McCURDY CS9100 User manual
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Section
2
3
4
5
6
7
Figure
1-1
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-
INSTRUCTIONS
CS9100
lOxlO
INTERCOM
SYSTEM
INDEX
Subject
Genera
1
Des
cr i
pt
i on
Specifications
lnstal
lat
ion
Operation
Ma
i.ntenance
Parts
List
System
Drawings
LI
ST
OF
ILLUSTRATIONS
Title
BCD
Control
Wiring
McCURDY RADIO INDUSTRIES
LI
MITED
108 CARNFORTH ROAD,
TORONTO
,
ONTARIO
M4A 2L4
(416) 751-6262, TELEX 06-963533,
T\/1/X
610-492-1373
McCURDY
RAD
IO INDUSTRIES IN
C.
1711 CARMEN DRIVE, ELK GROVE
VILLAGE
, ILLINOIS 60007,
(312) 640-7077,
T\/1/X
910-222-0436
Page
4
8
9
.
11
12
13
14
Page
7
Issue
2
October
1977,
Page 1
of
13
Mccurdy
Radio Industries reserves the right, without notice to make such changes
in
equipment, design, specifications,
or
components
as progress in engineering or manufacturing techniques may warrant
to
improve the performance
of
the product.
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www.SteamPoweredRadio.Com
cs9100
Instructions
Section
1
GENERAL
DESCRIPTION
Section
1
1.01
to
1.12
1.01 The CS9100 is a
complete
10
input,
10
output
(10 x 10)
intercom
system
with
the
reliability
and
flexibility
to
fill
the
majority
of
requirements
for
professional
use.
1.02
All
switching
is
done
by
sol
id
state
crosspoints
with
balanced
inputs
and
outputs.
1.03
The
intercom
system
includes
ten
input
amplifier
and
matrix
modules,
five
dual
output
amplifiers,
and a power
supply
mo~nted in a
single
19
inch
equipment
frame.
1.04
All
inputs,
outputs
and
controls
are
connected
to
the
intercom
system
via
50-pin
subminiature
'D'
connectors
mounted
on
the
rear
of
the
equipment
frame.
1.
05
Key
panels,
microphones
and
speakers
can be
supplied,
as
extra-cost
options
,
by
Mccurdy Radio
Industries
to
complete
the
system
.
Prea
m
plifier
1.06
The preamp]
if
i
er
and a 1 x
10
switching
matrix
are
mounted
on
a
common
printed
circuit
board.
See AP176, AP276, AP376,
AP476
manual
for
a
detailed
description.
1
.07
The preamp]
ifier
incorporates
an
AGC
amplifier,
which
may
be
switched
in
or
out
by
m
eans
of
a
plug-in
jumper
on
the
PC
board.
1
.08
Three
inputs,
carbon
microphone,
dynamic microphone and
line,
are
provided
.
These
can be
se
l
ected
by
means
of
a
rotary
switch
mounted
directly
on
the
PC
board.
1
.09
The preamp]
ifier
output
is
routed
to
the
edge
connector
before
being
fed
to
the
matri
x
section
to
allow
for
the
insertion
of
auxiliary
equipment
(jackfields
,
etc.)
.
Switching
Matrix
1.10
The
switching
matrix
determines
the
audio
routing
from
the
l
nput
to
the
desired
output,
as
shown
on
the
Audio
Functional
Diagram,
Figure
7-2
.
1.
11
Each
printed
circuit
board
contains
a 1 x
10
(one
input
to
ten
output)
switching
mat r
ix
along
with
the
input
and
AGC
amp
l
ifiers.
1.
12
At
each
crosspoint
of
the
matrix,
w
here
communication
is
desired,
a
sol
id-
state
integrated
c i
rcuit
switch
is
installed
. The
switch
is
activated
by
the
application
of
a
-4V
DC
control
voltage,
via
a key
panel,
to
the
proper
control
pin
(or
pins)
.
Page 4
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CS9100
Instructions
Section
1.13
to
1.22
1.
13
The
crosspoints
may
be
controlled
by
one
of
two
methods:
1.
14
(a)
Discrete
control,
where
the
control
voltage
is
applie
d
to
one
pin
which
activates
the
desired
cross
p
oint,
ten
wir
es
for
ten
crosspoints.
