Sparta 683 User manual
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MOD L
683
SCA GENERATOR
• • I
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T-ECt
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N I
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l. M'A N UA L
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---•
Division
of
Cetec
Corporation
,
•
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5851
Florin-Perkins Road, Sacramento,
Ca
. 95828 •
(916)
383-5353 • Telex 377-488 • Cable
SPARTA
> I -.
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www.SteamPoweredRadio.Com
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~
ELECTRONIC
CO
RPORATION
OPERATING AND SERVICING MANUAL
MODEL
683
SCA
GENERA
TOR
Copyri
ght
SPARTA
ELECTRONIC CORPORATION , 1973
58
51
F
lorin-P
erkins
Road
,
Sacramento
,
California
TELEPHONE: (
916
)
383-5353
TELEX
377-488
CABLE
SPARTA
PRO
PRIETARY
NOTICE;
Sparta
Electronic
Corpor
ation
proprietary
dat
a
is
contain
ed
herein
.
Neither
this
document
nor
the
infor-
matio
n
contained
herein
shall
be
disclosed
to
oth
e
rs
for
manufactur-
in
g
or
any
other
purpose
except
as
authorized
in
writing
by
Sparta
Electronic
Corporation
.
Printed
in
U .S .A.
Pric
e $5 . 00
098-7070-01
October
19
73
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Model
683 Fr
on
t
Matter
Section
I
II
III
IV
V
VI
T
ABLE
of CONTENTS
GENERAL INFORMATION
----------------------
-
---------------
1-
l .
IN
TRODUCTION-----------
----
-------
---------
---
---
----
-
1-
2. GENERAL DESCRIPTION
-----------
-
-----
--------
----
-
--
---
1-2.
l.
Physical
Description
--
--------
-
--------------
---
- -
I
NSTALLATION-------
---
-----------
---
---------
------
-----
----
-
2-l.
INSTALLATION
PLANNING
------
---
---------
-
------------
--
2-1.
1.
Environmental
Requirements----
----
- -
------------
--
2-1
. 2. Power
Requirements--
---
--------------------
-
---
--
2-1,
3 ,
Cooling
Requirements
---------------------------
-
2-2
.
INPUT
AND
OUTPUT
CONNECTIONS
--
- - -
--
-----
---------
-
--
OPERATION---------
.
------------------------------------------
3-l,
OPERATING CONTROLS
AND
I
NDICATORS--------------------
PR1NCIPLES
or
OPERATION------------
-
------
- -
-----
- -
---
-
--
-----
4-l.
INTRODUCTION---
--
--
-
---
-------
---
--
- -
--
----------
-
----
4-2
. GENERATOR
---------------------------------------------
4-3
. POWER SUPPLY
------
---
---------------------------------
MAINTENANCE
---------
--
--
--
- - -
-----
-
--
-
----
-----
--
- -
---------
5-l
, P
ER
I
ODIC
MAINTENANCE----
-
----
-
---------
-
------
----
-
----
5-2
.
ALIGNM
CNT
AND
ADJUSTMENT
------------------------
-
---
5-2
. 1.
Test
Equipment-----------------
-
---------------
--
5-2
. 2. Alignment
Procedure
--
--
--
----
--------
-------
-
----
REPLACEABLE
PARTS--
-
---------
-
--------
-----------------
-
------
6-
l.
ORDERING
INFORMATION
---------------------------------
6-2.
PART
S
LOCATION-------------------------------------
-
--
6-3
. TABLES
or
REPLACEABLE
PARTS
----------------------------
098-7070-01
1- 1
1-1
1-1
1-1
2-1
2-1
2
-1
2-1
2-1
2-1
3
-1
3-1
4
-1
4
-1
4-1
4- 1
5-1
5- 1
5-1
5-1
5-1
6-1
(j-1
6-1
6-1
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Mod
el
683
1-1
INTRODUCl'ION
SECTION I
GENERAL
IN
FORMAT
IO
N
Sectio
n I
Thi
s
manua
l
contains
information
required
to
install,
operate,
and
maintain
the
Sparta
Model
683
SCA
Generator
.
Section
I
describes
the
generator
and
li
s ts
its
specifications
,
Section
n
provides
in
sta
ll
atio
n
instructions
,
Section
I
ll
contains
operating
procedures
and
Section
IV
describes
the
prin
ciples
of
operation
,
Maint
enance
procedures
and
troubleshooting
diagrams
are
contained
In
Section
V
and
r
eplaceable
parts
are
identified
and
listed
in
Section
VI
.
