Skip to main content

All:

In discussions on another topic, someone reported a potential problem with DCS while using zipcord. 

When 2 conductors in the same circuit are close, there is a capacitance effect.  This has no effect on a wire to a lamp, for example.  But when sends higher frequency signals, it could have an effect.  On my layout, I use 14-gauge stranded  THHM wire, available at Lowes, Home Depot, probably Menards, and many good hardware stores.   I keep hot and ground separated.

If you have 2 conductors from different circuits, say 2 hots feeding separate blocks, close together, you MAY experience inductance between them, that a signal on one induces a signal current on the other.

These issues aren't present if one only runs conventional.  But they MAY be if one uses a system that sends signals over the wires to issue commands to locos.

In my new layout which is TMCC only, I plan to use 12 or 14 gauge zipcord for my bus wiring.  I'm wondering if this is going to be a problem or if anyone else has seen problems with this.  The layout will be rather large (11' x 47'), so I'm trying to avoid creating an issue.

Thanks in advance,

George

Original Post

Replies sorted oldest to newest

Usually, this is an issue for signal/data cables. Hence the term Twisted Pair which tends to minimize the bleeding of the signal and corruption issues. The TMCC/Legacy signal goes out on the Nuetral lead that you connect from the operative base (TMCC or Legacy, not both) to the outside rail which acts as a transmitting antenna to the Locomotives. Word has it that the signal also appears on cold water pipes and house electrical wires. There have been many Posts in the past by our esteemed guru of signal transmission, Dale Mannequen, may he RIP. 

Where this does become an issue is n Ladder yards or any where that track is adjacent to one another. Each outside rail transmits a signal and since the signal could be delayed and still picked up by a locomotive, the signals received are out of phase and hence the reception by the locomotive is seen as corrupted and hence discarded by the Locomotive. 

Loose-Caboose posted:

Usually, this is an issue for signal/data cables. Hence the term Twisted Pair which tends to minimize the bleeding of the signal and corruption issues. The TMCC/Legacy signal goes out on the Nuetral lead that you connect from the operative base (TMCC or Legacy, not both) to the outside rail which acts as a transmitting antenna to the Locomotives. Word has it that the signal also appears on cold water pipes and house electrical wires. There have been many Posts in the past by our esteemed guru of signal transmission, Dale Mannequen, may he RIP. 

Where this does become an issue is n Ladder yards or any where that track is adjacent to one another. Each outside rail transmits a signal and since the signal could be delayed and still picked up by a locomotive, the signals received are out of phase and hence the reception by the locomotive is seen as corrupted and hence discarded by the Locomotive. 

Yes, you are right.  I had forgotten that DCS transmits signals through the center rail using the AC Hot wire whereas TMCC doesn't use AC Hot / Ground track feeders at all, relying on a single wire to the other outside rail.  It's been so long since I wired my old layout (2006-7-8) that I had forgotten.

As Roseanne would say "Never mind". 

rosanne

And I did have a problem with a yard on both my layout and a friend's (which I designed).  The ground plane fixed both of these issues PDQ.

Thanks,

George

Attachments

Images (1)
  • rosanne
Last edited by G3750

Add Reply

Post
×
×
×
×
Link copied to your clipboard.
×
×