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?
Any specific question unanswered or in the pipeline?
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.
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