1-2
GENERAL DESCRIPTION
Th
e
Model
683
SCA
Generator
provides
a
signa
l
meeting
the
requirements
of
a
subs
i
diary
communications
authori
za
tion
(SCA)
mode
of
operation
,
Because
of
its
design
,
this
SCA
generator
may
be
used
with
any
Direct-FM
Exciter
1'ype-Accepted
by
the
Federal
Commu
nications
Commission
for
operation
under
part
73
of
the
rules
.
If
t
he
SCA
generator
is
to
be
ope
rat
ed
at
a
frequency
of
67
KHz
simu
l
taneous
ly
with
a
standard
stereo
sign
al
make
certain
the
optiona
l S
KHz
l
ow
pass
f
il
ter
has
been
installed
.
External
muting
is
accomplished
with
a
simp
le
contact
closure
.
This
!unction
is
availab
le
al
terminals
on
th
e
rear
of
the
Unit.
As
supp
li
ed
th
e Modei
683
will
accept
program
and
tel
emetry
signals
.
Fi
ve
front
pane
l
operating
controls
are
provided
-
frequency
adjust
,
output
level,
subca
r
rier
on
-
auto
-
off,
muting
delay
und
power
on-off.
1
-2
. l PHYSICJ\L Df.SCRIPT!ON
The
Model
683
consists
of
a
single
unit
of
standard
rack
panel
construction
.
Physical
charact
e
ristic~
of
t
he
Model
683
are
listed
in
tabl
e
1-1.
Dimensions
:
Weight:
Construction
Style:
Maximum
Altitu
de
:
Maximum
Humidity
:
Connectors:
098
-
7070-01
Tabl
e
1-l
Physic
al
Charaoterlstlcs
3-
1/2"
high
, 10"
deep,
19"
wide
12
Lbs
.
1/
8"
alodin
ed
alum
inu
m w
it
h
pa
int
ed
fr
ont
panel
with
mounting
flang
es
notched
Lo
mate
with
s
tandard
1
9"
equipme
nt r
ack
To
1
2,500
feet
95%
AC-audio
input
Tel
emetry
-
Standard
barrier
strip
Output
-BNC 1'ype (
2)
1- 1
www.SteamPoweredRadio.Com
Section
I
Model
683
Table
1-2
El
ectrica
l
Characteristics
Power
Requirements:
Ambient
Temperature
Range:
Altitude
Range:
Pilot
Frequency
Stability:
Audio
Inpu
t
Impedance
:
Audio
Input
Level
:
Frequency
Response:
Di
stortion
:
Noise:
Subcarrier
Frequencies:
Modulati
on
Method:
Modulation
Capability:
Inj
ectio
n
Range:
Muting:
Muting
Sensitivity:
Muting
Delay:
1
-2
105-125
VAC
,
50/60
Hz,
1
,,
15
Watts
o°F
to
120
°F
To
12,
500
ft
.
!
500
Hz
maximum
600
Ohms,
Balanced
+ 10 dbm
::
2
DB
at
400
Hz
for
100
modulauon
! 2
DB
from
50
Hz
to
7500
Hz
(r
eferred
to
75-use
c
preemphasis
)
< L 5%
at
10%
deviation
(SO
Hz
-
7.
5 KHz)
65
DB
below
15%
deviation
41
KHz
and
67
KHz
Direct
FM
"!:
1
5%
of
subcarrle
r
frequency
(10%
deviation
=
100%
modulation)
0 -
30
%
Selectable
at
front
panel
Subcarrier
gate
opens
at
-10 dbm
at
400
Hz
Adjustable
from O. 6
to
4
seconds
,
nominal
098-7070-0l
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Mode
l 683
2-1
INSTALLATION PLANNING
SECTION
II
INSTALLA
TIO N
Section
ll
Di
mensions
essential
fo
r
pro
per
installation
of
the
Mode
l
683
SCA
Generator
are
show
n
in
Figure
2-1.
2-
1.
1 ENVIRONMENTAL REQUIREMENTS
Locati
on
of
th
e
Mode
l 683
must
be
within
th
e
following
environme
nta
l
limitation
s:
a.
Maxi
mum
altitude:
12,
500
ft.
b,
Max
imum
temperature:
12
0°r
c,
Mi
nimum
temperature
:
oor
d,
Maxim
um
humidity:
95
%
2-1.2
POW
ER
REQUIREMENTS
10
5-12S
VAC,
50/60
Hz
, l
J6
is
required
to
operate
the
Mode
l
683.
Since
this
unit
uses
v
ery
littl
e
power
(1
5
watts)
it
can
remain
p
ermanentl
y
connected
to
the
AC
lin
e
and
l
eft
operational
.
Should
you
desire
to t
urn
it
on
and
off
with
lhe
transmitter
you
shou
ld
allow
at
least
30
seconds
for
the
devi
ce
to
stabilize
before
program
operation
begins.
