DCC decoders used on non-DCC layouts?

Discussion in 'FAQs' started by zeeglen, Oct 17, 2003.

  1. zeeglen

    zeeglen Member

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    A couple questions on DCC decoders - can anyone help on this?

    Checking the NMRA specs, it seems that the ability of a DCC decoder to operate on non-DCC trackwork is not mandatory, it is only recommended.

    Does anyone know of any brands /models of decoders that do NOT revert to standard non-DCC operation when the track is powered with either pure DC, sinusoid pulses, or rectangular pulses (all unipolar of course)?

    For decoders that DO revert to standard operation under the above conditions, does anyone know if they still allow external speed measurement/control by using the motor back emf? Or is the motor back emf prevented from returning to the rails?

    Thanks!
  2. Gary Pfeil

    Gary Pfeil Active Member

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    I know Soundtraxx decoders won't work with DC, their new "Tsunami", due in December I believe, will. Don't know about the back emf. I would guess that if the back emf were turned on while on a DCC layout it might stay on even on the DC layout.

    Gary