Spectrum 2-8-0 Decoder Buzzing

Discussion in 'DCC & Electronics' started by ScottyB, Oct 29, 2005.

  1. ScottyB

    ScottyB Member

    I just got a brand new Spectrum 2-8-0 with DCC on board. But at low speeds (it's a 28 speed step decoder) - until about speed step 9, the motor buzzes like nothing else, but it does move properly. Speed 10 and above, runs and sounds just fine.

    Is this normal for Bachmann? I don't have any others, and am a little surprised. Or is there a fix for it? Or just a crummy decoder?

  2. MasonJar

    MasonJar It's not rocket surgery

    You may be able to alter this somewhat - check for the CVs that control start and stop voltage, and one I believe Digitrax calls "profile" or something like that. It can help "tune" the decoder to feed power in a way that causes less buzzing. However, in my experience, DCC noises are somewhat different than DC noises.

    The other "fix" is to try different decoders until you find a quiet one. Have you used a recommended decoder, or simply dropped anything in?

  3. ScottyB

    ScottyB Member

    No it's equipped with the decoder it shipped with - one of those Bachmann out of the box DCC equipped locos.

    I'll play around with the CVs a little and see what happens.

  4. GeorgeHO

    GeorgeHO Member

    I don't currently have DCC so I know nothing about it, but is it possible that something is binding up in your loco, and the motor is fighting to overcome it, and when the voltage/current is high enough, the motor wins out and the binding is not a problem anymore?

    PS. I will be buying the same system you are using very shortly just to try it out.

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