Sho
uld
it
be
necessary
to
operate
this
equipment
from a
230
volt
sou1
cc
u
se
a
step
-
down
transformer
such
as
a
Triad
N-G8X
.
It
is
important
that
an
auto
-
tran
sformer
.!!Ql_be
u
sed
.
2- 1. 3 COOLING REQUIREMENTS
Wh
en
used
with
the
companion
680
exciter
the
SCA
generator
shou
ld
be
mounted
under
the
exciter.
It
i s
important
that
the
SCA
generator
be
mounted
as
close
to
th
e
exci
t
er
as
p
ossib
le
.
When
used
to
r
etrofit
older
trans
m
itters
it
is
wise
to
l
ocat
e
the
SCA
generator
and
the
exciter
in
a
rack
adjacent
to
th
e
tr
a
nsmitt
er
, Io
this
way
you
can
be
assured
that
th
e
sensit
i
ve
circUitry
with
in
this
equipment
is
k
ept
away
from
the
fields
of
motors,
transf
o
rmers
and
high
current
carrying
conductors
that
might
exist
wit
hin
the
tran
sm1
tler
.,
2
-2
INPUT AND OUTPUT CONNECTIONS
All
input
and
output
connections
fo
r
the
Mode
l
683
a re
made
at
th
e
rear
of
the
unit
and
are
noted
on
fi
gure
2
-1
.
Pri
mary
power
is
connected
to
terminals
J
and
2
of
TB-1.
Remote
control
of
th
e
SC
A m
uti
ng
function
is
accomplished
by
a
contact
cl
osu
re
across
terminals
7
and
8
of
TB-1.
The
audio
frequency
input
connections
a re
terminals
l
and
2
of
TB-1.
The
telemetry
input
connections
are
terminals
Sand
6
of
1'B-1.
098-7070-01
2-1
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Mod
e l
683
SECTION Ill
OPERATION
3-1
OPERATING CONTROLS AND INDICATORS
Section
III
There
are
onl
y
five
front
pan
el
controls
on
the
Model
683
SCA
Generator
-
illustrated
on
the
drawing
below
.
As
supplied
from
the
factory
the
Model
683
is
ready
for
operation
and
once
the
prope
r
power
and
in
put
conn
ections
are
mad
e
it
can
be
placed
into
service
.
Out
put
leve
l
control
(R-3)
should
be
set
for
the
proper
modu
lati
on
l
eve
l
as
Indicated
on
an
approved
moni
tor
. R- 2
will
set
the
frequency
to
the
desired
value
. 1f
automatic
muting
is
desired
the
subcarrie
r
control
switch
S2
should
be
set
to
auto
.
The
SCA
carrier
will
then
tu
rn
on
and
off
as
audio
is
applied
-
the
muting
turn
-
off
time
determ
in
ed
by
the
setting
of
R- 1
(m
uting
delay
).
NOTE :
Telemetry
tones
do
not
have
sufficient
le
ve
l
to
pr
ovide
the
automatic
control
featu
re -
ii
the
SCA
unit
i s u
sed
for
telemetry
only
the
unit
should
be
turned
on
and
off
by
a
re
l
ay
closure
ac
r
oss
the
"enab
le ''
terminals
-
7
and
8
on
TB
-1.
A
co
mplete
setup
procedure
ls
included
in
the
maintenance
section
of
this
manual
.
.S
- 1
T
3
,</t;8
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f=t-L:=!h:::!!:::=========================i==t'==t=@======ll:=L:
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------
-
-----
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-9._00
__
/-;-----,,-
--,--------
.1
RB;;
J
LR/
.'3~
098-7070-01
FRONT
VIBW
-MODEL
683
FIGURE 3- l
3-1
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Mode
l
683
4-
1 INTRO
DUCT
ION
SECTION
IV
PRI
N
CIPLES
OF OPER
ATION
This
section
describes
the
principles
of
operation
of
the
Model
683 SCA
Generator.
4
-2
GENERATOR
CIRCUIT
DI:SCRIPTION
Section
IV
I
nasmuch
as
the
41-KHz
SCA
module
and
th
e
67-KHz
SCA
module
have
similar
circuitry,
th
e lollO't,ling
discu
ssion
applies
equally
to
both
units
.
The
diffe
re
nc
e
table
on
the
schematic
specifies
those
components
used
for
ope
rati
on
at
eithe
r
fr
equency
.
I
ncoming
audio
is
fed
to
a 10
db
r
esistive
pad
that
is
followed
by
transformer
Tl.
The
circuit
board
cont
ains
provision
for
an
optiona
l
5-KHz
low-pass
filter
for
use
with
the
67-KHz
SCA
module
when
t
he
exc
it
er
is
equipped
with
a
stereo
generator.
