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DEPARTMENT TECHNICAL MANU.4L TM 11-2720
INSTALLATION OF RADIO AND INTERPHÜNE EQUIPMENT IN LIGHT TANKS M5 AND M5Al
RESTRCTD. DISSEMINATION OF RESTRICTED M¿TTER. The inortion c:taed in rected docents and the estial chacterstics of retricted material may be gi to any pc know to be in the aece of the Unite States and to pens of undoubted loyaty and ci who ar copeating in Gornent wok, but will not be CXuiuncate to the public or to the authorid milita public retins agencies. (Se alii pa. 23b, AR 3roS, is Ma...) prs ace by
U.it~å Sttlt~i GO~~r1m~nt Printing Offce 1
W tlinington: 19/4
WAR DEPARTMENT, WASHINGTON 25, D. C., 5 DECEMBER 1944.
TM 11~2720, Installation of Radio and Interphone Equipment in Light
Tanks M5 and M5A1 is published for the information and guidance of all concerned. lAG 30.7 (6 Nav 44)\
By ORDER OF THE SECRETARY OF WAR:
G. C. MARSHALL, Chief of Staff. OFFICIAL:
J. A. ULlO, Major General, The Adjutant General.
AAF (5); AGF (5); ASF (5); AAF C (2); Arm & Sv Bd (2); Def C (2);Tof Opns (5); Base C (5); Tech Sv (2); SvC (5); Area ASvC (2); PC&S (2);
PE (2); Dep 11 (2); Gen Oversea 50S Dep (Sig Sec) (2); GH (2); M ConcC (2); Air Base Hosp (2); Gen Sv Sch (5); Sp Sv Sch (10); USMA (2); ROTC (5); Lab 11 (2); Aig AS (2); Rep Sh 11 (2); A (5); Dept (5); D (2); Bn 2 (2); T /0 & E 2-22 (3); 2-26 (3); 2-27 (3); 7-25; 7-26 (3); 7-29 (3); 11-107 (3); 11-127 (3); 11-237 (3); 11-587 (3); 11-592 (3); 11-597 (3); 17-15; 17-16 (3); 17-17 (3); 17-19 (3); 17-25; 17-26 (3); 17-27 (3); 17-29 (3).
For explanation of symbols, see FM 21-6.
., Paragraph Paie
SE I. GUIDE TO USE OF THIS MANUAL
Purpse. . . 0 . 0' . . , 0 0' 00 . . , . . . , , 0' .0 0 0 , . 0 0 0 0 0 , 0' 0 0 , . , 0 . . . . . 0 . 0 . , . . 1 I Eqùipment . . , , , , . 0 0 , . , , , 0 , , 0 , , . . , , . . 0 . . , 0 . . , , 0 0 0 . , . , 0 0 0 . . , , , , . , ,2 I Holes and brackets. . :0 '0 00 '0" 0 0 .. . 0 ,. .. , . ,. ,0 00 .. ., .. ,. '0" " .. . 3 I Before benning installation, 0 o. 0 , , 0 . , , . , . 0 , . 0 . 0 , " ' 0 0 , , 0 . . 0 . .. . , : , . 4 1 Immediately after
installation 0 0 . . 0 . 0 . 0 . . 0 0 . . , . 0 0 0 . . 0 . . . 0 . . . . . , , 0 . 0 0 5 1
II. IGNITION NOISE SUI'I'RESSION IN LIGHT TANK M5 SERIES.
General. . .. , . . , . 0 0 . . , . . . . . , 0 . 0 , 0 . 0 . .. . 0 . . . . . 0 . 0 . , . . 0 . , . . . 6 2 Procure, 0 .. . . . . . . . . . . , . . 0 , 0 , . , 0 , . . . . . 0 . . . . . . , . . . . . . 0 . 0 . 0 0 0 . 0 , . 7 2
III. ItADIO SET SCR-245-.
Required parts.. . . . . . . .. . 0 . . . . . . 0 . , . , , . . , , , , , , , 00, 0 , , , , , 0 , , , , . 0 0 , ,8 3 Assmbly and instlation 0 0 . . .0 , 0 , 0 , . 0 , , 0 . 0 . . 0 , , 0 . , , . 0 , , . , . 0 . 0 . . , ,9 4
LV, ItADIO SET SCR-50 ). Required parts o. , , , 0 , . 0 0 , , 0 . 0" , . . . . 0 0" 0 . , . . . . , . 0 0 , . , . , 0 . 0 0 . . , 0 . .. 10 6
Assmbly and installation 0 . . 0 , 0 . . 0 , 0 , , 0 , . 0 , 0 . , , 0 , , , , . , , , , , , . , . , , ,,11 7
V. ItADIO SET SCR-SOI-( ) OR SCR-521-( )',
Required part,. . . . , . . . , , . 0 , , 0 0 , 0 . . 0 , . , . . 0 , 0 . . , . . . . . . , . . .' . . . , . . 0 12 9 ' .-\ssembly and installation. . 0 , 0 , , . , . , . . . 0 0 , 0 , 0 . . , 0 , . , , 0 0 , . , 0 0 . . . . .. B 10 Vi. ItADIO SET AN!VRC-3-( ).
Required part 0' . , , . . . . , . , . 0 , . . . , , , 0 , , . . . , . . . . .' " . 0 . , , , , . . , , , . . . 14 12 Assembly and installation. , , , ~ . . . . 0 . . . 0 , 0 , , , . , 0 , . , , . , 0 0 0 0 , , . . , . . . . 15 12
VII. INRI'HONE EQUII'MENT ASSOCA TED WITH RADIO SET SCR-SOI-( ) OR
SCR-521-( ). Required pas o. o. 0 , 0 0 0 , 0 . 0 . . 0 . . , . , . , 0 , . 0 0 . , 0 0 0 . . , , , , , . , 0 0 , , .', 0 0 0 16 15 Assbly
and installation. . '00' ,. " 0 0000. ,. '.00.' 00' 00.00.0. . .00.0 17 15
WHY - To prevent the enemy from using or salvaging this equipment for his benefit.
WHEN-When ordered by your commander. axes, pickaxes, hammers, crowbars,
HOW- 1. Smash-Use sledges, axes, hand
heavy tools. 2. Cut-Use axes, handaxes, machetes.
3. Burn-Use gasoline, kerosene, oil, flame throwers, incendiary grenades.
4. Explosives-Use firearms, grenades, TNT.
5. Disposal-Bury in slit trenches, fox holes, other holes. Throw in streams. Scatter. USE ANYTHING IMMEDIATELY , AVAILABLE FOR DESTRUCTION OF THIS EQUIPMENT
WHAT-l. Smash-All vacuum tubes, crystals, control dials, coupling coils, transformers, speakers in the receivers, external loudspeakers,
microphones, headsets, dynamotors, and cable connectors. 2. Cut-All connecting wires, cording, and cabling.
3. Burn-All equipment, and all associated training, technical, and installation manuals. 4. Bury or scatter-All remains, after destroying their usefulness.
THIS EQUIPMENT USES HIGH VOLTAGES WHICH ARE DANGEROUS TO LIFE. OBSERVE ALL SAFETY PRECAUTIONS.
1. MAKE NO ADJUSTMENT WITH THE POWER SWITCH ON. 2. DO NOT OPERATE THE .EQUIPMENT WITH THE SHIELDS REMOVED.
3. DO NOT CONNECT POWER TO ANY UNIT OF THE RADIO SET UNTIL OPERATING INSTRUCTIONS HAVE BEEN READ COMPLETELY.
SECTION I "
GUIDE TO USE OF THIS MANUAL
" 1. Purpose ~
appropriate figure for complete drillng data. In
This manual provides methods and procedures,
sary, consult these figures before driling. Do not
based upon actual field experience, for installation of radio and interphone equipment in Light Tank M5 series. Items required to make a complete operating installation are listed for each radio set and interphone equipment. Offcial nomenclature fol-
lmn:d by empty parentheses, such as Headset HS-3O-( ), is used to indicate any model of equipment regardless of its procurement. 2. Equipment
Installations coyered include the following radio sets:
SCR-245-li SCR-508-( ) AN /VRC-3-( )
SCR-506-( ), SCR-528-( ) 3. Holes and Brackets
The preliminary preparation of Light Tank M5
the event relocation of holes appears to be neces-
change kole line-up on any radio part imless absolutely necessary. Specific instructions for any par-
ticular part of these installations are included in
the section devoted to that installation. Figures 3 and 12 show the mounting holes used for the various radio sets installed in Light Tank M5. 4. Before Beginning Installation .
Ilustrations, installation methods, and any subsequent changes to this manual must be studied carefully before an installation is made. Caution: Light Tank M5 series has a 12-volt electrical system. Before installng any radio set or interphone equipment covered in this manual, be sure that it is designed for a 12-volt installation, and that 12-volt dynamotors have been supplied.
