RESTRICTED
Section V
PRIMARY
SOURCE
WHITE
(+)
RADIO CONTROL BOX
BC-451-A
28 VOLTS D.C.
(-)
BLA
O
�����
00000
00000
ANTENNA
A-61-A
AN
08-40SCR274-2
-MOUNTING
TEST UNIT I-85-A OF TEST
SE�
RC-55-A
FT-225-A
MODULATOR UNIT
BC-456-A OR (-B)
PLUG
PL-154,
CORD CD-!)24
CONNECT GROUND CLIP TO CHASSIS
Y
RADIO TRANSMITTER
UNDER TEST
SPECIAL PWG
/
AND FIXTURE
DWG. NO.7844
MODIFIED PLUG PL-154
ER DWG.
NO.
7848
C0-5.30
WARNiNG
DYNAMOTOR DM-33-A
GENERATES 600 VOLTS nco
00 NOT ATTACH
OR
DETACH
PLUGS WHILE DYNAMO TOR IS
RUNNING
DANGER
600 VOLTS
PARTS LIST FOR TEST SET RC -55-A
w.E.CO
CONNECTIONS FOR SERVICING RADIO TR
A
NSMIT
T
ERS
(THIS A RRANGEMENT PROVIDES FOR ACCESS
(FOR TESTING COMPONENTS OF TRANSMITTING EQUIPMENT)
D WG.NO.
METER LABELLED
READS
INPUT VOLTAGE
HEATER CIRCUIT
VOLTAGE
SCREEN GRID SUPPLY TO
SCREEN VdL TAGE
TU
:��
L
�l.�
I
�:
I
��&-��
R
PLATE SUPPLY TO
PLATE VOLTAGE
TUBES VT-136,R F POWER
AMPLIFIERS (VOLTS)
OSC.PLATE
PLATE CURRENT TUBE
VT-137
t:
ASTER OSCILLATOR
CURRENT
( ILLIAMPERES)
AMP. PLATE
PLATE CURRENT,
CURRENT
TueES VT-136,RF POWER
AMPLIFIERS (MILLIAMPERES)
AMPERES RF
ANTENNA CURRENT
(ON
ANTENNA A-61-A)
(AMPERES)
TO THE E LE CTRI C AL COMPONENTS INSIDE
THE RADIO TRANSMITTER UNDER TEST)
",,"METER READINGS FOR THE
THREE POSITIONS OF RADIO
CONTROL BOX BC - 451-A
TONE
CW
VOICE
**27.0
**27.0
::f::f27.0
145-160
250-300
145-160
520-560 500-540 520-560
17-22
17-22
17-22
90-110
160-190
90-110
1.7-2.4
2.4-3.3
1.3-2.0
*
RADIO TRANSMITTER MUST BE ACCURATELY TUNED FOR MAXIMUM
ANTENNA CURRENT INTO ANTENNA A-61·A, WITH EMISSION SWITCH
OF
RADIO CONTROL BOX BC-451-A ON CW AND "ANT. COUPLI N G"
A DJUSTED FOR MAXIMUM ANTENNA CURR
t
NT. . RADIO TRANSMITTERS
MUST NOT BE RETUNED AFTER SWITCHING TO TONE OR VOICE.
* *
WITH THE MODULATOR UNIT AND RADIO TRANSMITTER ENERGIZED,
THERE WILL BE APPROXIMATELY ONE VOLT DROP IN THE LEADS
QUAN.
DESCRIPTION
2
CD-524(MOOULATOR UNIT BC-456-A
(-BOR E)TO
lEST
UNI�
1-85-A AND TEST UNIT I-85-A TO RACK FT-234-A,12 qONDUCTOR,
5804
PLUGS PL-154)
I
CD-525 (MODULATOR UNIT BC-456-A
(-B
ORE)TO
PRIMARY
754B
SOURCE, TWO CONDUCTOR,ONE PLUG PL-148 )
CD-526(MODULATOR UNIT BC-456-A
(-B'cOR�)
10
RADIO
CONTROL BOX BC'451-A 18 CONDUCTORS,PLUGS PL-153}
7538
I
CD"'S27(MODULATOR UNIT BC-456-A
(-BOR�)TO RACK
5808
FT-233-4,SIX CONDUCTORS,PLUGS PL-15i)
I
CD-528(RACK FT-234-A TO ANTENNA RELAY UNIT
5810
BC-442-AP�
BC.-44Z.-AM.F1VE CONDunORS.PLU6S
PL-156
I
CD-530(TESl UNIT 1-85-A TO RADIO TRANSMITTER, ONE
MODIFIED PLUG PL- 154 PER DWG.NO.7848 AND ONE SPE-CIA L
7843
PLUG PER D WG.NO.7844)
ANTENNA A-61-A
7777
I
DYNAMOTOR DM-33- A
5168
2
INSTRUCTION DIAGRAMS FOR TEST SETS RC -54-A AND RC -5S-A
E5-692031
I
MODULATOR UNIT BC-456-A
(8 o�R EJ
7591
I
MOUNTING FT- 225-A(FOR MODULATOR UNIT BC-456-A,tB
ORE)
7058
I
MOUNTING FT -228 -A (FOR RADIO CONTROL BOX BC -451-A)
7083
I
MOUNTING FT-22 9-A (FOR ANTENNA RELAY UNIT BC�442�AORAM 7056
I
MOUNTING FT-232-A (FOR RACK FT-234-A)
7061
I
RACK FT- 234-A(FOR ONE TRANSMITTER)
7507
I
RADIO CONTROL BOX BC- 451-A
7095
I
TEST UNIT 1-85-A
7544
I
SET OF TOOLS AS FOLLOWS: 3 -BRISTO WRENCHES
8021
3 -PHILLIPS SCREWDRIVERS
8020
I
T-17 OR EQlIAL
FROM THE PRIMARY SOURCE TO THE POINT OF MEASUREMENT OF THE
HEATER CIRCUIT VOLTAGE AND THE READING ON THE METER LABELED
INPUT VOLTAGE WILL THEREFORE BE ABOUT ONE VOLT LESS THAN
THE VOLTAGE OF THE PRIMARY SOURCE.
*CORDS CO- 524 TO 53 0,INCLUSIVE,·ARE FURNISHED IN FIVE FT.
LENGTHS UNLESS OTHERWISE SPECIFIED.
QMICROPHONE T-17 IS NOT FURNISHED BY WESTERN
ELECTRIC
CO.
AS PART
OF
THIS TEST SE T.
figure 5-2. Test Set RC-55-A -Instruction Diagram for Transmitter Testing
RESTRICTED
5-3-5-4