The
filt
er
conn
ec
ts
to
terminals
20, 21,
and
22,
and
th
e
jumper
shou
ld
be
r
emoved
from
between
terminals
20
and
21 .
The
emitter
circuit
of
Ql
cont
a
ins
the
preemphasis
and
rolloff
networks.
The
75-usec
preemphasi
s
n
etwork
consi
s
ts
of
Rl2
and
C4,
and
high-frequ
e
ncy
rolloff
is
provided
by
the
network
o!
Ll
and
Rl0.
Th
e
preemph
as
is
time
constant
may
be
chang
ed
to
150
usec
by
changing
t
he
value
of
C4
to
O.
33
uF
.
Telem
e
try
ton
es
can
be
inject
ed
into
th
e
emitter
of
Ql
from
termina
ls
on
the
rear
panel
of
the
unit.
Emitt
er
-
follower
Q2
is
used
to
d
riv
e
the
mutin
g
amplifier
and
the
subcarrier
modulated
osclllator.
Modul
at
ed
oscillator
O10-Qll
is
a
free-running
multivibrator,
the
frequency
of
which
is
proportional
to
it
s
bias
voltage
.
Transistor
09
regulate
s
th
e
bias
to
compensate
for
temperature
drift.
The
modulated
osc
ill
at
or
is
fo
ll
owed
by
diode
gate
CRS-CR6,
buffer
amplifier
Q l
2,
and
a
low-pass
filter
which
removes
harmonics
of
the
oscill
a
tor
waveform
.
Th
e
output
of
the
filter
is
f
ed
to
emitter-
follower
013
.
Subcarrier
contro
l
switch
S- 2
is
mounted
on
th
e
front
panel.
This
switch
provides
a
choic
e
of
three
op
erating
condition
s: ON , OFF,
and
J\UTO. Th
ese
designations
relate
to
muting
the
subcarrier
.
In
th
e AUTO
position,
th
e
subcarrie
r
is
automatically
muted
when
there
is
no
aud
io
input
in
to
the
SCA
module.
Th
e
muting
amplifier
composed
of
03
through
08
gates
the
subcarricr
on
with
normal
audio
i
nputs
of
20
db
or
l
ess
below
peak
deviation
capability
, The
subcan1er
remains
on
for
a
short
period
(
no
mina
lly
b
etwee
n
O.
'6
and
4
seconds
)
after
the
audio
in
put
is
removed;
the
duration
of
the
period
ls
adjustable
by
muting
delay
control
R4
l .
4-3
POWER SUPPLY
CIRCUIT
DESCRIPTI
ON
A r
egulated
power
supp
ly
serves
the
DC
power
needs
of
all
stages
.
The
operation
ts
as
follows
-
the
positive
(
+)
input
of
operation
amplifier
4IC1
is
main
t
ained
at
some
iixed
vo
ltage
by
the
action
of
zener
diode
4D5.
Curren
t
flows
out
of
this
amplifier
into
the
b
ase
of
se
ries-pa
ss
tran
s
istor,
401.
This
causes
its
emitter
voltage
to
ri
se
.
The
voltage
will
rise
until
the
negative
(-)
input
of
the
opera
tion
al
amplifier
r
eceives
a
voltage
from 4R3
that
exceeds
the
zene
r
voltage
at
the
positive
(+)
Jnput,
At
t
his
point
th
e l
eve
l s
will
stab
ilize
so
that
ju
s t
enoug
h
current
fl
ows
out
of
tJ1e
operational
amplifier
into
401
to
maintain
tMs
condition
.
Since
th
ere
is
a
grea
t
deal
of
gain
enclosed
within
this
negalivc-feed-
b
ac
k
loop
,
th
e
output
volt
age
will
r
emai
n
very
stable
for
large
changes
in l
oad
curr
e
nt
or
supply
voltages.
The
input
voltag
e
to
this
re
gulator
is
supplied
by
a
conventional
bridge
r
ectifier
a nd
filter
capacitor.
098-7070-01
4-1
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Mo
d
el
683
Section
V
5-1
PERIODIC MAINTENANCE
SE
CTIO
N V
MAINTEN
A
NCE
No
specia
l ma
int
enance
procedures
are
nec
essary,
The
Model
683 SCA
generator
ls
des
i
gned
with
comp
onents
that
should
not
ex
hibit
problems
throughout
the
lif
e
of
the
equipment
.
None
of
th
e
active
d
evices
are
operating
with
parameters
kn01Nn
to
cause
time
-
dependent
fa
ilur
e
modes
,
The
to
p
cover
sh
ou
ld be r
emoved
and
the
dust
blown
out
of
the
generator
using
a
soft
bl
ast
device
such
as
a
vacuum
cleaner
rather
than
an
air
compressor.