S. Immediately After Installation
At the completion of the installation, a thorough operating check must be made to determine \V hether
the equipment has been installed properly and whether it is in working order.
for installation of radio and interphone equipment consists of the necessary drillng of the vehicle, the location and spacing of certain holes and bolts, and the mounting of the terminal box complete with
CautiOti: Do not operate any of the radio or interphone equipment until the instruction book
battery and interphone connections. Normally,
or technical manual, covering the specific radio set
these preparations wil have ben completed before deliyery of the vehicle. Should any vehicle
or interphone equipment, has been studied careful\y. Otherwise, damage to the equipment may
arriye undrilled, reference must be made to the
IGNITION NOISE SUPPRESSION IN LIGHT TANK MS SERIES
Intermittent,' clicking Generator regulator.
An electncal noise suppression system has been installed in Light Tank MS senes by the manufacturer. The type of suppression installed in this senes is usually called the filter suppre5r, bypas capacitor, and shielding system. For a detailed descnption of this suppression system. se the
technical manual.furnished by the manufacturer for each vehicle. Normally, little trouble is expenenced with this system. However, should a case
anse where excessive ignition or other electncal noise is encountered, locate the source of the noise and take steps toward eliminating it. Use the following procedure. 7. Procedure
sound; lingers for several seconds when ignition is turned off.
Whining sound; vanes with Generator. speed of engine; ceases
only when generator stops
rotating. . Sparking, or con tin uous Brushes and commu-
crackling noise. tator of generator. d., Noises from other electncal components and circuits of the vehicle, such as panel gauges, heater fans; and, in turreted vehicles, traversing motors and gyrostabilzers, wil generally fall into one or
the detailed operating instructions contained in
more of the above categones. To identify noises emanating from them, these auxilanes may be
the technica manual of the radio set. Place the
turned on and off individually.
radio set in operation, set the receiver sensitivity control at maxmum, and tune the receiver slowly over the entire range of frequencies to be utilized
e. If the source of interference cannot be found by any of the preceding methods, connect a probe
for communication. Listen to the reeiver output with a headset.
antenna (fig. 31) to the antenna terminal of the radio set. Slowly move the loop of the probe an-
a. Complete the radio installation and study
tenna over the vanous parts of the vehicle's elec-
b. When the frequency or frequencies of great-
tncal system. Keep the loop close to, but not in ,
est noise level have been found, leave the receiver
contact with, the part being examined. Interfer-
tuned to one of these frequencies and shut off the vehicle engine. Observe to what degree the noise
ence-producing parts should be heard in the
has subsided. That part of the noise which subsides
when the vehicle engine is shut off, is caused by the engine's ignition system. That part of the noise
which stil persists is picked up from sources other than the vehicle's ignition system.
c. Start the vehicle engine again. Adjust re ceiver sensitivity control to a point where the engine noise can be most readily distinguished from the static, etc. Proceed to identify the engine
noise by reference to the following table:
Interene Usua Source Popping sound; corresponds Ignition system.
parts. Examine and tighten all suppressr and shielding components, and all connections and grounding bonds. Clean the surfaces under them. This wil assure goo electncal con tact between wires and terminals, and between metal casings
and the frame of the vehicles. (Insulated but ungrounded metal parts absorb and reradiate elec-
tnca noise.) ., g. If interference persists, supprer components should be checked by substituting new ones.
to ignition finng; acceler-
If a replacemtnt is not available, disconnect the
ates when engine is raced;
suspected component, and test capacitors, resis-
stops when engine is
tors, and chokes within it for opens, shorts, or other faults.
turned off. 2
f. Intèrference generally can be eliminated by cleaning, tightening, or rep'lacing noise-producing
RADIO SET SCR~245-U
8. Required Parts
Items necessary for installation of Radio Set SCR-245-U in Light Tank M5 series are listed below:
Box BX-19, for receiver spare tubes. Box BX-20, for transmitter spare tube. Box BX-21, for Boxes BX-19, BX-20, headsets, etc. 1 Cas CS-S6, for trasmitter tuning unit. 1 Chest set TD-4. 1 1 each 2Z26S1-421 to-24, incl. Clamps MC-421 to MC-424 inclusive, for mat setions. Cord CD-307-A 6S-inch, for Headset H5-3O-( ). 3EI307-S.S 1 2Z1119 2Z1120 2Z1121 2Z1SS6 4B417
1 1 1
1 1 1
3E131S 3E1426 3E13SS 3E21SSA 3E1604 2Z3367 2Z337S 3H13S7 2Z33S6
Cord CD-318 for Microphone T-3O-( ).
Cryta Holder FT-171-( ), with crstal. Dymotor Unit PE-SS, includes Mounting FT-18S.
3HiSSS 6LSo-24SV14 2BSOO16
2BS30 3GS98 3Z344S 2A2087 2A2349 2A23S0 2A23S1 2A23S2 2A23S3 2BI64S 2B1630 2Z6712 2Z6718 2C4312 2C6223 2Z80S6 2CS017 2CS018
'I 1 1
1 1 1 1
1 1 1
Cord CD-26 connects Radio Transmitter BC-223-( ) to Dynamòtor Unit PE-S5. Cord CD-355, connects Radio Reciver BC-312-( ) to Radio Transmitter BC-223-( ).
Cord Co-I88-A, plnnecs Dynotor Unit PE-55 to terminal box. Cord CD-, 6-inch, for Headset H5-3O-( ). Cover B~7, for mast bas. Cove BG-7S, for Radio Recver BC-312-( ).
Cover BG-77, for Dynotor Unit PE-55. Cove BG-6, for Radio Transmitter BC-223-( ). Hardware bag.
Headset H-16/U or H5-3O-( ), Insulator IN-98. for antenna lead-in Wire W-12S. Key 1-4S. Mast Bas MP-37.
Mast Seion MS-9. Mast Seion M5-50. Mast Seion M5-S 1.
Mast Seion M5-52. Mast Seion M5-S3.
Micrphone T-4S or T-3O-( ). Mounting FT-172, snubber for Radio Transmitter BC-223-( ). Mounting FT-178, snubber for Radio Reciver BC-312-( ).
Radio Reciver BC-312-( ). includes Mounting FT-162.
Radio Transmitter BC-223-( ), includes calibration chart and Mounting FT-I73. Roll BG-S6-A, for mat seions, Transmitter Tuning Unit TU-17-( ). Transmitter Tuning Unit TU-I8-( ),
'Cryii Holder FT-l71. FT-171-A. or FT-I71-B may be uo.
'Hea HS23 may be -ibsttute for Heat H-16/U or HS-3G( ). (Cord CD- is not required.) "Mut Hu MP-ll. MP-ll-A. or MP-S7 may be substute for Ma Hu MP-37. 'The ae numbers and order Dumbe of th cabroD ch an of Tratte T~nii Units TU-17-( ) and TU-l8-( ). mus aire with thos
of :R Tratte. BC-223 ).
9. Assembly and Installaton a. LOCATION AND ASSEMBLY OF COMPONENTS. CompOnents of the radio set (fig. 6) should be installed as follows (figs. 3 and 19'for bracket details): ' , lIe/hod a ru materals
Part and loca#01
Mast Base MP-31, in hole provided in roof of right spOnsen (figs 1 and 6).
Install mast base through hole in roof of right spOnsen by assembling the necesary washers and insulator setions as follows: Place item lover hole in sponsen. Place item 2
over item 1. Place item 3 over item 2. Insert item 4 through hole. Place item 5 over item 6 and insert through
bottom of hole in sponsen. Place items 7 and 8 beneath item 6 and fasten entire assembly in place with items 9 and
10. See figure 6 for termination of antenna lead before cutting wire.
Fasten to pads shown in figure 3, with screws and washers provided.
Mounting FT-162, on floor of right
Seure to sponsen with screws and stopnuts provided. (See
sponsen, left side.
Mounting FT-173, on floor of right sponson, center.
Secure to sponson with screws and stopnuts provided. (See fig 6.)
Mounting FT-18S, on floor of right spOnson, right side.
Secure to sponson with screws and stopnuts provided. (See fig. 6.)
Remove receiver from receiver cabinet and drill cabinet as
Replace the reeiver in its cabinet. Cut a slot in top of cover
shown in figure 4. Install Mounting FT-118 as shown in figure 5. (See also fig. 6.)
to admit item 1 (fig. 5), and place over receiver cabinet. before completing asembly of Mounting FT -178, as shown in figure 6.
Radio Receiver BC-312-( ing FT-162.
), on Mount- Place receiver on Mounting FT-162, tighten thumbscrews,
and lock in place with the snap-slide catches. Remove the tuning unit from the transmitter. While using the small reinforcing plate as a template, drill side of trans-
Install Mounting FT -172 as shown in mitter cabinet. figures 5 and 6: Replace the tuning unit. Cover BG-86.
Cut a slot in top of cover to admit item 1 (fig. 5), and place over transmitter cabinet before completing the assembly of Mounting IT-l72, as shown in figure 6.
Radio Trasmitter BC-223-( ), on
Place the transmitter on Mounting FT -113 and lock in pOsi-
Mounting FT-173. Calibration chart.
tion with snap-slide fasteners.
To be earned in side poket of transmitter or mounted in Some convement loction by drillng small holes in comers and securing with machine screws.