(b)
BCD
(Binary
Coded Decimal)
contro
l,
where
the
control
voltage
is
applied,
in
BCD
code,
to
the
control
pins.
A
BCD
to
decimal
decoder,
on
the
circuit
board,
then
activates
the
desired
crosspoint.
Four ·
control
wires
can
control
up
to
ten
crosspoints.
Isolation
in
the
switching
mat
rix
is
maintained
by
resistors
and a
virtual
ground summing
amplifier.
which
are
on
when
the
crosspoint
is
not
aciivated,
on
the
isolation
resistors.
means
of
the
isolating
The
FET
switches,
maintain
back-loading
Output
Amplifiers
1.15
Several
output
amplifier
configurations
are
available.
Some
types
having
a O
dBm
and +
18
dBm
line
output
only,
and
others
having
a
3W,
8
ohm
output
in
addition
to
the
line
output.
In
addition,
some
types
have
output
transformers,
providing
isolated
8
ohm
and 150
or
600
ohm
outputs
,
while
other
types
do
not.
See
AM178,
AM278, AM378,
AM378T,
AM379,
AM478,
AM478T,
AM479
manual
for
a
detailed
description.
1.
16
All
output
amplifiers
incorporate
a summing
amplifier
input
and O
dBm
and
+18
dBm
outputs
whose
levels
are
independent
of
the
front
panel
gain
control
sett
ing.
1.
17
All
output
amplifiers
with
a
three
watt
output
stage
incorporate
a
sol
id-
state
FET
switching
circuit
for
muting.
By
grounding
the
proper
control
pin
(or
connecting
to
-4V
DC)
the
output
may
be
totally
muted
or
reduced
in
level
by
15
dB
(adjustable
O
dB
to
approximately
30
dB).
1.
18
The
three
watt
output
stage,
on
amplifiers
so
equipped,
is
fully
protected
against
overloads
or
short
circuits.
Power Supply
1.19
One
PS852
or
PS852A
power
supply
provides
±15
volts
DC
at
2A
, which
is
sufficient
to
operate
all
amplifiers
and
switching
circuits
in
the
intercom.
1.20
In
order
to
reduce
the
turn-on
current
surge,
power
is
fed
to
output
amplifiers
AM7
through
AM
lO
via
a
delay
circuit.
This
circuit
delays
the
application
of
power
to
these
output
amplifiers
for
a few
seconds,
giving
the
rest
of
the
intercom
system
time
to
stabilize.
1.21 Where
the
PS852
is
used ,
the
RT613
delay
circuit
is
used.
The
PS852A
has
this
circuit
built-in.
1.22
The
±15
volt
DC
supply
is
reduced
to
±4
volts
DC
by
a CS9000-4
sub-
regulator
.
This
voltage
is
used
to
operate
the
switching
and
control
circuits.
Page 5
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CS9100
Instructions
Section
1
1.23
to
1.
32
Options
1.23
External
Circuit
Drivers
The
external
circuit
drivers,
when
wired,
provide
an
electronic
switch,
for
the
control
of
lamps
or
relays,
which
closes
to
ground
when
the
cross-
point
is
activated.
One
electronic
switch,
consisting
of
an open
collector
transistor
shunted
by
a
diode,
is
provided
per
crosspoint.
See
AP176
-
AP476
,
XP177
-
XP477
instructions
for
full
specifications.
1
.24
BCD
(Binary
Coded Decimal)
Crosspoint
Control
As
previously
described
in
section
1.13
(b),
the
BCD
control
system
al
lo
ws
ten
crosspoints
to
be
control]ed
with
only
four
control
leads.
See
AP176
-AP476,
XP177
-
XP477
instructions
for
a more
detailed
description.
Also,
see
Figure
1-1
for
line
encoding
information.
1
.25
Output
Muting
The
output
m
uting
circuit,
when
w
ired,
provides
for
remote muting
of
the
three
w
att
o
utput
as
described
in
paragraph
1.
17.
For
details
on
adjustment
of
the
partial
muting,
see
AM178, AM278,
AM378,
AM378T,
AM379,
AM478,
AM
478T,
AM479
manual.
Optional
Equipm
ent
1
.26
CP7101
or
CP7102
Control
Panel
Each
panel
contains
five
lever
keys and
is
designed
for
flush
mounting
in a
desk
t op. The keys
are
three
position
(centre
off)
and
may
be
locking
(LJ,
non-locking
(NL),
or
L-NL.
