Skip to content

Hornby R8118 TTS Sound Decoder: Class 20 Diesel

by Hornby
Not 100% sure? If you change your mind simply return your order within 10 days for a full refund. Terms and conditions apply.

TTS Sound Decoder: Class 20 Diesel

IMPORTANT - The decoder does not support sound under DC (analogue) operation. Sounds can only be played under DCC (digital) operation. This applies to all sounds, both running and spot sounds. The locomotive's motor may be controlled under DC operation.   

  • Supports Short and Long addresses
  • Adjustable Acceleration and Deceleration
  • Back EMF Load Compensation
  • Up to 19 controllable spot sounds dependant on model (see label)
  • Two sound hannels allowing for simultaneous play of a locomotive sound and an individual spot sound
  • It is possible to alter volume of each sound through an individual dedicated CV (Range 0-8)
  • The decoder is equipped to support directional front and rear lighting operation via 'F0' on the controller (dependant on locomotive)
  • The decoder is equipped with 1 auxiliary function output controlled by 'F18' or 'F25' dependant on Locomotive type (Diesel or Steam)
  • Motor Current-Maximum continuous - 500mA
  • Motor Current-Peak  1amp (No function load)
  • Function Output Current Maximum - 100mA (Unprotected)
  • Decoder Current Maximum continuous - 800mA (shared motor and functions)
  • Number of Sound Channels - 2
  • Termination - 8-pin Plug (NEM652) NMRA 

Function list

  • F0     Headlight/rearlight
  • F1     Engine start/stop
  • F2     Horn high-low
  • F3     Horn low-high
  • F4     Brake squeal
  • F5     NOTCH up
  • F6     NOTCH down
  • F7     Return to IDLE
  • F8     Thrash
  • F9     Cold start override
  • F10   Horn high two bursts
  • F11   Door slam
  • F12   Fan
  • F13   Horn long high
  • F14   Horn low two bursts
  • F15   Primer
  • F16   Slow flange squeal
  • F17   Spirax valve
  • F18   Horn low
  • F19   Horn high
  • F20   Wagons buffering
  • F21   Wagons clanging
  • F22   Coupling 1
  • F23   Guard's whistle
  • F24   Coupling 2
  • F25   Aux (if used in locomotive)