Dynamotor Unit PE-SS, on Mounting FT-18S (fig. 6). 4
Place dynamotor on mounting and lock II position with snap-slide fasteners.
Method and mateias
Part snd Jlfation
Place cover over Dynamotor Unit PE-5S.
Transmitter Tuning Units TU-17-( )
One tuning ~nit carried in transmitter. Unit net in use to
, and TU-18-( ).
be carried in Case C5-56.
Disposition left to discretion of using arms.
Mast Sections MS-49 to M5-53 and
Screw mast sections together and fasten with clamps. Carr in Roll BG-56-A, when not in use.
Clamps MC-421 to MC-424 on Mast Base MP-37.
For mast setions and clamps when not in use. Disposition
left to discretion of using arms.' Cover Bc-7.
Place cover over mast base when mast sections are not in use. (See fig. 6,)
Box BX-19 and Box BX-20.
Disposition left to discretion of using arms. Stow in Box
Disposition left to discretion of using arms.
Headset H5-30-( ).
Plug Cord CD-307 into jack of Radio Receiver BC-312-( ) Plug Cord CD-604 into Cord CD-307 and connect Head-
BX-21, when not in use, if Box BX-21 is carred in the
set HS-30-( ) to Cord CD-604. Microphone T -30-( ) and Key 1-45.
Plug the cords attached to Microphone T -30-( ) and Key 1-45 to the proper jacks in Radio Receiver BC-312-( ).
HolderFT-171-( ),withcrystal. Carred in Transmitter Tuning Unit TU-17-( ) or TU 18-( ), according to frequency designated on Bolder.
Wire W-128, and screws, nuts, etc.
Stow any excess material remaining in Box BX-21 after completion of installation.
Headset H-16/U, Microphone T-45,
and Chest Set TD-4.
Use in place of Headset H5-30-( ), Microphone T-30-( ). and associated cording, when available.
b. COROI:'G A:-Ð WIRING. (1) CorEl and wire Radio Set SCR-245-U as shòwn in figure 6. Hand tighten the plug locks on the various cords. Do not
the dynamotor housing. If necessary, it is permissible to modify the dynamotor end of this cord by
removing excess length of leads. The terminals
use any tool to tighten these plug locks. Suffcient
must be resoldered to the leads before coml'leting
slack should be left in the cording and wiring con-
the electrical connections.
'nections to permit free motion of all units having
(3) Make the antenna and ground connections,
shock mountings. Follow tke color coding specified.
using Wire W-128 as shown in figure 6. The ground
(2) Do not connect the + 12-volt and -12volt leads of Cord Co-188-A, connecting Dynamotor Unit PE-55 and the battery terminal block
should be as short as possible. Exercise care to insure good electrical connections. All wires should be solder-tinned.
connections from the transmitter and the receiver
(in the terminal box), until all other connections
have been completed. This procedure wil prevent
accidental shorts of the battery. When installng ,Cord CO-188-A at the dynamotor end, it may be necessary to ream the entrance hole provided in
(4) Connect and drape all cords so that they wil not interfere with the accessibility and operation of the radio equipment. Clamps to hold radio cordage are shown in figure 25. 5
RADIO SET SCR-S06-( ) 10. Required Parts
Items necessary for installation of Radio Set SCR-506-( ) in Light Tank M5 series are listed below: Quantity
Item Antenna A-27, phantom.
2A275-27 2Z1250 2Z2599-263
Chest Set TD-.
Bracket, for Antenna A-27, phantom. Chest CH-263.
1 each 2Z2651-421 to-424, inel, Clamps MC-421 to MC-424, inclusive. 2
3E1307-5,5 3E1604 3E1314
Cord CD-04, 6-inch, for Headset HS-3O-( ). Cord CD-318, for Microphone T-3O-( ).
Dynamotor DM-4( ), 12 volts.
Connector No. 61007 and Bondnut BL-50, Cord CD-307-A, 65~inch, for Headse HS-3O-( ). Cord CD-314, for loudspeker L5-3,
Cover B~7. for Mast Base MP-37. Dynamotor 011-42-( ), 12 volts. Headset H-16/U or HS-3O-( ).
2 1 1
21 1 1
1 1 1
6L5o-506V4 3G598 3Z3445 2Z6303.1 2A2087 2A2349 2A2350 2A2351 2A2352 2A2353
281645 281617 281630 281567 2Z6721-253 2C4452
Hardware bag. Insulator IN-98. Key J-45.
Loudspeke LS3. Mast Bas MP-37 or MP-57. Mast Setion 115-9.
Mast Setion MS-50. Mast Seion 115-51. Mast Seion 115-52. Mast Setion 115-53.
Microphone T-45 or T-11. Microphone T-3o- ).
Microphone Cover 11-367, for Microphone T-45. Mounting FT-253, including Cord Co-280.
Radio Reciver BC-652-( ), includes crstal unit. set of tube, and spare parts. Radio Transmitter BC-653- ), includes set of tube and spare parts. Roll BG-56-A, for mast seions.
Switch Box BC-658-( ). " ' Wire W-I46, for antenna and grund leads.
'Hea HS-18 ma be substitute for Headset HS-30( ). (Cord CD- is not require.) H.,cb H-Ió/U shul be ua wh avale 'Mas Ba MP-S7 or MP-Il ma be subatitute for Mas Ba MP-37.
'Micphne T-17 ma be subotute for Mlcphii T-JO. (Cord C~311l is DO reui) Miphii T-& shul be ua wb aYB
11. Assembly and Installation
Components of the radio set (figs. 10 and 11) should a. LoATION AND ASSEMBLY OF COMPONENTS. be installed as follows (figs. 3 and 19 for bracket details); Method and mateias
Part and location
Mast B~se MP-37 or MP-57 (fig. 1), in hole provided in roof of right sponson.
Install mast base th~ough hole in roof of sponson by insert-
ing the necessary washers and insulator setions as follows: Place item lover hole in sponson. Place item 2 over
item 1. Place item 3 over item 2. Insert item 4 through hole. Place item 5 over item 6 and insert through hole
from inside the sponson. Place items 7 and 8 beneath item 6, and fasten entire assembly in place with items 9
and 10. See figure 10 for termination of antenna lead
before cutting wire.
Insulator IN-98, on mounting pads, ceiling of right sponson.
Fasten to pads with screws and washers provided, as shown
Dynamotor DM-4o-( ), in crystal fre-
If the dynamotor is furnished uninstalled, install it in the
in figure 10.
quency control unit of Radio Receiver
crystal frequency control unit. The four snap fasteners
accessible from the top of the crystal frequency control
unit are used to hold the dynamotor in place. All connections to the dynamotor are made by Bexible leads term-
inating in Plug P-250. Installation of proper dynamotor automatically adjusts the receiver circuits for correct op-
erating voltage. The nameplate on the front panel of the receiver should be turned to read 12-VOLTS OPERA-
Dynamotor DM-42-( ), in Radio Transmitter BC-653-( ).
If the dynamotor is not already installed, install it in Radio Transmitter BC-653-( ) by plugging into provided jacks and clamping in place. Before placing the radio set in op-
eration, see that links on the right side of the transmitter are in proper places for 12-volt operation. If they are not,
remove the top of Radio Transmitter BC-653-( ), and connect the six links in the 12-volt position as indicated by the arrow on edge of terminal strip. The outer side of the voltage indicator plate, above the dynamotor's red
pilot light, should read 12 VOLTS.
Mounting FT -253-( ), in right sponson.
of sponson with hardware provided. To avoid noisy reception while the vehicle is in motion, the feet of
Fasten to Boor
Mounting FT -253-( ) must make good electrical contact with the vehicle. The surface upon which thefeet of
the mounting rest, must be cleaned thoroughly with
emery cloth or sandpaper before the mounting is bolted in
place. Where the radio mounting shelf is not welded to the vehicle, the surfaces under the heads of all mounting to insure good electrical contact bolts must be cleaned' between mounting shelf and vehicle frame.
Radio Transmitter BC-653-( ), on Mounting FT-253-( ).
Place on Mounting FT-253 (fig. 10), and secure in place by tightening provided wingnuts. 7
Part and ~ Radio Receiver BC-652-( ), on Mount-
ing FT-253-( ). Switch, Box BC-658-( ), on bracket, extreme front of right sponson. (See
Metho and ma Place on Mounting FT-253 (fig. 10), and seure in place by tightening pro~ded wingnuts. Fasten to bracket with screws ánd washers provided. Con-
nect the attached cords as shown in figure 1 i.
Headset H5-3Q-( ) and Microphone
T-3Q-( ), orT-17, and Key 1-45. Mast Sections MS-9 to M5-53 inclusive, Clamps MC-421 to MC-424 inclusive, on Mast Base MP-37. Cover BG-67.
Loudspeaker L5-3 and Cord CD-314.
Plug into properly designated cords and jacks, as shown in figure i 1.
Place clamps over mast section joints to prevent loss of tipper sections. When not in use, carr mast sections.and
clamps in Roll BG-56-A. Place over mast base when mast sections are removed. Disposition left to discretion of using arms.
