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Home :: Radio Set VRC-1
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Radio Set VRC-1

Radio Set AN/VRC-1-( ) is procured with one high-frequency radio transmitting and receiving set ( Radio Set SCR-193-( ) ), and one very-high-frequency radio transmitting and receiving set ( Radio Set SCR-542-( ) ), assembled in Cabinet CH-217, as shown in figures 31, 33, and 34.

a.) Components.
The following list of component parts of Radio Set AN/VRC-1-( ) is included for reference purposes:

Quantity Stock No. Item
b2   Bonding Jumper, 1/2" wide, 5" long.
2   Bonding Jumper, 1/2" wide, 8" long.
a1   Bonding Jumper, 1/2" wide, 5" long.
a1   Bonding Jumper, 1/2" wide, 3" long.
b2   Capacitors, 0.01 mf. (for Dynamotor Unit PE-98)
1 6F915 Cabinet CH-217, including Mast, Rack FT-476, brackets, and hardware for mounting.
b2 ft 1B1543 Cable WC-543 or WC-549 (coaxial).
a1 2ZI848 CS-48, for transmitter tuning units.
b1 2Z1880 Case CS-80-( ) M, modified, with six Lord Shock mounts, Type 153-PH-24, replacing original mounts.
a1 3E1237 Cord CD-237, connects Dynamotor Unit BD-77-( ) to Radio Transmitter BC-191-( ).
a1 3E1358 Cord CD-358, connects Radio Transmitter BC-191-( ) to terminal box.
a1 3E1411 Cord CD-411, connects Radio Receiver BC-312-( ) to terminal box.
a1 3E1165 Cord CD-165-( ), connects Dynamotor Unit BD-77-( ) to terminal box.
a1 3E1424 Cord CD-424.
b1 3E6000-58 Cord CX-58/VRC-1.
a2 2Z2651-421 Clamp MC-421, for securing Mast Sections MS-49 and MS-50, one in use, one spare.
a2 2Z2651-422 Clamp MC-422, for securing Mast Sections MS-50 and MS-51; one in use, one spare.
a2 2Z2651-423 Clamp MC-423, for securing Mast Sections MS-51 and MS-52, one in use, one spare.
a2 2Z2651-424 Clamp MC-424, for securing Mast Sections MS-52 and MS-53, one in use, one spare.
b1 3E6000-59 Cord CX-59/VRC-1.
b1 3E6000-60 Cord CX-60/VRC-1.
b1 3E6000-61 Cord CX-41/MC-1.
b1 3E6000-63 Cord CX-WIVRC-1.
1 3E2260 Cord CD-260, connects terminal box to vehicle terminal  box.
b4 3E2213 Cordage CO-213.
a1 2Z3375 Cover BG-75-( ), for Radio Receiver BC-312-( ).
a1 2Z3378 Cover BG-78-( ), for Radio Transmitter BC-191-( ).
a1 3H1359 Cover BG-79-( ), for Dynamotor Unit BD-77-( ).
b1 6Z3147 Connector No. 61007 and Bondnut No. BL-50 (Appleton).
a1 3H1777 Dynamotor Unit BD-77-( ), including mounds FT-107-( ) and spare fuses and brushes.
b1 3H1898 Dynamotor Unit PE-98-( ), modified by insulation of two 0.01mf capacitors, listed above, as shown in figure 21.
b2 3ZI959 Fuse, FU-59 40 amp, Littefuse type 4AG, one in use, one spare.
b1 3Z2843 Fuse Block, with clips (for 1 1/4" x 1/4" fuse).
1   Hardware Kit, for Mounting components.
a4 3G604 Insulator IN-104.
a3 3G621 Ingulator IN-121.
b1 2C1738 Interphone Control Box BC-606-( ), Including attached hardware.
b1 2Z5600-33 Juncton Box J-33/VRC-1.
b1 2B1770-299 Microphone Adapter M-299, including plug.
a1 2Z6712 Mounting FT-172, snubber for Radio Transmitter BC-191-( ), including Hardware.
a1 2Z6718 Mounting FT-178, snubber for Radio Receiver BC-312-( ), including hardware.
b2 2Z6721-475 Mounting Bracket FT-475.
b1 2Z7226-173.2 Plug PL-P173.
b1 2Z7380-244 Rack FT-244-( ).
a1 2C4312 Radio Receiver BC-312-( ), including one Mounting FT-162, one Dynamotor DM-21-( ) and one set of tubes installed, and bag of spare fuses and lamps.
b1 2C4424 Radio Receiver BC-624-( ), including two Crystal Units DC-11-( ) or CR-1-( )/AR, one set of tubes installed, and one set of tubes in Box BX-19-( ).
b1 2C6525 Radio Transmitter BC-625-( ), includes two Crystal Units DC-11-( ) or CR-1( )/AR and set of tubes installed.
a1 2C6191 Radio Transmitter BC-191-( ), includes one Mounting FT-151-( ), fuses, lamps, one set of tubes installed, spare tubes in Box BX-8, one Socket Cap M-164-( ), and two Socket Caps M-165-( ).
b1 2C3347 Radio Control Box BC-602-( ).
b6   Shockmounts, Lord Mfg. Co. Type 153PH-24, for Case CS-80.
a1 2Z8793 Socket Cap M-163-( ), for Radio Transmitter BC-191-( ).
a1 2Z9313 Terminal Block TM-183, for terminal box.
1 2B1172.3 Terminal Box.
a1 2C8006 Transmitter Tuning Unit TU-6-( ).
a1 2C8007 Transmitter Tuning Unit TU-7-( ).
a15 ft 1B128 Wire W-128.
a Indicates components of high-frequency portion ( SCR-193-( ) ) of Radio Set AN/VRC-1-( ).
b Indicates components of very-high-frequency portion ( SCR-542-( ) ) of Radio Set AN/VRC-1-( ).

