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Original price $26.99
Original price $26.99 - Original price $26.99
Original price $26.99
Current price $24.99
$24.99 - $24.99
Current price $24.99

Digitrax DH165Q1 HO Scale Diesel Locomotive QSI Style

Board Replacement DCC Decoder

Replace the existing light board in your HO Scale Life-Like & Proto 2000, Atlas, Intermountain, and other Diesel Locomotives that have a factory equiped QSI Sound. The DH165L0 DCC Decoder is compatible with Sound Bug only decoders.


  • QSI-style PCB replacement Plug N’Play decoder-
  • Allows replacement with new technology downloadable SFX SoundBug modules
  • Accepts Plug-in SFX SoundBug sound modules
  • Excellent power management-
  • Booster or Programmer overloads
  • Regulated Headlights: convenient no-resistor install of LEDs and lamps.
  • Digitrax LocoMotion® System-
  • Your locomotives look like the real thing. The Digitrax LocoMotion System makes them run like the real thing, too!
  • Torque Compensation for smooth as silk silent operation.
  • 128 Speed Step operation (14 or 28 steps can also be used).
  • Momentum with acceleration and deceleration.
  • Normal Direction of Travel is user selectable.
  • 3 Step Speed Tables set start, mid and max voltage for custom control.
  • 28 Step Speed Tables with 256 level resolution for precise control.
  • Scalable Speed Stabilization with simple setup & 1024 level resolution.
  • SuperSonic motor drive for silent operation.
  • FX3 Functions for prototypical lighting effects:
  • Constant Brightness Lighting directional or independent control.
  • Realistic Effects like Ditch lights, Mars lights, strobes, and many more.
  • Dynamic and Static Qualifiers operate functions based on direction, F0 on or off, loco direction and F0, and whether loco is moving.
  • Function Remapping for custom function setup.
  • Master Light Switch turns off all lights & functions with one keystroke.
  • Advanced Consist Function Controls
  • Transponder equipped ready for transponding on your layout.
  • Compatible with digital surround sound systems
  • All Mode Programming with Operations Mode Read Back-read back CV values right on the mainline.
  • Decoder Factory CV Reset with or without speed table initialize.
  • Motor Isolation Detection prevents damage to your decoder.
  • Basic, Advanced & UniVersal Consisting
  • 2 Digit and 4 Digit Addressing

DH165Q1 Instruction Sheet

Digitrax Decoder Manual