If use of these items is desired, connect them together and plug into properly designated jack on front panel of
Radio Receiver BC-652-( ). Headset H-16/U, Microphone T-45,
and Chest Set TD-4.
Use in place of Headset H5-30-( ), Microphone T-3Q-( ) or T -17, and associated cording, when available.
Antenna A-27, phantom.
Locate and weld bracket (fig. 32) securely to front edge of transmission housing, as shown in figure 33.
Store in any convenient location.
b. CORDING AND WIRING. Cord and wire Radio Set SCR-506-( ) as shown in figure 11. Leave suff-
cient slack in all cording and wiring to permit free motion of all units having shock mountings. Do not connect the positive and negative 12-volt leads in the terminal'box until all other connections have been made, thus preventing accidental short-circuiting of the car storage battery.
RADIO SET SCR-508-(
) OR SCR-528-( )
1 ~ Require Parts
Items necessary for installation of Radio Set SCR-508~( ) or SCR-528-( ) in Light Tank M5 series are listed below:,
Radio Set SCR-528-(
4B417-4 2Z2599264 2Z2651-423 3E1307 A-5.5
3H1634 3Hl63S 6LSo-S08V4
Clamps MC-423 and MC-424, for mast seions, Cord CD-307-A, 65-inch, for headset. connecting Headset H5-3O-( ) to Cord CD-307-A. Cord CD~04, 6-inch, for Connector No. 61007 and Bondnut BL-50, for power cable connection, Cover BG-I08, for Mast Base MP-48. Dynaotor DM-34-( Dynmotor DM-35-(
), 12 volts, includes attached spare pars. ). 12 volts, includes attached spare pa.
Hose, rubbe, garden, % inch 1.0.
Antenna A~2, phantom, Bracket for Antenna A~2. Chest Set TD-4. Chest CH-264.
Hardware bag. Headset H-16/U or H5-3O-( ).
Insulator IN-iot Mast Base MP-48 or MP-4A.
2.\2351 2.\2352 2.-2353 2A2416 2Bl645 2B1617
Mast Setion M5-S i. Mast Setion M5-52, Mast Setion M5-53. ,
Mast Setion M5-116,
Microphone T-45 or T-17,
Microphone Cover M-367.
), including Cord C0-278 to power terminal box, and
necesry mounting bolts, locknuts, etc.
Radio Receiver BC~03-( ), including one set of tube installed. Radio Transmitter BC-604( ), including one set of tubes and necessary -
Roll BG-56-A, for antenna mast setions. Wire W-128; 2 feet required for Antenna A~2,
IHeadit HS-18 may repla Heat H-16lU or HS-3G-( ), When this is done. Cord CD- is not us.
'Microphone T-io( ) may repla Micophone T-45 or T-17. When this Íl done. Cord CD-318. ÓJtrol cord for MicrophoneT-3G-( ). must be
"Dynaotor DM-34( ) and Dyotor DM-35-( ) may alredy be instaed in Rao Reve BC~( land Rao Tratte BC~( ), respevely.
13. Assembly and Installaton
a. LOCATION AND ASSEMBLY OF COMPONENTS. Components of Radio Set SCR-508-( ) or SCR-
528-( ) (figs. 2, 7, and 9) should be installed in Light Tank;M5 as follows (figs. 3 and 19 for bracket
Part and loum
Metho and ma
Mounting FT -237-( ), including Cord
Fasten to floor of sponson with 8 mounting screws ~"-
C0-278, in left sponson.
Mast Base MP-48 or MP-48-A, in holè provided in roof of left sponson.
24 x 1%", nuts, and washers provided. (See fig. 2.) Install mast base through hole in roof of left sponson in the following sequence as shown in figure 8: Place item 1
through hole in sponson. Place item '2 over item 1 urider-
in place with item 3. Place item 4 over item 1 and tighten firmly with item 5. Mast Base MP-48 is designed so that three modes of lead-in connections are possible: coa:.¡ial cord; Wire W-128, internal; Wire W-128, external. Wire W-128, internal, must be used in this installation as follows: Cut antenna lead-in Wire W-128 to proper .length and strip 72-inch of the insulation from one end; clean and tin this end and solder tip, item 6B, to it as shown in figure 8. Loosen setscrews 8 and 9. Remove assembly 7 and install neath (inside sponson) and tighten'
the wire inside the mast base, through hollow stem, item
I, making certain that metallc tip, item 6B, is inserted in the slot as far as possible. Tighten setscrews 8 and 9.
This step should be made before mast base is installed through hole in coof of sponson. After mast base is installed and tightened, insulator 6C, neoprene washer 6D, 'and insulator 6E are slipped over Wire W-128 and installed inside hollow stem, item 1. Follow up with washer, item 17, and retaining collar, item 18. Suffcient slack wire must be provided inside stem, item 1, to allow for flexing of mast base. For Mast Base MP-48-A, see figure 20.
Dynamotor DM-34-( ), in cabinet of Radio Receiver BC-603-( ). (Two Dynamotors DM-34-( ) and two Radio Receivers BC-603-( ) required for Radio Set SCR-508-( ).) Dynamotor DM-35-( ), in cabinet of Radio Transmitter BC-604-( ).
In cae Dynamotor DM-34-( ) is not already installed in receiver, install it as follows: Remove chassis from receiver cabinet by loosening screw lock in rear center of cabinet. Dynamotor unit is installed on top rear of receiver chassis by means of four bolts in- its base.
If dynamotor is not already installed in the transmitter, install it as follows: Remove crystal case from transmitter cabinet by loosening the two screw locks on front panel and pullng crystal case out. Loosen the four screw locks holding cover on, top of transmitter and remove cover.
Dynamotor unit, is installed in left rear of transmitter chassis by means uf rour bolts in its base.
Radio Transmitter BC-604-( ), including necessary crystals, on Mount-
ing FT-237-( ). BC-60J-( ),onMountReceiver ing FT-237-( ). (Two Radio Re-
ceivers BC-603-( ) required for Radio Set SCR-508-( ).) 10
Mount in position as shown in figure 2 by means of thumbscrew locking devices.
Mount in position as shown in figure 2 by means of thumbscrew locking devices.
Metho and mateias
Part and loatio
Place over Mast Base MP-48 when equipment is not in use.
Headset H5-3O-( ).
Use Cords CD-604 and CD-307-A to connect headset to jack in Radio Receiver BC-603-( ).
Microphone T-17 or T-3Q-( ).
Insert plug of cord in microphone jack of Radio Transmitter BC-604-( ).
Mast Setions M5-S1, M5-52, and M5-
Screw mast sections together and, after placing clamps over
53; Clamps MC-423 and MC-424.
joints, screw into mast base. When removed, stow mast , setions in Roll BG-56-A.
Roll BG-56-A. .
Disposition left to the discretion of using arms.
Headset H-16/U, MiGrophone T-45.
Use in place of Headset H5-3Q-( ), Microphone T -30-( or T-17, and associated cording, when available.
and Chest Set TD-. Antenna A-62, phantom, and bracket.
Se position 3, figure 34. Attach phantom antenna to bracket
as shown. Remove two screws and lockwashers from left front comer of Mounting FT -237-( ), ~nd secure bracket
with antenna attached to mounting with original Jockwashers and hardware provided with bracket. '\Tire W-128, for Antenna A-62, phantom. Disconnect standard antenna lead-in from antenna binding post on transmitter and connect one end of 2-foot length
of Wire W-128 to this binding post. Remove cover from antenna and connect other end of wire to antenna binding post marked ANT. Fasten ground clamp securely to tip
of bracket. . Chest CH-264.
When used with Radio Set SCR-508-( ), store in any convenient location. When used with Radio Set SCR-528( ), install on Mounting FT -237-( ) in vacant space
between Radio Transmitter BC-604-( ) and Radio Receiver BC-603-( ). Not/!. The above procure applies to the installation of Radio Set SCR-508-( ) or SCR-328-( ) in left s~nson of Light Tank MS. For loction of Radio Set SCR-508-( ) or SCR-528-( ) in turret of Light Tank 1\5Al, se figures 14,15, 16, and
17. :\ssmbly of components is similar to above procedure. ,
Rubber hose, to prevent damage to Mast
Section M5-53, caused by mast section striking edge of hatch door of Light Tank M5A1.
Loosen two- setscrews on Clamp MC-424 at joint of Mast Sections M5-53 and MS-S2. Remove clamp. Unscrew
two mast sections. Pass 8-inch length of hose over and down on Mast Section M5-53 to a position just above Mast Base MP-48 and where mast section is protected by hose when mast sways and strikes open hatch door.
.b. CORDING AND WIRING. Cord and wire this radio set as shown in figure 7 (fig. 15 for Light Tank
M5A1). Suffcient slack should be left in all cording and wiring at Mounting FT-237-( ) to permit fre motion of the shock mountings. Install Cord CQ-278 connecting Mounting FT-237-( ) and the battery terminal strip in the car terminal box after all other connections have been completed. This
procedure wil prevent accidental shorts of the battery.
