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MRC HO Scale DCC Platinum 16-Bit Sound Decoder Dro

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  • MRC HO Scale DCC Platinum 16-Bit Sound Decoder Dro

    Well, I belong to an HO model railroad club and bought my very first "dismal" in 35 years. All my other lokies have been HO, On30, Large Scale 1:20.3 steam engines. I got an Atlas HO Gen Set and installed MRC HO Scale DCC Platinum 16-Bit Sound Decoder Drop-in for Atlas Genset 1916.

    It runs fine and sounds great in forward. In reverse the sound is good but the engine leaps to about 20 MPH when the throttle is cracked open.[:-cry] Had our club DCC guru look at reprogramming the decoder, but he could not figure it out. The manual with the decoder not so helpful in programming acceleration rates in reverse.

    The Atlas model of this interesting prototype is a very smooth locomotive. I was wondering if anyone has ideas how to program the acceleration rate of this MRC decoder when running in reverse to emphasize this smooth running???

    Thanks for all help.

    Doc Tom[:-cowboy]

  • #2
    Does your club (or the DCC guru) have access to JMRI's Decoder Pro? I have no experience with that MRC decoder, but Decoder Pro usually does a decent job of showing which of the myriad CV actually matter in a given decoder.

    My only other thought is this: Did you run the genset on DC before you installed the decoder? If something's wrong with the mechanism, it would show up on both DC and DCC. If the mechanism is OK on DC, the issue pretty much has to be in the decoder.
    James

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    • #3
      Hi Tom, one thing you have to be sure of is if you have your decoder set for acceleration and deceleration - Otherwise known as “Momentum”, these settings affect the time that the loco goes from a standstill to full throttle setting to simulate the drag a real train experiences when hauling a load. Again the locomotive traveling in reverse will think it is “light” and will start and slow down faster then it will when pulling a mile long freight train forward. Just something to check for.

      Also, if you have done many CV changes, you may have to go to Re-setting a decoder to it’s Factory Defaults and start again programming - Most newer decoders have a CV to re-set the decoder back to it’s original settings. If you goof, and your decoder does not respond to it’s address or functions, follow the decoders instructions to re-set. On some older decoders that do not have this feature, sometimes going CV by CV, and following the default setting values listed in the instructions, and inputting these values into each CV, might bring the decoder back to life. New MRC decoders have a CV #125 reset. This CV changes CV # 1 to address 3 and resets CV # 29 for a two digit address. It does not affect any of the custom settings for sounds, you may have programmed into your decoder. It does however reset the custom speed curves you may have programmed in. CV125 = 1.


      Louis L&R Western Railroad
      Pacific Northwest Logging in the East Coast

      Comment


      • #4
        quote:


        Originally posted by jbvb


        Does your club (or the DCC guru) have access to JMRI's Decoder Pro? I have no experience with that MRC decoder, but Decoder Pro usually does a decent job of showing which of the myriad CV actually matter in a given decoder.

        My only other thought is this: Did you run the genset on DC before you installed the decoder? If something's wrong with the mechanism, it would show up on both DC and DCC. If the mechanism is OK on DC, the issue pretty much has to be in the decoder.


        Hi. Thanks for the rapid response. One club member does use JMRI to schedule our operating sessions. I will get with him about your suggestions.

        Also "out of the box" the Genset crept along

        in both forward and reverse. One Of the reasons I went with Atlas is their very good mechanisms.

        I appreciate any further ideas. Doc Tom

        Comment


        • #5
          quote:


          Originally posted by desertdrover


          Hi Tom, one thing you have to be sure of is if you have your decoder set for acceleration and deceleration - Otherwise known as “Momentum”, these settings affect the time that the loco goes from a standstill to full throttle setting to simulate the drag a real train experiences when hauling a load. Again the locomotive traveling in reverse will think it is “light” and will start and slow down faster then it will when pulling a mile long freight train forward. Just something to check for.

          Also, if you have done many CV changes, you may have to go to Re-setting a decoder to it’s Factory Defaults and start again programming - Most newer decoders have a CV to re-set the decoder back to it’s original settings. If you goof, and your decoder does not respond to it’s address or functions, follow the decoders instructions to re-set. On some older decoders that do not have this feature, sometimes going CV by CV, and following the default setting values listed in the instructions, and inputting these values into each CV, might bring the decoder back to life. New MRC decoders have a CV #125 reset. This CV changes CV # 1 to address 3 and resets CV # 29 for a two digit address. It does not affect any of the custom settings for sounds, you may have programmed into your decoder. It does however reset the custom speed curves you may have programmed in. CV125 = 1.


          Thanks Louis. This is a new MRC decoder and I do not recall touching the momentum feature. However I do wonder if when we set up a four digit address we fouled something up.

          Going back to factory settings may be a way to get the "curves" right.

          This has been an interesting electronic challenge.

          Doc Tom

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