Remember
to
re-install
th
e
cover
and
all
screws
after
cl
eaning
.
5- 2 ALIGNMENT AND ADJUSTMEN1' PROCEDURE
If
t
he
SCA
gene
r
ator
requi
res
adjustment
H should
be
performed
only
by
experienced
person
nel
havin
g
an
adequate
understanding
of
the
generator
and
who
are
thorouyhly
familiar
with
the
test
equipm
ent
requi
r
ed
.
5-2
. 1
TEST
EQUIPMCNT
(1)
LOIN
distortion
/\udio
fr
equenc
y
Generator
(2)
Wideband
Oscilloscope
(3)
Accurate
VOM
(
'1)
SCA
Monitor
(5) SHIELDED Audio
leads
for
t
est
conn
ections
(6)
G.
C .
9302
/\ligment
too
l
{7)
l
foot
len
gth
of
RG-58U
cab
le
with
BNC
Connector
s
5-2.
2 ALIGNMENT PROCEDURE
Kr
ohn-Hite
4200
or
equiva
l
ent
T
ektronix
422
or
equiva
l
ent
Si
mpson
260
(1) Remove
the
SCA
Generator
from
th
e
transmitter
, r
emove
the
t
op
cove
r,
and
place
th
e
unit
on
a
test
bench
(2)
Conn
ec
t
117
VAC
to
terminals
to
1
and
2
of
'rB-
1
(3)
Conn
e
ct
wideband
oscilloscope
to
Jl
using
a
I-foot
length
of
coaxial
cable
098-7070-01
5-1
www.SteamPoweredRadio.Com
Section
V
Model
683
S-2
(4)
Set
FREQUENCY
adjust
potentiometer
R2
on
front
pane
l
of
SCA
module
to
mld
-r
ange
position.
(5)
Connect
SCA monit
or
to
J2.
Se
t
subcarrier
control
switch
S2
to
ON .
(6)
Adjust
coarse
freuqency
control
R43
to
pr
oduce
41-KHz
or
67
-KHz
indication,
as
appropriate
,
on
SCA
monitor
.
(7)
Connect
low-distortion
audio
oscillator
to
te
r
minals
1
and
2
of
SCA.
Set
audlo
osclllator
for
400-Hz
output
and
verify
that
an
audio
input
l
eve
l
between
+8
and
+12 dbm
yields
a 10%
frequency
deviation
.
(8)
Set
subcarrier
control
switch
S2
to
AUTO.
Decrease
oscillator
output
to
approximately
-10
dbm
and
verify
muting
function
. Verify
correct
setting
of
MUTING
DELAY
control
Rl
to
ensure
muUng
turnoff
time
between
O. S
and
4
seconds.
(9)
Conn
ect
oscilloscope
to
wiper
termina
l
of
OUTPUT
LEVEL
control
R3
.
Set
subcarrior
control
switch
S2
to
ON
and
verify
that
OUTPUT
LEVEL
control
R-3
produces
variation
of
from 0
to
2
volts
peak-to-peak
(0. 7
volt
rms) .
098-7070-01
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Model
683
SECTION
VI
REPLACE
AB
LE
PARTS
6-1
ORDERING lNfORMATION
Section
VI
When
ordering
parts
for
the
Model
683 SCA
Generator,
give
the
model
number
and
the
serial
number
of
t
he
equipment
and
the
r
efe
rence
designation
and
Sparta
part
numb
er
.
To
order
a
part
not
listed
ln
paragraph
6-3
of
this
section,
give
a
complete
description
of
the
part
including
function
and
l
ocation.
All
parts
should
be
ordered
from:
6-2
PARTS
LOCATION
SPARTA
ELECTRONIC CORPORATION
5851
Florin-Perkins
Road
Sacramento,
California
95828
Telephon
e:
(91
6)
383-5353
Te
l
ex:
377-4
88
Cable
Addr
ess
:
SPARTA
The
location
of
parts
li
sted
in
table
6-2
are
shown
in
figures
6-1
thr
ough
6-3
.
6-3
TABLES
OF REPLACI:Mt:NT
PARTS
A
list
of
manufacturers
of
the
component
parts
of
the
Model
683
is
provided
by
table
G-l.
Table
6-2
contains
a
listing
of
r
ep
l
aceable
parts.
The
manufacturer
of
the
particular
part
listed
in
table
6-2
is
indi
cated
by
a
code
number,
which
is
used
to
identify
the
manufacturer
as
listed
in
table
6
-1.
Code
No
.
00207
01295
02660
03508
04713
07263
09353
11502
12040
13934
187
22
23265
24759
29505
37942
4465S
S6289
71400
71590
71785
72136
72765
73445
80294
81349
098-7070-01
Table
6-1
.