RADIO SET AN/VR~~-( )
14. Required Parts
Items necessary for installation of Radio Set ANjVRC-3-( ) in Light Tank MS series are listed below. Quatity 1
Antenna AN-13O-A. Batter BA-70.
Bracket. (Se fig. 19(C).) Bracket. (Se fig. 19(A).) Bracket. (Se fig. 19(B).)
Cas CS-128-( ). Radio Receiver and Transmitter BC-l00A. Transformer C-410, to be attached to Switchbox BC~58-( ). Cover BG-108, for Mast Bas MP-48-A. Hardwae. Handset TS-1S-( ), with Cord CD-94.
Mast Bas MP-48-Aor MP-4.
2A2353 2Z6721-250 2Z9050 2C7978
Mast Setion MS-53, includes one spare. Mounting FT-25O-( ).
Strap ST -SO.
Switch Box BC~58-( ).
TM 1l~37, for Radio Set ANjVRC-J-( ). Wire W-128.
.Transformer C-410 may be obtained from Cord CD- or CO-. if it is not available sepately.
15. Assembly and Installation
Components of Radio Set ANjVRC-.l-(
should be installed as follows (figs. 3 and 19 for bracket,
details) : Part and location
."lethod and mate
Ammunition rack and periscope box, on right sponson.
Remove the .30 caliber ammunition rack from right sponson to provide room for the radio set. Remove periscope box on sponson to provide access to all mounting locations. Replace periscope box when installation has been completed.
Mounting FT-2So-( ), and brackets
Seure brackets (fig. 19(C) ) to Mounting FT-2So-( ) with two hex. head machine screws, nuts, and lockwashers, as
shown in figures 19A and 19C.
shown in figure 18. Secure brackets (fig. 19(A) ) to bottom
of Mounting FT-2So-( ), using 4 hex. head machine screws, ~'-20 x ~' with hex. nuts and lockwashers.'
Insert. two hex~iieacl machine screws upward through
holes in Mounting FT-2So-( ), and secure with nuts and washers as shown in detail A, figure 18. Place Mount-
ing FT -2So-( ) in position on right sponson; in place of the .30 caliber ammtinition rack, and secure to sponson by means of screws and nuts removed from ammunition rack, placing the screws upward through the sponson, as shown in detail C, figure 18., 12
Metho and maJ
Part and loatio
Radio Receiver and Transmitter
BC-l000-A and Battery BA-70.
Install' Battery BA-70 in Cas CS-128-( ) of Radio Receiver and
Transmitter BC-l000-A. Place Radio Re-
ceiver and Transmitter BC-I00~A on Mounting FT250-( ) and secure to brackets (fig. 19(e) ) with two hex. head machine,screws, ~ir-20 x ~ir, nuts, and lockwashers, as shown in figure 18. Place bracket (fig. 19(B) )
over receiver-transmitter, and secure to Mounting FT -250-( ) as shown in detail A, figure 18.
Switchbox BC-658-( ) (figs. 21 and 24) and Trasformer C-410.
Before Switch Box BC-658-( ) is installed in the vehicle, Transformer C-410, part of Cord C0-04, must be in-
serted in series with the headset patch cord on the RADIO side of the box. If a separate Transformer C-410 is not available, a complete Cord CD-604 may be used by reversing connections to Transformer C-410. Terminals 1 and 2, on Transformer C-410, marked" headset," wil be used for connection to the radio set, and terminals 3 and 4, marked" cord," wil be used to ,connect
the cord from Switchhox BC-658-( . ). Open the case of the Transformer C-410 (detail D, fig. 18) by removing four brass screws in the flat side of case. Disconnect the 6-inch cord from terminals 3 and 4 (cord terminals) of the transformer. Place the 6-inch cord on oppoite end of transformer, and connect terminal lugs of cord to terminals 1 and 2. Remove Plug PL-540 from the end of Cord
C0-604. Remove the Plug PL-55 from headset patch cord on the RADIO side of Switch Box BC-658-( ). Place Plug PL-55 on end of Cord C0-04, in place of Plug PL-540. Solder Terminal TM-163 to ends of headset patch cord on Switch Box BC-658-( ) and connect Termi~al TM-163 to terminals 3 and 4 on Transformer C-410. Replace cover and screws on cas of Transformer C-410. If Transformer C-410 is supplied separately, cut headset patch cord from Switch Box BC-658-( ), prepare tips of cordage, solder Terminal TM-163 to tips, and connect as shown in figure 18. Mount Switch Box BC658-( ) on bracket (fig. 26) beside the codriver's Interphone Control Box BC-606-( ), with provided hardware. Figure 18 shows the location of switch box on two types of mounting brackets supplied in Light Tanks M5 series. Route the patch cords on the RADIO side of switch box
to Radio Receiver and Transmitter BC-l000-A, as shown in figure 18. Insert Plug PL-68 into microphone jack on panel and Plug PL-55, on Cord CD-604, into phone No.1 jack.
MetW and mt
Part and locit
Mast Base MP-48-A or MP-48, on top plate of right sponson.
Se figure 20 for assembly of Mast Bas MP-48-A. In this installation an internal lead-in, Wire W-128, is used. Cut a 75-inch length of Wire W-128, clean and solder-tin M-inch of each end, and solder plug, item 11, on end of wire. Insert end of lead-in, with the soldering plug, item 11, upward through the mast base and secure item 11 with screw, item 9, at top of mast base. Place washers,
items 5 and 6, and collar, item 7, over Wire W-128, as shown in figure 20, and screw item 7 into bottom of mast base. Solder a terminal
lug, as shown in figure 30, to the
other end of Wire W-128. Secure terminal lug to antenna
terminal by means of a hex. head machine screw, %.24 x 72., as shown in figure 18. See figure
8 for assembly
of Mast Base MP-48. Cut a 14-inch length of Wire \V-128 for use as a ground wire and connect it as shown in detail C, figure 18.
Mast Section MS-53.
Screw into Mast Base MP-48 or MP-48-A.
Antenna AN-130, Handset TS-1S-( ),
These items are for'
and Strap ST -so.
portable operation of Radio Set ANI VRC-3-( ). Stow these items, and the technical manuals, in a convenient place in the vehicle.
SECTION VII INTER
PHONE EQUIPMENT ASSOCIATED WITH RADIO SET SCR-508-( ) OR
16. Require Parts ~tems necessary for installation of interphone equipment in Light Tank M5 series are listed below. Qutity 4: 1
4 4 14 14
Chest Set TD-.
Connector No. 61007 and Bondnut BL-50.
3E1307-5.S 3E1318 3E1604 3E2213
Cord CD-307-A, 65-inch, for headset,
Interphone Control Box BC-606( ). includingscews. clamps, etc. Cord CD-318, for Microphone T-30-( ),
Cord CD-604, 6-inch, for connecing Headist H5-3O-( ) to Cord CD-307-A. Cord CD-213, interphone cable. '
Adapter bracket, (Se fig. 27(B),)
Headset H-16/U or H5-30-( ).
Micrphone T -45 or T -30-( ),
'Heaset H5-18 may be substituted for Headset H5-3Q-( ). Wben thi is done, Cord CD- i. not used, . no lie is is one. '\ or .US 1:1 not use.
"In an emergency, Micrphone T-17 may be substituted for Microphone T-3Q( ) """ n tb' . d r d CD- .
17. Assembly and Installation
a. LIGHT TANK M5. (1) Interphone control boxes for driver and codriver. The interphone equipment
supplied for Radio Set SCR-508-( ) or SCR528-( ) is not completely wired for installation.
To interconnect Interphone 'Control Box BC606-( ), as shown in figures 2, 7; and 9, cut Cordage CQ-213 to lengths shown in figure 7. At the end of each length, strip back 4 inches of the outer rubber, 334 inches of outside shielding, and
2M inches of the shielding around red and green wires. Fold back each shielding about 34 inch arid
wrap and solder several turns of No. 18 tinned
hook-up wire around each shielding, leaving a 4-inch lead to be connected with the black wire of
the cable for making ground connection. Insert
explained in (1) above. Remove the plug attached
to the bottom end of the %-inch flexible conduit underneath the turret, and feed Cordage Co-213
through the conduit. Solder the wires to the appro~nate plug pins. (See fig. 9). Wire all shielding
to, pm E by means of the hook-up wire. Replace the plug on the conduit and attach the plug to its socket on the slip-ring assembly. Insert the upper en~ of the trepared cordage through the appro-
pnate hole m the tank commander's control box.
Solder wires to appropnate numbered studs (See fig. 9). Connect the shielding to stud No.8 with attached hook-up wire. Fasten cable with clamp
in control box. Prepare a short length of Cordage Co-213 and connect the tank commander's con-
trol box in paraIlel with the gunner's control box, Insert the prepared cable connecting the radio set
the prepared cable through the appropnate hole
to the terminal box through the appropnate cord-
in the interphone control box. Solder ends of wires
age hole in Mounting FT-237-( ) and wire and clamp to the terminal board. Insert the other end
to numbered studs and fasten the cable,with clamp in control box. Insert the prepared cable (connecting to radio set) through the appropnate cordage hole in Mounting FT-237-( ) and wire and clamp to terminal board. Figure 23 shows the winng of slip nngs and terminal boxes. (2) Interphone control boxes for tank commander
and gunner. Prepare proper length of cording as
of the cordage through the appropnate knock-out
hole in the terminal box, using the provided connector and bondnut. See figure 9 for winng the cordage to the terminal block in the terminal box.
