INSTALLATION
Since there is no moter 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.
LIGHT EFFECTS WIRING*
If your locomotive has ditch lights, or any type of accessory lights, you can solder wires to the
three solder tabs on the Sounder. The center tab is the common for the light effects. You would
then program CV’s #118 and #119 to choose the desired light effect. Both light effects are
controlled on & off by function 3
(F3)
. There is no independent selection of either light effect. If
you program the effect for ditch lights,
F3
turns them steady on/off, but activation of your horn
function,
F2
, makes them alternately blink automatically.
LIGHT EFFECTS PROGRAMMING CHART FOR CV118/CV119
You would program CV #118/119 to choose the desired light effect. CV118 for ACC1 and CV119
for ACC2. For ditch light both CV118 and CV119 must to 0.
*Note- The light effects operate on the track output voltage supplied by your DCC system. Please
contact the locomotive manufacturer as to the operational voltage of these extra lights, so you
can then choose the proper current limiting resistor (1k to 3k) to add into the circuit to prevent
light bulb or LED failure. Also be careful not to bridge the tabs with solder or wire strands, as to
cause a short circuit and damage the MRC Sounder.
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 sixteen horn sounds and six 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 two sounds.
CV118/119 value
ACC#1/ACC#2 Light effect
0
Ditch light
1
Gyra light
2
Marslight
3
Prime strato light
4
Single strobe light
5
Double strobe light
6
on/off
Fu
n
ct
io
n
Id
le
/M
o
vin
g
F1
Be
ll o
n/
of
f
F2
H
or
n
F3
A
ir
re
le
as
e a
nd A
cc
es
sor
y l
ig
ht
o
n/
of
f
F4
C
oup
lin
g
F5
B
ra
ke
r
el
eas
e (
idl
e)
/ b
rak
e s
que
al
(
m
ov
in
g)
F6
D
yna
m
ic
br
ak
e on
/o
ff
F7
A
ir hos
e f
iri
ng
/u
nc
oupl
ing
le
ve
r
F8
3
t
im
es
w
ill
sh
ut
d
ow
n w
he
n in
id
le
/ m
an
ua
l n
ot
ch
d
ow
n
F9
En
gi
ne
c
ool
in
g f
an
/ m
anu
al
n
ot
ch u
p
F1
0
R
ai
l w
hee
l c
lac
k (
onl
y
m
ov
ing
)
F1
1
Tra
ct
io
n a
ir c
om
pre
ss
or
F1
2
C
hang
e d
ies
el
p
rim
e m
ov
er
(
2-
ty
pes
)
F1
3
sh
ort
a
ir re
le
as
e
F1
4
C
ou
pl
in
g c
ras
h
F1
5
A
ir p
um
p
F1
6
A
ss
oc
ia
ted l
oc
o
so
un
d
F1
7
fla
nge noi
se
F1
8
C
hang
e b
el
l t
ype
(
us
e
F1
to
tu
rn
of
f be
ll af
te
r
adj
us
tm
en
t)
F1
9
H
or
n t
ype
s
el
ec
t
F2
0
R
ev
er
se
G
ear
F2
1
C
ha
nge
be
ll v
ol
um
e (
us
e F
1 t
o
tu
rn
of
f b
el
l a
ft
er
ad
ju
st
m
ent
)
F2
2
C
han
ge
hor
n v
ol
um
e
F2
3
C
han
ge d
ies
el
r
um
bl
e
vo
lu
m
e
F2
4
C
ou
pl
in
g
F2
5
ai
r r
el
eas
e
F2
6
flan
ge noi
se
F2
7
A
ir h
os
e f
iri
ng
F2
8
sh
or
t ai
r r
el
eas
e
C
V
R
e
g
ist
er
D
escr
ip
ti
o
n
R
a
n
g
e
D
e
fa
u
lt
CV
1
R
1
S
hor
t addr
es
s
1
-127
3
--
-
R
6
P
age num
ber
--
-
--
-
C
V
29
R5
B
a
s
ic
c
o
nf
igur
at
ion
--
-
2
CV
7
R
7
M
a
nuf
ac
tu
re
r v
e
rs
ion num
ber
--
-
32
CV
8
R
8
M
anuf
ac
tu
re
r I
D
--
-
143
C
V
17
--
-
Long
addr
es
s
upper
by
te
192-
2
3
1
192
C
V
18
--
-
Long addr
es
s
lo
w
e
r
b
yt
e
0-
255
3
C
V
19
--
-
A
dv
anc
ed c
ons
is
t addr
es
s
0
-127
0
C
V
50
--
-
H
or
n t
ype
0-
16
4
C
V
51
--
-
H
or
n v
o
lum
e
0-
3
3
C
V
52
--
-
B
ell
ty
pe
0-
6
3
C
V
53
--
-
B
el
l v
o
lu
m
e
0-
7
3
C
V
54
--
-
B
el
l r
ing
ra
te
0-
50
3
C
V
55
--
-
D
ies
e
l r
u
m
b
le v
o
lu
m
e
0-
3
3
C
V
56
--
-
B
ra
ke
s
queal
v
o
lum
e
0-
3
3
C
V
57
--
-
D
ynam
ic
br
ak
e
vo
lu
m
e
0-
3
3
C
V
58
--
-
A
ir
r
e
lea
s
e v
o
lum
e
0-
3
3
C
V
59
--
-
A
ir
pum
p v
o
lu
m
e
0-
3
3
C
V
60
--
-
S
af
et
y
pop v
a
lv
e v
o
lum
e
0-
3
3
C
V
61
--
-
E
ngine c
ool
ing f
an
vo
lum
e
0-
3
3
C
V
62
--
-
C
oupl
ing v
o
lu
m
e
0-
3
3
C
V
63
--
-
R
andom
noi
s
e
v
o
lu
m
e
0-
3
3
C
V
64
--
-
R
ail
wheel
c
lac
k
0
-3
3
CV
105
--
-
U
s
e
r ident
ifi
cat
ion num
ber
0-
255
0
CV
106
--
-
U
s
e
r ident
ifi
cat
ion num
ber
0-
255
0
CV
112
Random
noi
s
e
enable
0
-1
1
CV
113
--
-
C
oupl
ing f
ir
e
v
o
lum
e
0-
3
3
CV
114
--
-
b
ra
ke
r
e
leas
e
v
o
lu
m
e
s
ee
char
t
0
CV
115
--
-
A
ut
o br
ak
e s
queal
enabl
e/
dis
abl
e
0
-1
1(
enable
CV
116
--
-
C
oupl
ing
s
ound t
ype
0-
2,
0=
of
f
1
CV
120
R3
A
cc
e
ler
a
tion
0-
32
0
CV
121
R4
D
e
ce
ler
a
tion
0-
32
0
D
ies
el
not
ch
m
ode,
0=
aut
o-
not
ch
3=
m
an
ual
no
tc
h
CV
123
--
-
P
ri
m
e
m
o
ve
r s
ound (
2
-
ty
pes
)
0
-1
0
CV
125
--
-
Fa
ct
or
y def
aul
t s
et
ting:
P
rog
ra
m
m
ing t
o 1
w
ill
re
st
or
e a
ll
C
V
's
to
d
ef
au
lt s
et
tin
g
---
0
CV
122
--
-
0
-3
0
0
CV
2
1
--
-
W
hen C
V
21=
0,
al
l ac
ce
ss
or
y
func
tio
ns
w
ill
fo
llo
w
it
s ow
n
addr
es
s.
W
hen
C
V
21
=1
, al
l
func
tio
ns
w
ill f
ol
low
the c
ons
is
t addr
es
s
---