1.
27
CS9000-2
Control
Pa
n
el
This
panel
contains
up
to
ten
lever
keys and
is
designed
for
flush
mounting
in a
desk
t op. The keys
are
three
position
(centre
off)
and
may
be
locking
(L),
non-locking
(NL)
or
L-NL:
It
is
designed
to
be used
with
BCD
control
and
con{ains
a
circuit
board
for
mounting
the
encoding
diodes.
1.
28
SA601
Speaker
The
SA601
is
an 8
ohm
enclosed
speaker;
with
volume
control,
designed
for
placement
on
a
desk.
Mechanical
Details
1.29
The
interco
m
system
is
com
pletely
contained
in a
single
5¾
inch
high,
equipment
frame.
This
frame mounts in a
standard
19
inch
equipment
rack
.
1
.30
Al
1
connections,
both
audio
and
control,
are
made
by
cables
to
standard
50
pin
subminiature
1
0
1
connectors
on
the
rear
of
the
intercom
frame.
No
direct
solder
connections
are
required.
1.31 The
input
am
plifier
and
matri
x modul es and
output
amplifiers
are
built
on
glass-
e
po
xy
printed
circuit
cards
attached
to
metal
guide
plates.
Circuit
connections
are
made
by
a
72
pin
card
edge
connector.
1.32 The
po
we
r s
up
p
ly
is
contai
ned in an
enclosed,
ventilated,
chassis
which
is
mounted in
the
intercom
frame
as
a
plug-in
unit.
Circuit
connections
are
ma
de
by
a
24
pin
''blue
ribbon"
connector.
Pa
ge 6
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CS9100
Instructions
Section
1
1.31
to
1.33
1
.32
The
±4
volt
sub-regulator
is
built
on
a
glass-epoxy
printed
circuit
card
which
plugs
into
a
15
pin
edge
connector
located
behind
the
frame
rear
panel.
The
circuit
card
is
retained
in
the
connector
by
a
sponge
rubber
pad
on
the
inside
surface
of
the
hinged
rear
panel.
1.33 The
relay
timer
is
built
on
a
glass-epoxy
printed
circuit
card
mounted
to
the
rear
of
the
frame,
beh ind
the
rear
panel,
with
brackets
and a
mounting
plate.
BCD
Control
Lines
8
Matrix
Board
Pins
,
Units
31
Matri x
Boa
rd
Pins,
Tens
32
Cable
Connector,
Units
20
Cable Connecto
r,
Tens
24
Table
1:
Pin
Connections
BCD
Control
8 4
0 0 0
1 0 0
2 0 0
3 0 0
Decim
al
Number
4 0 1
5 0 1
6 0 1
7 0 1
8 1 0
9 1 0
Table
2 :
Truth
Tabl e
4
33
34
21
25
Lines
2 1
0 0
0 1
1 0
1 1
0 0
0 1
1 0
1 1
0 0
0 1
2
35
36
22
26
1
37
38
23
27
0
Indicates
the
control
I
ine
pulled
do
w
n.
Connected
to
-4V
control.
Indicates
control
1
ine
pulled
up. Not
connected
to
-4V
control
.
Figur
e
1-1:
BCD
C
ont
rol
\./iring
Page 7
www.SteamPoweredRadio.Com
CS9100
Instructions
Section
2.
SPECIFICATIONS
Section
2
2.01
to2.11
2.01
Input
levels
and
source
impedances w
ith
AGC
section
bypassed:
(a)
AP176
-
AP476
input
amplifiers
l.
Dynamic Microphone:
-60
dBm,
150
ohms
nominal
2.
Carbon Microphone:
-25
dBm,
50
ohms
nominal
3.
Line:
0
dBm,
600 ohms.
(b)
OL76
input
amplifier
1. Dynamic
Microphone:
-60
dBm,
150
ohms
nominal
2.
Li
ne One:
-10
dBm,
600
ohms
3.
Line
Two:
+8
dBm,
600 ohms.
2.02
Maximum
output
levels
and
load
impedances
(Output
Amplifier):
(a) +18
dBm
and O
dBm,
600
ohms
(b) 3
watts,
8
ohms
(c) 3
watt
s (+35
dBm)
600 ohms,
strappable
to
150
ohms
with
two
splits
on
AM478T,
w
liich
has
output
transformers.
2.