(3) Location and assembly of components- (figs. 2 and 7). Install components of the interphone
equipment as follows: 15
.\let/iad aiid materi
Interphone Control Box BC-606-( ) (driver), on bracket, extreme left of
Seure in place with machine screws and lockwashers pro-
Adapter bracket. (Se fig. 27(B).)
Attach to exsting bracket on rear of turret ceiling with
vided. (Se fig~.2.)
Interphone Control Box BC-606-( ) (codriver), on bracket, extreme front, of right sponson.
~wo Interphone Control Boxes BC606-( ) (tank commander), (gun-
Secure in place with machine screws and lockwashers provided. (Se fig. 2.) Secure in place with machine screws and lockwashers 'pro-
vided. (Se fig. 2.)
ner), on bracket (fig. 27(B) ), rear of
turret ceilng. -
Headset H5-30-( ).
Use Cords CD-604 and CD-307-A, respectively, to connect headsets to jacks of Interphone Control Boxes BC-606-
Microphone T -30-( ).
To be strappe comfortably around throat above the larynx.
( ).' '
Use Cord CD-318 to connect microphones to jacks of Interphone Control Boxes BC-606-( ).
Extension cord for Headset H5-30-( ).
Control cord for Microphone T -30-( ).
Connects Headset H5-30-( ) to Cord CD-307-A.
Cordage Co-213, for interconnecting interphone components.
After mounting and interconnecting control boxes, secure cable along w.alls and hull of tank with clamps, screws, etc., provided with control boxes and listed in figure 2.
Headset H-16lU, Microphone T-4S.
Use in place of Headset H5-30-( ), Microphone T -30-( ),'
and Chest Set TD-4.
and associated cording, when available,
b. LIGHT TANK MSAL. For assembly and location of interphone equipment in Light Tank MSAl, se
figures 13, 14, 15, 16, and 17. The procure is similar to above procedure for Light Tank M5.
(0 - F1 i-
ø - PO lNSll G) - fi .sR
o 0 SP.. IlAI
o 0 Al ta (! - POLØIITC o - FA8IC Wi o - STEE WAIE
ø. stEL IU
G) - LØ
CD 0 F1R WA o . I'EL INSTOR o . FA8C 'MR o - SPR RETUIR
o - FI WASHE
-----¡ __ _ __ --
ø - POELA INSUTOR ø . FABRIC WASH
o 0 STEL lI o - STL NUT
o . I'KWHE
117S ..SID OI
ic-o-I14"-. Figure I. Mast Bases MP-J7 and MP-57. assembly for instaion.
CONTROL SOx 1I-60S-( ) , (COMMANDER) 3-'1-32 x 3/" SCREWS
II I HOOK ' , l'
/' I ".
12--a-32 X 3/a"SCREWS
.' ¡CONDUIT AND 'PLUG INSTALL-
MFR. ,lED IIY TANK
rlADAPTER BRACKET PER "G.
ORDAGE CO-213 l
I CONTROL BOX
111i-aOa-C lOUN NER) i 11 3-"a-32 X ~a"SCREWS
RADIO SET SCR-~Ol-'(
:1 SCR-~2a-C ) OR I II SCR-~3a-( ) .
MOÜ-NTI NG FT-237-( ~,
II i __ ~ i
II a-wla"-24II I ~a" SCREWS
CONTROL 1I0X 1I-I-C
ii a-Wla"-24 STOP NUTS
'3#a-32 X 3.a" SCREWS a-.-LOCKWASHERS
.. II AST IIASE MP-4a OR IiP-4IA
APPLETON CONNECTOR - TRANŠMITTER
-eIOO7~NO 80NONUT RECEIVER 8C-e03-( )
IIL-~O CORDAGE CO-213
HOÒK f2-:a-32x 3/a'SCREwS \2- a-LOCKwASHERS CONTROL BOll BC-eOa-C )(GUNNER)
CLAMP"4 a--a-32 II a/I"SCR£WS CONTROL BOX ii-eoe-C XCOMYANDER)
a-'a-LOCKWASHERS a-'a-32 X 3/1" SCREWS
3-'8-32 X 3/a" SCREWS '
SCREWS a-'a- LOCKWASHERS MOOKf~a-32 \Z'a-LOCKWASHERS . __--
CLAIiP.7 ~ r\ RADIO RECEIVER
CLAMP'4 11-"a-32 II 3,a'SCREW. .\1-- a-LOCKWASHER
a--a-ux 3.a"SCREWS ii-eoa-( ) 3-'a-LOCKWASHERS . RADIO RECEIVER
. 1I-e3- )OR INTER-"
CORDAGE CO-213 AMPLIFIER . PHONE Ii-eD~-( ) :i
CONTROL 1I0X IIC-eD6-C 3-'a-32 x 3/." SCREWS
MS-~I TO MS-~3 INCLUSIVE
. MAST BASE IiP-41 OR MP-4aA :COVE~-~~. (~SEE NOTE #4)
i " WIRE w-12a (SEE NOTE -3)
II ORC(~li~EGREW~~:L~A~~ ~:TlR-
:: TIGHT AT END OF CONDUIT,
CLAMP #4 1-#a-32X 3/" SCREW
SET SCR-~Oa-( )
) OR SCR-~3a-(
'SI007 BONDNUT 1l~
MOUNTING FT-237-( )
TERMI NAL BOXJ
e-~/IS"-24 x 1 3,a" SCREWS
IN STALLED 8'1
a-~/II"-24-STOP NUTS CONDUiT AND PLUG I! INSTALLED 8'1 TANK MFA.
:: - - I
LI ST OF SCREWS, NUTS AND LOCKWASHERS REClUI RED . FOR YOUNTING EQUIPMENT HEAD MACH, SCREWS e-~/le"-24X I 3.a" HEX,
a - ivie"- 24 STOPNUT
SCREWS 47 --a -STANDARD LOCKWASHERS NOTE: ALL MACH, SCREWS, NUTS AND LOCKWASHERS SHALL liE STEEL, GALVANIZED.
47-'a-32X 3/a'ROUND HEAD MACH.
CLAMPS PER ..IG.25 CLAMP -4 20 --a - 32 x 1/2" ROUND HEAD ..ACH, SCREWS ZO-#a-LOCKWASHERS
NOTES: i. FOR WIRING DIAGRAM
2. FOR CORDING DIAGRAM (SEE FIG.7) 3. WIRE W-121 SHALL aE CUT TO PROPER LENGTH. ENDS SHALL BE TINNED FOR ANTENNA CONNECTIONS, 4. COVER BG-IOa SHALL 8E USED WHEN MAST SECTIONS ARE NOT INSTALLED TL-'13331
CLAM P #7
2 - #a- 3Z'X 3/I"ROUND HEAD MACH. SCREWS 2 _'._LOCKWASHERS CLAM P 'i USE EXISTING
2- ivle"-24 X ~,e"HEX. HEAD YACH. SCREWS 2 - $/ie". STANDARD l.Oi;KWASt:£RS
Fif!ure 2. Imtaio of Riio Set SCR-so8-( ), SCR-S28-( ), or SCR-SJ8-( ) and associated interphorn equitmient in Light Tank MS, .
HOLE Fa" M~-., OR M...,-A
CD BR,ACKET IFIG 27C) FOR TERMINAL.
ii DRILL - " HOii~ FOR IR MAST lASE .,
TANK !l I I
BRACKET IFIG.iIC) FOR
CONTROL LOX IC-60l-1 I BRACKET IF'G,21 Al FOR CONTROL. LOX IC'IOl"1 I AND SWITCH BOX IC-I5I'O
IFIG,ill BRACKET IFIG, iaii FOR CONTROL. BOX Bc.aoi'i I
IN TURRET 'MOUNTING FT'
~AD IF.G.'OI FOR IN5UI.ATOR '10- "
SPACER IF'G, 2BOI FOR CAlLI
172 OR FT"171
S~ACER IFIG. 21 II FOR HEADsiT HOOKS PI.ATI IFIG, 221 FOR INTERPHDNI AM~LIF'ER LOX IC"i67
S~ACER IF'G. 21 A I 'OR AM~LI" 'I£R PI.ATI IF'G.221
. i I I
.? ..-.. -=-=-1
OF S~ON50'" l'
SEcTION viEW -A-A' OF
liE AR BULKHEAO
rRIAI! IULICHIAO I
FI.OOR 1.1101 ~ ' ?
