DCC model rail wiring

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

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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.

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?

:-)

Maybe subscribe to the Yahoo group "Electronics_101" but be careful because there are two groups with similar names. One is just full of trolls, spammers and undesirables.

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 ?

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.