List
o{
Manufacturers
Manufactur
er
Quality
Transformer
Co.
Texas
In
s
truments
Inc.
Amphenol
Corp
.
General
Electrica
l
Semiconductor
M
otorola
S
em
iconductor
fairchild
Semiconductor
C & K
Components
IRC
Divisi
on
of
1'RW
National
Semi
conductor
Mtdwec
Co
rporation
RCA
Corp
. -
Solid
State
Division
Sparta
Electronic
Corporation
Lenox
-
fugle
Electronics
,
Inc
.
Temple
Industries
PR
Mallory
Inc
.
Ohmit
e
Manufacturing
Co
.
Sprague
Clectric
Co.
Bussm
a n
Div.
of
Mc
Graw
-
Edison
Ceotralab
-
Division
of
Globe-Union
Inc
.
Howard
8 .
Jones
-
Chlnch
Division
Electro
Motive
Manufacturing
Co
.
In
c .
Drake
Manufacturing
Co.
Amper
ex
Elect
ronic
Corporation
Bourns
Inc.
Military
Specification
Address
Chica
go
, IL
Dallas,
TX
Broadview
, IL
Syracuse,
N
.J.
Phoenix,
AZ
Mount
ain
View,
CA
Wat
e
rtown,
MA
Boone,
NC
Pla
tt
sburgh
, N.Y.
Osh
kosh
,
NB
Mount
aintop
,
PA
Sacramento,
CA
Watchung,
N.J.
Teoat
e ,
CA
lndi
anapoUs
,
IN
Skoki
e ,
rL
North
/\da
ms,
Ml\
St
.
Louis,
MO
Milw
aukee
, WI
Chicago,
IL
Willimantic,
CT
Harw
oOd
Height
s ,
IL
Hi
cksville
,
LI,
N.
Y.
R1
verside,
CA
6-1
www.SteamPoweredRadio.Com
Section
VI
Tab
le
6-2
.
Replaceable
Parts
List
Desig
Description
Part
No,
Chassis
022-4152
f r
ont
panel
022-4153
Dress
strip
022-4154
Hand
le
022-4086
Cover,
top
022-4155
Cove
r,
bottom
022-4156
Wiring
harness
022-4157
A6Al
Generator
022-1012
A2
Power
supply
022-8050
,
DS-1
Lamp
, 28V
244-0014
F-1
Fuse,
l/2A
Slo-Blo
261-0007
J
-1
Connector
, BNC
287-0034
J- 2
Same
as
J
-1
R-1
P
otentlometer,
lO0K
130
-
0064
R-2
Potentiometer
, lK 1
30-0052
R-3
Same
as
R-2
R-4
Resistor,
·5.
6K,
l/2W,
5%
136-0049
S-1
Switch,
DPDT
299-0011
S-2
Switch
, DPDT
299-0300
T- 1
Transform
e
r,
Power
326-0010
TB-1
Terminal
board
477-0010
XDS-1
Lampholder
244-0003
XF-1
Fuseho
l
der
261-0043
6-2
Mfr
.
23265
23265
23265
23265
23265
23265
23265
23265
23265
72765
71400
02660
446S5
44655
11502
093S3
09353
00207
71785
7276S
71400
Model
683
Mfr
.
Part
No.
Total
022-4152
022-4153
1
022
-
4154
1
022-4086
2
022-4155
022-4156
l
022-4157
1
022
-
1012
l
022-80S0
1
11604
1
MDG
0. 5 1
UG-1094,\/U
2
CLU-1041
1
CLU-1021
2
1
7201PN l
7211H
l
23Kl9C
l
10-164
l
4428-001
HKP
098
-
7070-01
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Model
683
Desig
.
Cl
C2
C3
C4
cs
C6
C7
ca
C9
Cl0
Cll
Cl2
Cl3
Cl4
Cl5
-
Cl6
Cl7
Cl8
(
Cl8
)
Cl9
(
Cl9
)
C20
C21
C22
C23
(C23)
C24
(
C21)
098-7070-01
Table
6-
2.
Replaceable
Parts
List
A
6J\l
G
ene
r
ator
-41KHz (67
KHz)
Description
Part
No
.
Capacitor,
2
.2uf,
35v
104-
0
112
-01
Capacitor,
,005uf,
lkv
110-007
6
-01
Capacitor
,
.O0luf,
lkv
110-02
04
-0l
Capacitor
, .15uf,
100v
105-3226-11
Capacitor,
47uf ,
20v
104-01
26
-01
Capacitor
, l
Suf
,
20v
104-011
9-01
Capacitor
, •
22uf
, lO0v 1
05-3226-12
Capacitor,
•l
uf
, l0Ov
105-3
226-
10
Capacitor
, •
0luf,
lO0v l
10-0006-01
Same
as
C7
Same
as
C6
Same
as
CS
Same
as
C6
Same
as
Cl
Same
as
C6
Same
as
ca
Capacitor
,
820pf
101-0039-01
Capacitor
,
SlOpf
1
01-0034
Same
as
Cl8
Same
as
(Cl8)
Capacitor,
.