=' '-=_.. _-_'-_-=-1 = -=-.._-=-J, LEFT SIDE ELEVATION
NOTE' '1 FOR "AOIO' MOUNTING' HOLES A"Õ ..OCATION IN S~ONSONS SEE FIG. ii. i MANUFACTURER SHALL FURNiSH AND INSTALL .AI.1. MOU,NTING OETA.I.S;
~ MOUNTING DETAILS SHALL IE SECUREL" WELDED IN ~I.ACE AND THE" PAINTED TO CÒNFORM TO COLOR D' 'URROUNOING A"EA OF'TANIC: '
Figure J. Location of mounting llles and brackets for radio and interphone equipment in Light Tank MS. '20
.18 (.169~.1 DRILL
- LEn sioe
Figure 4. Dring of Radio ReceifJ BC-JI2-( )fOT Moiniing FT-178.
ROO MAY BE BENT TO SUIT CONDITION
RADIO RECElVER OR TRANSMITTER
I.MOUNTING (FT-172 OR FT-178)
REENFORING PLATE USED WITH FT-172
Figure 5. Assembly of Mounting FT-172 or FT-I78.
WS-49 TO ws-sa COVE" BG-n (SEE NOTE
_ ~, 'NCL.USIVE i i I i
: MAST BASE
i MP-37 110-'.
GNO. RADIO RADIO RECEIVER BC-312-()
TL-l333-1 rïgwtl 6, Cording duigram jor:Radio Set
FRONT OF TANK
RADIO RECEIVER .BC-312-( )
MOUNTING F"T-llS2 .
~--~~, ,. --- :i~ --- ' --T-
t OF TURRET
\ (INSTALLED BY /
\ \~TANK MF"G.) /
~ p- -n " : ¡.. Ii II " _M ii - ,,_
RADIO TRANSMITTER BC-223-( ) MOUN'rING FT -.173
COVER BG - 88 MOUNTING FT-172 INSULATOR IN -, 8 DYNAMOTOR UNIT PE-!i5 MOUNTING FT-185
COVER BG-77 MAST SECTIONS MS-4f TO MS-53 INCLUSIVE. AND MAST
COVER BG-S7 (SEE NOTE !i)
LOCATION OF EQUIPMENT
I. SEE F"IGURE !i FOR ASSEMBLY OF
FT-172 AND F"T-178.
2. FOR LOCATION OF MOUNTING HOLES. BRACKETS, AND TERMINAL BOX. SEE FIGURE 3. 3. FOR MOUNTING HOLES AND LOCATION IN SPONSON SEE FIGURE 12.
4. WIRE W-128 SHALL BE CUT TO PROPER LENGTH. ENOS SHALL BE T~NED FOR ANTENNA AND GROUND
5. COVERBG-87 SHALL BE USED WHEN MAST SECTIONS ARE NOT INSTAL,LED.
SCR-z4j-U in Light Tanks MS and MsAi. 23 .
I 2 i I
BC-604 -II BC'IOS'II IC-60S'11
I I 2 i
/TRANS. 12 OYN. VOLT R~C. OYN,
fRANSMITUR R~C~IV~R IHUR. AMPL.
RADIO SET CO"'PONENTS'
ItlTERPHOtlE COtlTROL BOX
BONO NuT BL" 50
APPLETON CONNECTOR ..61007
8 Y MFR.
ItlTERPHONE CONTR~ BOX BC- 606'11 iGUNNER)
"'AOE WI. TE,R. TIGHT AT END Of'CONDUI!
CORDAGE SHALL 8E TAPED OR OTHERWISE
SHALL 8E TitlNEO FOR COtltlECTlONS. S' FOR WIRltlG DIAGRAM SEE FIG. 9. 4. FOR INSTALLATION SEE FIG. 2. 5. I-HEADSET HS- 30-11, AtlD I-MICROPHONE T-30-11 SHALL 8E CONNECTED TO EACH CONTROL 80X. 6.' COVER 8G "10 I SHALL 8E USED WHEtl MAS T SECTlOtlS ARi
2. EtlDS Of WIRE W-128 AFTER 8E ItlG CUT TO PROPER LEtlGTH
tlOTE. l. CORDAGE LENGTH.S GIVEtl INCLUDE ALLOWAtlCE FOR IiAl(ING COtlNECTlOtlS Itl BOXES AtlD MOUtlTltlG.
TERMINAL BOX INST ALL EO BY MfR,:
SW"141 AND PLUG INSTALLED
¿CORD CO'SI8 141'1 SNiITCH--~ ~LEXIBLE CONDUIT
CD-6~ ~ ~O CO"S07-AI65'1
INTERPHONE CÒNTROL BOX
Fieure 1. Cording diagram of Radio Set SCR-so8-( ), SCR-S28-( ). or SCR-S38-( ) and associated interphone equipment in Light Tank MS.
RADIO sn SCR"531_"U
UDIO SiT SGR'5ZI"I)
RADIO SET SCR'501"1I
WIRE W"121 JSEE NOTE 2)
ISEE NOTE 6)
MAST 8ASE MP'41
"'S" 51 TO "'5 '53
-.CORDAGE CO, 21S 1l1"1
CO - 2131 59"1
BC" 606,-11 IDRIVER)
INTERPHONE CONTROL BOX
BASED ON ~ SC-A-6743- D
0-COLLAR .', (V-ADAPTER
~ V PLUG
lIi _, ' Q_SOLDERING
8-STEEL ,NUT Q_SOLDERING
~_PORCELAIN ~ INSULATOR r: ANTENNA
Figurt 8. Mast Base MP-48, assembly Jor installation.
ASSEM Y 7.
ITEM 7-G FROM
ASSEM~ 6, USE
Q_PORCELAIN 0-LOCKWASHER' ~ INSULATOR
~ 8-W'RE W-128
FOR ITEM 8.
r I I
i I I I I I
I i I i
../ ~I 81
MAG MIC MIC_ J3 J2
I_PH i:NTRÒL ii BC-l DRIVER)
MAIC PH MICMIC J3 J2 II.TERI'NE CONTROL BOX BC-(CO-DRIVER)
l FOR WIRING OF SLIP RINGS ..D TERMINAL SDXES SEE FIGUR( Z3 Z. Rl CODING DIAGRAM OF RADIO SET SCR-SOB-l ) SCR-S2!11 ) Ql
SCR-S3B-( i AND INTERPHNE EQUIPMENT SEE FiGuRE 7-
i. SHIELD OF CABLE a SHIELD OFTWISTED PAIR OF LEADS IN CA SHA BE SECURELY GRDED AT EACH END. . 4. ENS OF ALL UNUSED CABL£ WiRE SHLL BE TAPD. 5. DOTTED CIRCLE AROUND CA EN INDICATES SHIEI
I~Y~ øI I rl8IK
l.UN FT- ~7-l
Figure n. Wiring diagrAm of intrpho equipm for Radio Su
PW WHICH ..LL fIT lllTO soF: ON SLIP RING BO
MAETIC IIIC PHE
Iile JJ JZ
INTPHE COROL BOX Be__-( I
Ille ..ic PHONE
Iile J3 JZ
IHTPtNE CONTRO BOX BC-' i (GUNER)
SCR-S08-( ), SCR-S28-( ), 01 SCR-SJ8-( ) in Light Tank MS.
~ APPLETON CONNECTORS -61001 :) BONDNUTS IL-aO
til L (INSTALLED BY MFR') )
TER..INAL BOX '.
_____ _~__ !!!..!L.!~!!!.O.!L (
PAD (! I: MAST BASE MP-37 \
I MS-'" TO MS-$3 INCL.
- MAST SECTIONS ~
_..:.~- - - .:-- - - - --~
INSULATORS IN-ll WIRE W-141(SEE NOTE .,
FiiUTe 10. InstaJlatio1l oj Radio Set SCR-S06-( ) in LigJi Tallks MS aiid MSA i.
12-1I...X 20 HEJe. NUTS
..OUNTING FT-2!!3-( ) 12-I/.X 20 X ll1.HEX.HEAD ....CH. SCEW'
e--e-32 X IIZ.ROUND HEAD MACH. SCREWS
1--1 &.PCKWASHERS INSULATOR IN-III
SWITCH BOX BC-6$1-( ) 1-"e-312 X WI.HEX,HEAD'..ACH.SCREWS
SCREWS, NUTS AND LOCKWASHERS
"'AST SECTIONS "'RE NOT INSTALLED.
t. WIRE W-14e SHALL BE CUT TO PROPER LENGTH. ENDS SHALL BE TINNED FOR ANTENN'" CONNECTIONS. 10. COVER SG-e7,SHALL BE USED WHEN
e. ..1 IS COMPLETE WITHOUT TURRiT
7. "'$1.1 HAS TURRET BULGE. j,
e. PAD FOR MOUNTING INSULATOR IN-8I
TO BE ELECTRO GALVANIZ~D. S. SCREWS, NUTS AND LOCKWASHERI ARE fURNISHED WITH MOUNTING fT-2U-( ) AND SWllCH 80X BC-6U-( )
... ALL SCREWS, NUTS AND LOCKWASHERS
TANK MI SEE fIG.I
I. FOR LOCATION OF BRACKET,S IN LIGHT
LIGHT TANK"'S SEE FIG.12
2. FOR CORDING DIAGRA.. OF RADIO SET SCR-$Ol-C ) SEE FIG.II
NOTES: I. FOR LOCATION OF MOUNTING HOLE' IN.