03
Input
levels
w
ith
A
GC
section
inserted,
dynamic
microphone
input,
nominal:
(a)
-70
dBm
to
-60
dBm,
Li~ear
gain
\b)
-60
dBm
to
-40
dB
m, 2
dB
c
ha
nge
at
output.
2.04
Frequenc
y
Response:
±2
dB
, 1
00
Hz
to
10
kHz.
2.05
Distortion
(a)
AM
478
1%
maximum, 100
Hz
to
10
kHz,
at
rated
output
level
(b)
AM478T
1% maximum, 150
Hz
to
10
kHz,
at
rated
output
1
eve
l.
2.06
Equivalent
input
noise
(dynamic
microphone):
Better
than
-115
dBm.
2.07
Crosstal
k:
Better
than
55
dB
below +18
dBm,
100
Hz
to
10
kHz,
at
test
level.
2.
08
E
xt
ernal
circuit
drivers:
Maximum
vo l
tage
:
40
volts
Max
imum
current:
75
mA.
2.09
Power
Requirement
:
117
volts
AC,
50/60
Hz
(230
volts
supplied
on
request),
approx.
105
VA.
2.
10
Weight:
Approximately
40
lb.
2.11
Dimensions:
19
11
w
x Sl''H x 1
6~
11
D.
P
age
8
www.SteamPoweredRadio.Com
CS9100
Instructions
Section
3
INSTALLATION
Mounting
Section
3
3.01
to
3.
07
3.01 The
intercom
is
designed
to
be mounted in a
standard
19
inch
equipment
rack,
taking
5¼
inches
of
panel
space.
3.02
Normally,
the
intercom
is
shipped
with
all
modules in
place
and
held
by
means
of
shipping
bars.
These
bars
may
be removed
after
installation
is
completed.
If
unusual
shipping
conditions
necessitate
removing and
packing
modules
separately,
install
the
modules in
the
correct
slots
by
referring
to
the
designations
on
the
module
guide
plates
and
matching
these
with
the
numbers on
the
frame
layout
diagram,
Figure
7-1.
Wiring
Connections
3
.03
All
wiring
is
d
one
to
50
pin
subminiature
1
D
1
con
nectors
mounted
on
the
intercom
rear
panel.
See
Figure
7-3
. Each
of
the
ten
connectors
contains
all
the
audio
and
control
co
nnections
for
a
particular
station.
See
Figure
7-3
for
the
connections
necessary
in
fabricating
the
cables.
3.04
Wiring
should
be
segregated
according
to
level
and
function;
i.e.
aud io
inputs
(microphone
or
1
ine),
audio
outputs
(speaker
or
1
ine)
and
DC
control.
DO
NOT
lace
together
pairs
of
more
than
30
dB
difference
in
level.
3.05
In
order
to
prevent
degradation
of
the
crosstalk,
adjacent
input
amp!
ifiers
should
not
be
assigned
so
as
to
have
input
levels
differing
by
more
than
45
dB.
In
other
wor
ds,
an
input
amplifier
set
for
1
ine
input
(0
dBm)
should
not
be
next
to
one
set
for
dynamic
microphone
input
(-60
dBm).
3.06
Audio
input
wiring
should
consist
of
shielded
twisted
pairs
such
as
Mccurdy SA12002 (22
gauge,
stranded),
while
the
output
wiring,
for
3
watt
outputs
,
should
be Belden 8790 (18
gauge,
stranded).
Ground
the
shields
only
at
the
common
-s
ystem ground
pins
on
the
cable
connector.
3.07
Control
Panel
The
standard
control
panel
for
the
intercom
is
a Mccurdy CP7102
using
five
3-position
lever
keys
with
2C
contacts.
A
wiring
diagram
is
supplied
with
the
panel.
Please
read
the
notes
on
the
diagram
which
refer
to
various
wiring
configurations
pertaining
to
the
types
of
keys
installed.
Where
extra
contacts
are
required
for
external
muting,
order
the
optional
CP7101
key panel
with
3-position
4C
keys.
When
the
optional
BCD
cross-
point
control
is
utilized,
the
CS9000-2 key
panel
must be
used.
This
panel
is
supplied
with
up
to
ten
3-pos
it
ion 1
ever
keys.
Refer
to
the
notes
on
the
diagram
supplied
with
this
panel
for
the
proper
wiring
connections.