0022uf
, 10
0v
105-3
226-20
Sam
e
as
C2
Same
as
C3
Capacitor
, 150
pf
101-0176-01
Capaoilor
120
pf
101
-017
4
-01
Samo
as
Cl8
Capacitor
,
430pf
101-0
031-01
S
ection
VI
Mfr.
Mfr
.
Part
No . Total
23265
3
56289
SHK-D50 4
23265
2
1
3934
E3XFR, .1
5,
5%,
l00v
1
23265
2
23265
5
13934
E3XfR, .
22,
5%, 1
00v
3
13934
E3XFR
,
.I,
5%,
l00v
2
23265
1
72136
DM
15E82
1J
0300WV4CR (j
DM15ESUJO300WV4CR
13934
E3FR, .
0022,
1%, 1
00v
1
72136
DM1
5Fl5
1J
0S00WV4CR l
72136
DM15F121J0500WV4CR 2
72136
DM15E431JO300WV4CR l
6-3
www.SteamPoweredRadio.Com
Section
VI
Table
6-2.
Replaceable
Parts
Llst
(Cont'd)
Desig
.
Desc
r
iption
Pa
rt
No
.
Mfr
.
C25
Capacitor
,
750pf
101
-0038-01
72136
(
C25)
Capacitor
, 4
70pf
101-0032-01
72136
C26-C27
Same
as
Cl8
(
C26-C27
)
Capacitor,
820pf
10
1-
0039
72136
C28
Same
as
C2
C29
Same
as
Cl
C30
Same
as
C2
C31
Same
as
C7
C32-C36
N/A
C37
Same
as
Cl8
(
C37
)
Same
as
C23
C38
Capacitor,
560pf
101-0035
-
01
72136
(
C38
) N
ot
used
CR
1
-CR6
Diode,
1N914
16
1
-0096-0
l
01295
Ll I
nductor,
lmh
186-0094-02
24759
L2 I
nductor.
l0mh
1
86-0094-06
24759
(
L2
)
Inductor,
4 .7mh
186-0094-04
24759
L3
I
nductor,
4 .7mh
186-0094-04
24759
(
L3
) I
nductor
, 3 . 9mh 1
86-0094-03
24759
PCB
PC
Board
065-0935
23265
Ql-Q9
Transistor,
2N2924
1
49-0180-01
03508
Ql0
Transistor,
2N3646
1
49
-0303-
01
07263
Q
ll
Same
as
Ql0
Ql2-Ql3
Same
as
Ql
Rl-R2
Resistor
, 1
50,
10%
,
l/2w
1
36-1128
-
01
81349
R3
Resisto
r,
470,
10%, Vzw
136
-
1140-0
l
81349
6-
4
Model
683
Mfr
.
Part
No
.
Total
DM15C751JO300WV4CR l
DM15E821JO300WV4CR l
DMlSE821JO300WV4CR 2
DM15E561JO300WV4CR
1N914 6
MR-1000 l
MR-10,
000
l
MR-4700
1
MR-4700
MR-3900
1
065-0935
l
2N2924(TO-5)
11
2N3646
2
RC20
Grl5
1K
s
RC20GF471K 5
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7070
-01
I
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M
odel
683
Desig
.
R4-R5
R6
R7
RS
R9
Rl0
Rll
Rl2
Rl3
Rl4
Rl5
Rl6-Rl7
Rl8
Rl9
R20-R21
R22
R23
R
24-R25
R26
R27
R28
R29
R30
R31
R32
R33
098-7070-01
Tabl
e
6-2
.
Replaceable
Parts
Li
st
(Cont'd)
Description
Part
No.
Mfr.
Same
as
Rl
Same
as
R3
Resistor,
180,
10%,
l/2w
136-1130-01
81349
Resistor,
33K,
10%
,
l/2w
136
-
1184-01
81349
Resistor,
4. 7K, 10%,
l/2w
136-1164-01
81349
Resistor,
68
I 10%I
l/2w
136-1120-01
81349
Resistor
,
2.2K,
10%,
l/2w
136-1156-01
81349
Same
as
R3
Resistor,
15K, 10%,
l/2w
136-1176-01
81349
Same
as
R3
Resistor;
100, 10%,
l/2w
136-1124-01
81349
Resistor,
lK, 10%,
I/2w
136-1148
-
01
81349
Resistor,
lOK, 10%,
l/2w
136-1172-01
81349
Resistor
, IO0K, 10%,
1/2w
136-1196-01
81349
Same
as
Rl8
Sam
e
as
Rl6
S
ame
as
Rl9
Sam
e
as
Rl8
Same
as
Rl6
Re
sis
t
or
,
220,
10%,
l/2w
136-1132-01
81349
Same
as
Rl8
Same
as
Rl9
Same
as
R27
Same
as
Rl8
Same
as
R27
Same
as
Rl8
Section
VI
Mfr
.