STElL PAD 0
-l i. i\.
,APPLETON CONNECTORS -61007
II ~"_" ..~..,'"\...-
(INaTALLEO IV ..FR.)
TER..I NAL BO X
BC-I06-( ) CCO-DRIVER)
l-BRACKET 11.1 REAR BULKHEAD)
II ' h . RIGHT SPONSON'// ~~-----~
#' .. (I ,,_u--'"
¡ COVER 8G-67 (SEE NOTE PAD/'1\!7 i ~~_-:=':_=t
ORS IN-iJtr MAST BASE MP-37
u¡ MS-4' TO MS-U
""-- MAST SECTIONS
PLAN VIEW OF RIGHT SIDE OF TANK
-- --.==~' ...~._ II ..--.__ .~. _.', f-
-- 0 ANIS_ II --
.1 . . .
RADIO SET t~
. I ..
MOUNTING FT-2n-( ) BRACKET(FIG.27C)
~ L ¿;..OUNTING FT;"2$3-( INTERPHONE CONTROL BOX )
,.f' li --l
SWITCH 80X 8C-ial-( )
1-32 TAP 1 HO.LI'
MOUNTING FT - 2e3 -( )
TO BINDING POSTS.
ENOS Of WIRE W -14. AFTER BEING CUT TO PROPER LENGTH. SHALL BE TINNED fOR CONNECTION
BC -6e2 -( )
DM-40 -I I
RADIO SET SCR - !l06 -
(PART OF INTERPHONE SYSTEM)
BC-606 -I IICO- DRIVER I
INTERPHCE CONTROl BOll
n!i ... L II r~~iÄi
MS-49 TO MS-53
TERMINAL BOX (INSTALLED BY MANUFACTURER)
DM-42 -( I
I . "'AST BASE MP - 37
fOR INSTALLA'rION Of RADIO SET SCA -e06-( I SEE fiGURE
fOR ADDITIONAL COMPONENTS AND SPARE PARTS SEE PART LISTS.
APPLETON CONNECTORS NO,61001 BONONUTS BL-GQ
Figure 11, Cordiiig diagram of Riidio Set SCR-S06-( ) iii Light Tmiks MS aiid MSA 1.
MICROPHONE T - ~O -I I
13" 3 !2
r 3iio 22" .!-3* +- 7 ã
-i-l - -- + - :+ 7"
-f. I SCR -528-( lOR SCR-538-( I + + 3"
l-t t-t i - I : ~:~~.
I":I! RIGHT SPONSON
CD I CD
" ' - 32 DRILL - 33 HOlS !
RADIO SET SCR-245-f)ii~"
+1+ -Hl .a
"-Ill I RADIO SET SCR - 508 -( I
RADIO SET SCR - 506 - ( I
Figure 12 . Mounting holes and location for radio sets in SP01l501l£ of Light Tu"k MS.
'" - 16 MARED A
to t-ICD I .§" DRILL - 8 HOLES on
.r~:11 ~ 1- ~J-- .l~lJ i: -lA..+ + _ "-I!!
OWi _ I I f"~ . 1-+-+ i At.
SHIELD SHALL BE SECURELY SOLDERED
* SEE NOTE
END OF CONDUIT 1l18
2 !i 60 +
HULL TERMINAL 12V
ii IS YELLOW
-18 BLUE SHIELDED #18 GREEN SHIELDED '*1 8 BLACK +
WIRING, TERMINAL BOXES AND SLIP RING ASSEMBLY IS FURNISHED AND INSTALLED BY MANUFACTURER OF VEHICLE. THESE TERMINAL BOXES .ARE USED FOR RADIO AND INTER
PHONE WIRING ONLY,
* ALL SHIELDS ON SHIELDED WIRES SHALL BE GROUNDED ON BOTH ENDS. TL 13339
Figure 13- Wiring ditgru1t of slip rings und terina boxes in ¡¿-volt Light Tank MsAr.
r" l (' II "i
MIC J3 J2
" ENDS QÇ AL UNUSE CA WIRE SH 8E TAPED.
3. SHIELD QÇ CALE a SHIELD QÇ TWISTED AIR QÇ L£ADS' IN CABLE SHALL BE SECUREL GRONDED AT EAC EHO
Z,Rl WIRING OF SLIP RINGS AND TERMINAL BOXES
SC-lll!-( ). SCR-1l3B-( ) SEE fiGURE Ie.
L Rl CODING DIAGRAM QÇ RAio SET SCR-50-1 )
TERMINA STRIP IN MOUNTING fT-Z31-( I
il ~ ~ ~ ~ ! ~ ~
~ '~III 'z ~ ' ". l ~
INTERPtE CONTROl BOX BC-60i-/ I ICO-DRIII I
MANETIC MIC PHONE
lSEE NOE 4)
.NIC J3./ ' a ~ CO BO BC-sI . i GUNE81
MAETIC ..ic PHON
..l i~ CD I a~..$
l- l¡ j W
Lt- -~-.i-tJII~TURRET BASET)
! - N ,. i I TERMINAL. BOX
h 'r ION L£FTWAlLOFItUlLI
-: r---õ-~-õl \=/' I I ~"' + ~ J' ,
TMI L ~ 1) . \ / TERMINAL BOX
r--:5-: \i.iiia~i rt;-õF..' (._) ¡dri~~ ~ ~)1-::ç --l II (\ &:~(S il_~__~
(SEE NOE 41 .
i 1'-':i _____.£i.--~---
Figure 14. Wiring diagram 0/ inlerphone equipmnt/or Radio Set SCR-so8-( ). SCR-sz8-( ). or SCR-S38-( ) in Li¡:ht Tank MSAi.
NIC J3 JZ IN1ERPHONE COTROL 80X BC60-(
MANETIC MIC PHONE
INTERPHONE CONTROL. BOX BC-60i-1 I (DRIVER)
MIC J3 J2
MAGNETIC MIC PHNE
:! - _.
RADIO SET COMPO"ENT!!
OM-35-1 10M- 54-II
APPLETON COHNECTORS -61007 BO"DNUTS BL' 50
00 I 00
BC' 605'1 I
RADIO I RADIO
'SEE 'IGUIIE 14.
80K MOUNTING BRA'CKETS fOil VEHICLES WITH PHONE BOK MOUNTING LAMINATED fABRIC INTER BRACKETS SEE FIGURE 17.
CONTAINING RIGID (NON- SHOCK MOUNTED
S. THIS DRAWING APPLIES TO LIGHT TAN~S MSAI ,
BIHDING POST' ON 1I0UNTING FT. zn.( I.
SSI-I I CONNECT WillE W-12' ISZ.I TO ANTCNHA
CO"NECT WIRle W-IUIU.1 TO ANTENNA BINDING POST ON TRANSMITTER. FOil RADIO SET SCII.
"fOR RADIO SET SCII'SOB-( ). AND SCII-SU-( l.
MASS INSTALLA TION. CHECK CORDAGE LENG T HI BY MUING A PILOT INSTALLATION.
"I-HEADSET HS-SO-I I. AND I'MICIIOpHONE T.SO-I I SHALL BE COHNECTED TO EACH CONTROL BOll. f. BEfORE CUTTING A OUANTITY OF CABLE FOil
FOil ANTENNA CONNECTIONS. S.USE COVER 8G'IOI WHEN MAlT SlCTIOIl AilE 'NOT INSTALLED.
'.CUT WIRE W.12. TO pIIOPER UNITH. TIN INDI
SEE fiGURE IS,
S.f'OIl WIRING OIAGIIAM OF SLIP IIINGS
Z.fOR I"SULLATION OF IIADIO SET SCII-SO'.( I. SCR-SU-I I. SCR-'SSB'( I SEE fIGURE I'.
SCR-5ZI-II. SCR-SU-( I
L fOil WIRI"G DIAG""M 0' ""DID SI T ICII"SO'- ( I.
CO,9 ,ç!l: 271
DYNAMOTORS DM- 54-I I
(INSTALLED IT Mfll.)
APPLETON CONNECTORS -11007 10NDNUTS IL- SO
CORDAGE CO-lIS 1...1
IC'IDI- I I ' '
l- IMTERPHONE 10K ICO- DRIVEl C:DNTIOL 1
Figure IS. Cording diagram of Radio Set SCR-so8-( ). SCR-SJ8-( ). M SCR-S28-( ) and associated interphone equipment in Light Tank MSAi.
RADIO SET SCR-SU-I I
IIADIO SET SCII'SU-I I
TRANS. BC 604'1 i
CORDAGE CO, ZIHSO"I
CORDAGE CO - II' ltO'1
MAST SEC TtONS MS- SI TO MS - 5 S INCL.
IIADIO SET SCR.SOB-II
BC- 101- I I
10111 VE RI
INTUPHONE CO"TIOL 10K