Page 9
www.SteamPoweredRadio.Com
cs9100
Instructions
3.08 Grounding
Section
3
3.08
to
3.09
System ground and
chassis
ground
are
tied
together
by
a
jumper
attached
to
TBl, 3, 4 & 5 and
the
intercom
chassis.
In
some
systems,
it
may
improve
the
noise
figure
to
separate
these
grounds
by
removing
the
jumper and
connecting
a
10
gauge,
stranded,
insulated
wire
from TB1, 3,
4 & 5 to
station
ground.
3.09
AC
power
is
obtained
by
plugging
the
intercom
power
cord
into
a
117
volt,
60 Hz,
single
phase,
three
wire
source.
Pa
ge
10
www.SteamPoweredRadio.Com
CS91OO
Instructions
Section
4
OPERATION
Section
4
4.01
to
4.02
4.01
To
turn
on
the
intercom
system,
move
the
power
switch
on
the
power
supply
to
the
1
on
1
position.
The
two
indicator
lamps
should
1
ight,
showing
that
±15
volts
is
present
at
the
output
of
the
power
supply.
4.02
The
control
panel
switches
should
be
designated
to
identify
the
stations
that
can be
called.
Move
the
switch
up
or
down,
as
applicable,
to
cal
l
a
station
by
means
of
the
microphone.
Page
11
www.SteamPoweredRadio.Com
CS9100
Instructions
Section
5
5.
01
to
5.05
Section
5
MAINTENANCE
5.01 Very
little
maintenance
should
be
required
for
the
intercom
on a
system
basis,
except
to
keep
the
equipment
clean
and
free
from
dust.
Regular
inspections
should
be
carried
out
in
this
regard.
At
the
same
time,
com
ponents
and
wiring
should
be
checked
for
any
signs
of
deterioration.
5.02
The
amplifiers
and power
supply
may
be removed
for
bench
testing
or
replacement.
Do
not
remove
or
replace
units
when
the
power
is
applied
.
For
service
and
test
data,
refer
to
the
individual
instructions
for
these
units.
5.03
The
intercom
rear
panel
is
hinged
to
provide
access
to
co
mpone
nts
and
w1r1ng
at
the
rear
of
the
fra
m
e.
To
lower
the
pane},
remove
the
two
scre
ws in
the
upper
left
and
right
corners
of
the
panel.
5.04
The
majority
of
connections
on
both
the
printed
circuit
card
conn~ctors
and
rear
panel
connectors
are
Wire-Wrapped.
Special
wire
is
used
for
this
application.
If
another
type
w
ire
is
used
for
repair
or
other
reasons,
the
connections
mu
st
be
soldered,
even
if
applied
with
the
proper
Wire-Wrap
equipment.
5.05
An
EM906-1
ex
tender
module
is
supplied
with
the
CS9100
to
enable
the
modules
to
be
tested
and
adjusted
whi
le
operating
in
the
system.
An
extender
mo
dule
with
a metal
guide
and
PC
card
support,
the
EM906M-1,
a
nd
one
wit
h
test
turrets
on
the
PC
board,
the
EM906-2,
are
available
as
accessories
at
ex
tra
cost.
Page 12
www.SteamPoweredRadio.Com
CS9100
Instructions
Section
6
PARTS
LIST
Reference
Designation
APl
-
AP10
AM1
-
AMS
±4V
Regulator
Power Supply
Relay Timer
J1
-J15
J16
J17
Pl
-
P10
J1
-J10 (Cable)
Supplier
and
Part
Number
Mccurdy
AP176
Mccurdy
AP276
Mccurdy
AP376
Mccurdy
AP476
Mccurdy
AM278
Mccurdy
AM478
Mccurdy
AM478T
Mccurdy CS9000-4
Mccurdy
PS852
McCurdy
PS852A
Mccurdy
RT613
AMP
530355-8
Amphenol
26-4101-24
Elco 006007-015-940-002
AMP
205740-4
AMP
205817-1
Cannon
DD50P
AMP
205980-1
AMP
205732-1
Mccurdy A852/5-3
Mccurdy A852/5-4
McCurdy
AMRl
-13-4
Mccurdy A9100/5-2
Mccurdy A9100/5-3
GC6261
Section
6
Description
Preamp!
