User Manual
INSTALLATION
Since there is no motor output in this sound decoder, it can be used in any locomotive, regard-
less of scale that already has a working power decoder installed. If used in large scales where
track voltage exceeds 16 volts, (O/G scales), a special voltage reducer is required to be used
in-line to the Sounder. Contact Model Rectifier Corp. for details and price.
To install the Sounder into a locomotive, simply solder the red and black wires to any power pick
up points, left and right side wheel pick ups, along with the red and black wires of your power
decoder. If using with higher voltage DCC applications for larger scales, solder the MRC voltage
reducer to either the red or black wire between the Sounder, and the power pick up point. You
should have some basic electrical knowledge and soldering skills. If you do not have the above
requirements, please ask the dealer for help with the installation.
SPEAKER SELECTION
The “MRC Sounder” diesel sound only decoder comes with a 28mm round 8-ohm speaker. If it is
too large for your application, smaller speakers, 20mm, or 16 X 35mm rectangular, can be
purchased from MRC, or other manufacturers. Reducing speaker size will affect the overall
sound quality of this decoder. Placement of the speaker inside the locomotive is up to you. Use
hot glue or double-sided sticky tape to affix the speaker inside the locomotive shell.
OPERATION
There are 34 different horns sounds and 8 bell sounds, along with an “off” setting for each built
into this decoder for you to choose from. See programming chart for selecting the type you
want. The “off” setting is useful for trailing locomotives in a consist so only the lead unit sounds
its horn and bell.
If your DCC system supports higher functions, F13 to F28, you can use these functions to
change the type of bell sound, F18, or horn sound, F19 on the move, without having to go into
“ops mode” programming or by changing CV values.
Note: Bell, Dynamic Brake and Rail Wheel Clack cannot play at the same time.
If you activate the Bell sound [F1], while either the Dynamic Brake or Rail
Wheel Clack sounds are activated, the Bell sound will override the other 2
sounds. Rail Wheel Clack cannot play while the loco is in idle. When you turn
off Dynamic Brake and Rail Wheel Clack sound there will be one second
delay.
Function Idle/Moving
F0 Headlight on/off
F1 Bell on/of f
F2 Hor n
F3 A ir r eleas e
F4 Coupling
F5 Brake release (idle) / brake squeal (moving)
F6 Dynamic brake on/off (you loco may not have this brake)
F7 Air hose firing/uncoupling lever
F8 Click 3 times w ill shut dow n / notch dow n w hile CV 122=3
F9 Engine cooling fan / notch up w hile CV122=3
F10 Rail w heel clack (only moving)
F11 Traction air compressor
F12 Select diesel rumble type, total 4 types
F13 short air release
F14
flange noise
F15 A ir pump
F16 Associated loco sound
F17 flange noise
F18 Change bell type (use F1 to turn off bell after adjustment)
F19 Horn type select (total 34 different horns)
F20 Associated loco sound
F21 Change bell volume (use F1 to turn off bell after adjustment)
F22
Change horn volume
F23
Change diesel rumble volume
F24 Coupling
F25
air release
F26
flange noise
F27 Air hose firing
F28
air release
CV Register Description Range Default
CV1 R1 Short address 1-127 3
--- R6 Page number --- ---
CV29 R5 Basic configuration --- 2
CV7 R7 Manufacturer version number --- 32
CV8 R8 Manufacturer ID --- 143
CV17 --- Long address upper byte 192-231 192
CV18 --- Long address lower byte 0-255 3
CV19 --- Advanced consist address 0-127 0
CV50 --- Horn type 0-16 4
CV51 --- Horn volume 0-3 3
CV52 --- Bell type 0-7 3
CV53 --- Bell volume 0-3 3
CV54 --- Bell ring rate 0-50 3
CV55 --- Diesel rumble volume 0-3 3
CV56 --- Brake squeal volume 0-3 3
CV57 --- Dynamic brake volume 0-3 3
CV58 --- Air release volume 0-3 3
CV59 --- Air pump volume 0-3 3
CV60 --- Safety pop valve volume 0-3 3
CV61 --- Engine cooling fan volume 0-3 3
CV62 --- Coupling volume 0-3 3
CV63 --- Random noise volume 0-3 3
CV64 --- Rail wheel clack 0-3 3
CV105 --- User identification number 0-255 0
CV106 --- User identification number 0-255 0
CV113 --- Coupling fire volume 0-3 3
CV114 --- brake release volume 0-3 0
CV115 --- Auto brake squeal enable/disable 0-1 1(enable)
CV116 --- Coupling sound type 0-2, 0=off 1
CV120 R3 Acceleration 0-32 0
CV121 R4 Deceleration 0-32 0
Diesel notch mode, 0=auto-notch
3=manual notch
CV123
Diesel rumble type, total 4 types
0-3 1
CV125 ---
Factory def ault setting, program it to1 w ill
restore all the CV to default settng
--- 0
0CV21 ---
When CV21=0, all accessory functions
will follow its own address. When
CV21=1, all functions will follow the
---
CV122 --- 0-3 0