see if it
    works. Nobody will die if there are issues.
     
  8. Cosmopolite

    Cosmopolite Guest

    No such thing as a bad question, but there are bad answers. :)
     

  9. No, but much more likely is:

    You've got to be a retard.

    Much more believable.
     
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