ifier
and
Switching
Matrix
Output
Amplifier
±4V
Regulator
±15V
Power Supply
Relay Timer,
delay
72
pin
PC
Connector
24
pin Power Supply Connector
15
pin
PC
Connector
Panel
Connectors
Pl
-
PlO
Mounting Screws
Cable
Connector
J1
-J10
Safety
Screws
J1
-J10 Cover &
Clamp
J16 Mounting
Plate
J16 Cover
J16 Spacer
J17 Mounting
Plate
RT613
Mounting
Plate
RT613
Brackets
Page
13
www.SteamPoweredRadio.Com
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SC
McCURDY
RADIO
INDUSTm
CS9100
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DIMENSIONS
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10
110
POWER
ANO
INTER
COM
$U
0
PPLY DISTRICI_UTION
D.C. CONTROL .
www.SteamPoweredRadio.Com
DRAWINGS
INSTRUCTIONS
PREAMPLIFIER
&
MATRIX
AP276
&
XP277
INDEX
Preamp]
ifier
&
Matrix
SchematicDiagram
Preamp]
ifier
Schematic Diagram
Preamp]
ifier
Schematic Diagram
Component Layout, Preamp]
ifier
&
Matrix
Component Layout,
Matrix
Board
Connector Wiring
Connector Wiring
D-476/2-1
D-476/2-2
D-476/2-3
c-476/8-1
c-477/8-1
A-276/8-2
A-277/8-2
McCURDY RADIO INDUSTRIES LIMITED
108
CARN
FORTH
ROAD,
TORONTO, ONTARIO M4A
2L4
(416)
751-6262
,
TELEX
06-963533,
TWX
610-492-1373
McCURDY RADIO INDUSTRIES INC.
1711
CARMEN
DRIVE,
ELK
GROVE
VILLAGE, ILLINOIS
60007,
(312)
640-7077,
TWX
910-222-0436
PRELIMINARY
Mccurdy
Rad
io Industries reserves the right, without notice to make such changes in equipment, design, specifications,
or
components
as proqress in
en
gineering or manufacturing techniques may warrant to imp
ro
ve
the performance
of
the product.
www.SteamPoweredRadio.Com
ADDENDUM
TO
ALL
AMPLIFIERS
USING
THE
AGC
AMPLIFIER
EMPLOYING
MOSFET
MFE
3003
(MOTOROLA).
DUE
TO
AVAILABILITY,
SOME
PRODUCTION
RUNS
MAY
NOT
HAVE
MOTOROLA
MFE
3003
FETS
IN
THEM
,
BUT
MAY
BE
REPLACED
BY
INTERS
IL
3N
163.THIS
FET
HAS
THE
SA
ME
CHARACTERIS
T
ICS,
BUT
THE
11
P
IN
OUT
11
IS
DIFFERENT
.
AP176
,276,376,476
AP
6
76
AP175
,
AP195
CP287(287-
1)
TOP
VIEW
TOP
VIEW
McCURDY
RADIO
INDUSTRIES
LIMITED
MOTOROLA
MFE
3003
NOTE:
THE
3N163
is
turned
90
·
CC
W,
and
the
leads
at
t
he
l
ocat
ing
tab
ar
e
reversed.
108 CARNFORTH ROAD. TORONTO. ONTARIO
M4A
2L4 (416) 751-6262,TELEX 06-963533, TWX 610-492-1373
McCURDY
RADIO
INDUSTRIES
INC.
UNITED STATES
HEAD
OFFICE
1711
CARMEN DRIV
E,
ELK GROVE VILLAGE, ILLINOIS
60007
, (312) 640-7077,TWX 910-222-
0436
EAST COAST
OFF
ICE
223 WEST SADDLE
RI
VER
ROAD, SADDLE RIVER, N.J. 07458. (201) 327-
0750
,TWX
710
-988-2254
BUFFA
LO WAREHOUSE
1051 CLINTON STREET, BUFFALO,
N.Y.
14
206, DIRECT LINE TO TORONTO PLANT (716) 854-6700, TWX 610-492-1373
Mc
cur
dy Radio Ind
ustrie
s reserves the right, wi
th
out n
ot
ice
to
make such changes in equ
ipme
nt
,design, spe
cifications,
or
com
pone
nt
s
as
progress
in
engineering
or
manufacturing
techniques
may
warrant
to
improve
the
performance
of
the
product.
www.SteamPoweredRadio.Com
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