Part
No.
Total
RC20GF181K ]
RC20GF333K 1
RC20GF472K 7
RC20GF680K 1
RC20GF222K 5
RC20GF153K 1
RC20GF101K 4
RC20GF102K 8
RC20GF103K 16
RC20GFJ04K 6
RC20GF22JK 5
6-5
www.SteamPoweredRadio.Com
Section
VI
Table
6-2
.
Replaceable
Parts
List
(Cont
'd)
Desig.
Description
Part
No.
Mfr
.
R34-R35
Same
as
Rll
R36
Same
as
RlS
R37
Same
as
Rl8
R38
Same
as
R9
R39
Same
as
Rll
R40
Same
as
Rl8
R41-R42
N/A
R43
Resistor,
var.
, l0K
137-0837-01
80294
R44-R45
Same
as
R9
R46
Resistor
,
27K
, 10%,
V2w
136-1182-01
81349
R47
Resistor,
22K, 10%,
l/2w
136-1180-01
81349
R48
Same
as
R27
R49
Same
as
Rl6
RS0
Same
as
R47
RSl
Same
as
Rl6
R52
Same
as
RlS
RS3
Same
as
Rl6
R54
Same
as
Rl
R55-RS6
Same
as
Rl9
H57
Same
as
Rl6
R58
Same
as
R9
R59-R60
Same
as
Rl8
R61
Same
as
R9
R62
Same
as
R47
R63-R64
Same
as
Rl8
R65
Same
as
Rl9
6-6
Model
683
Mfr
.
Part
No
.
Total
3067Pl-103
1
RC20GF273K 1
RC20GF223K 3
-
098-7070-01
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Mod
el
683
Desig
.
R66
R67
R68
R69
R70
R71
R72
R73
R74
R75
R76
R77
Tl
098-7070-01
Table
6-2.
Replaceable
Parts
List
(Cont'd)
Description
P
art
No.
Mfr.
R
esis
tor,
47K,
10%,
1/2w
136-1188
-01
81349
Resistor,
220K, 10%,
1/2w
13
6-
12
04-01
81349
Same
as
R66
Resistor,
3.3K, 1
0%,
1/2w
1
36-
11
60-01
81349
Same
as
R3
Same
as
R27
Same
as
R9
S
ame
as
Rl8
Same
as
RlS
Same
as
Rll
N/A
Samo
as
Rl8
Transformer,
audio
318-0115-02
00207
Section
VI
Mfr.
Part
No.
Total
RC20GF473K 2
RC20GF224K l
RC20GF332K 1
1
6-7
www.SteamPoweredRadio.Com
Section
VI
A-2
Power
Supply
Oesig
.
Description
Part
No.
4
Cl
Capacitor,
1000uf/50v
112-0009
4C2
Capacitor,
.
ooV
l
kv
110-
0013
4
C3
Capacitor
,
250uf/64
v 1
12-0007
40 1
Diode,
S
ilic
on
161-
0007
4
02
Same
as
401
40
3
Same
as
4D1
4
04
Same
as
4D1
4
D5
Diode
,
Zener
, 5 .
lv
/
lv
161-
0022
4I
C-l
In
tegrated
ci
r
cuit
15
0-0003
P
CB
Pri
nt
ed
Circuit
Board
065-80
50
.
4
Q-l
Transistor,
2N5497
149-
0023
4R-l
Resistor,
620
ohms
,
l/2w,
5%
136-0031
4
R-2
Same
as
4R-l
4R-3
Potentiom
eter
, l
OK,
l/4w
130
-0014-02
4
R-
4
Same
as
4R-l
4R-5
Resistor,
4.7K,
l/2w,
5%
136-0047
4
R6
Same
as
4R-S
OPTIONAL ITEM
LPF Low
Pass
filter
(SKHz)
00
1-
7567
6-8
Mfr.
29505
71590
7
3445
01295
04713
12040
23265
18722
11502
37942
11502
23265
Model
683 I
I
Mfr
.
Part
No
.
Total
i
301-1000/50
1 I
DD-102
C437AR/4250
l II
1
N4005
4
11
11
1N4733
l
11
UA741C 1
065-8050
l
11
2N5497
1
3
11
MTL14L4 l
11
2 11
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001-7567
l I
098-7070-01
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