Hello,
I am beginning to bild a small layout
I see in MRM a lot of trackplans with backloops sometimes more than one in the same plan.
How is that possible? Is that not bad for de DCC decoders? I have a Walthers loc with DCC and sound.
Also how das this work an a turntabel.
Please explain it to me.
Thanks.
Jan.
With DCC, an auto reverse module such as the Digitrax AR-1 (a mechanaical relay) or totally electronic one such as the PSX-AR take care of the polarity switching automatically.
As Cajole advises, a reversing loop, wye or turntable require isolation and in DCC, the reversing section polarity gets flipped, instead of the mainline. A loco in the loop just keeps going in the same direction, basis its instructions, but using the flipped signal appropriately. It happens so fast that it is an invisible effect. You can get auto reverser circuit boards for about $32 and up. See the OnGuard OG-AR, for instance:
http://www.tonystrains.com/products/dccspecialties.htm
If getting into DCC you might find the wiringfordcc site very helpful. I also like one of the MR books (DCC Guide) available on the MR site.
http://www.wiringfordcc.com/intro2dcc.htm
Paul
Modeling HO with a transition era UP bent
Also, Welcome to the Forums.
Elmer.
The above is my opinion, from an active and experienced Model Railroader in N scale and HO since 1961.
(Modeling Freelance, Eastern US, HO scale, in 1962, with NCE DCC for locomotive control and a stand alone LocoNet for block detection and signals.) http://waynes-trains.com/ at home, and N scale at the Club.