DCC
DCC, Digital Command Control for Model Trains. Find DCC System Information, Sales,
Controller, Decoder, Guides and more. How to Install DCC for your Model Railroad
Train. DCC Control Systems. DCC made Easy.
Photo - A DCC decoder installed in an N scale steam locomotive
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DCC
locomotives on the same electrical section of track can be independently controlled. While DCC is only one of several alternative
systems for digital model train control, it is often misinterpreted to be a generic term for such systems. Several major manufacturers offer
DCC systems.
A DCC command station, in combination with its booster, modulates the voltage on the track to encode digital messages while
providing electric power.
The voltage to the track is a bipolar DC signal. This results in a form of alternating current, but the DCC signal does not follow a sine
wave. Instead, the command station quickly switches the direction of the DC voltage, resulting in a modulated pulse wave. The
length of time the voltage is applied in each direction provides the method for encoding data. To represent a binary one, the time is
short (nominally 58µs for a half cycle), while a zero is represented by a longer period (nominally at least 100µs for a half cycle).
Each locomotive is equipped with a mobile DCC decoder that takes the signals from the track and, after rectification, routes power to
the motor as requested. Power can also be routed to lights, smoke generators, and sound
generators. A stationary decoder can be
attached to the rails to allow control of turnouts, uncouplers, operating accessories (such as station announcements) and lights.
In a segment of DCC-powered track, it is possible to power a single analog model locomotive, by itself or in addition to the DCC
equipped engines. The technique is known as zero stretching. Either the high or the low pulse of the zero bits can be extended to
make the average voltage (and thus the current) either forward or reverse.
However, because the raw power contains a heavy AC
component, DC motors heat up much more quickly than they would on DC power, and some motor types (particularly coreless electric
motors) can be damaged by a DCC signal.
This information found:
Wikipedia Encylopedia
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