 

Figure 21: Installation of Radio Set SCR-284-( ) in Truck, 1/4 ton 4x4

 

Figure 31: Installation of Radio Set AN/VRC-1-( ) in Truck, 1/4 ton 4x4, front and back

b.) Installation Components.
The following components of Radio Set AN/VRC-1-( ) are used when installing the radio in Cabinet CH-217, in the vehicle:

Quantity Stock No. Item
b1 3E1689 Cord CD-689.
a1 2Z3367 Cover BG-67-( ), for Mast Base MP-57.
b1 2Z3400-108 Cover BG-108, for Mast Base MP-48-A.
b1 2A2088-48 Mast Base MP-48-A.
a1 2A2088-57 Mast Base MP-57.
a1 2A2090-63 Mast Bracket MP-63.
a Indicates high-frequency items.
b Indicates very-high-frequency items.

c.) Stowage Components.
The following components of Radio Set AN/VRC-1-( ) must be stowed in the vehicle:

Quantity Stock No. Item
a1 2A275-27 Antenna A-27, phantom, for Radio Transmitter BC-191-( ).
a1 2A224A Antenna AN-24-A, auxiliary antenna, for Radio Transmitter BC-191-( ).
a1 2Z1108 Box BX-8, for spare tubes.
a1 2Z1119 Box BX-19-( ), for spare tubes.
a1 2Z1121 Box BX-21, for Box BX-8, BX-19-( ), headsets, spare parts ect.
3 3E1307-5.5 Cord CD-307-( ), 65", for Headset HS-30-( ), includes one spare.
2 3E1318 Cord CD-318-( ), Microphone T-45.
3 3El604 Cord CD-604 6", for connecting Headset HS-30-( ) to cord CD-307-( ), includes one spare.
3 2B830 Headset HS-30-( ).
a3 3G586 Insulator IN-86, two for auxiliary antenna, one for tying down Mast sections.
1 3G604 Insulator IN-104, spare.
1 3G621 Insulator IN-121, spare.
a2 2A2349 Mast Section MS-49 one in use, one spare.
a2 2A2350 Mast Section MS-50 one in use, one spare.
a2 2A2351 Mast Section MS-51 one in use, one spare.
a2 2A2352 Mast Section MS-52 one in use, one spare.
4 2A2353 Mast Section MS-53 two in use, two spare.
1 2B1617 Microphone T-17-( ), spare.
2 2B1567 Microphone Cover M-367, for Microphone T-17-( ), includes one spare.
2 2B1645 Microphone T-45.
a1 2Z8056 Roll BG-56-( ), for mast sections.
50 ft 6Z7926 Rope RP-5.
a2 6D13073 Technical Manual TM 11-273 for Radio Set SCR-193-( ).
b2   Technical Manual TM 11-509 for Radio Set SCR-542-( ).
b1 3F4139 Test set I-139-( ).
a Indicates high-frequency items.
b Indicates very-high-frequency items.

 

Figure 32: Mast Base MP-48-A, assembly with coaxial lead-in connection

 

Figure 33: Wiring diagram of Radio Set SCR-193-( ) using terminal Block TM-183

d.) Notes.
(1) All screws, nuts, lockwashers, clamps, hooks, etc. ate in a heavy cloth bag permanently and plainly marked. "Contents Hardware for Radio Set AN/VRC-1 installed in Truck, 1/4-ton, 4 x 4."

(2) Eight each Crystal Unit DC-11-( ) or CR-1- ( ) /AR are required to complete equipment, for operation on the four pre-set transmitting frequencies and four pre-set receiving frequencies provided for in the radio set. The radio set will operate satisfactorily without a complete set of crystal units installed. The number of crystal units installed in the transmitter and receiver determine respectively the number of transmitting frequencies and receiving frequencies available for use at any time.

One each receiver crystal, frequency 8007.692 kc, and one each transmitter crystal 6450.0 kc are furnished for operation on a carrier frequency of 116.10 mc while one each receiver crystal, frequency 8155.714 kc, and one each transmitter crystal, frequency 7010.0 kc, are furnished for operation on a carrier frequency of 126.18 mc.

Additional crystal units for use in the transmitter and / or receiver may be ordered by specifying the carrier frequency of the signal it is desired to receive or transmit. The number of crystals to be furnished per radio set should be specified by the requisitioning arm or branch. Request for additional crystals should be submitted through channels established by the air forces to the crystal bank of that air force.

(3) If authorized, three auxiliary transmitter tuning units, in addition to Transmitter Tuning Units TU-6-( ) and TU-7-( ), may be supplied with three Case CS-48.

(4) The 24-pound mountings shall be substituted for the 12-pound mountings normally furnished as part of Case CS-80-( ) and Dynamotor Unit PE-98-( ) because of the added shock load in vehicular installation.

(5) Capacitors shall he installed between the input brush terminals and frame of Dynamotor Unit PE-98-( ) to suppress noise emanation. Method of installation is indicated in figure 31, detail E

(6) The standard name plates of Case CS-80 and Dynarnotor Unit PE-98-( ) shall be stamped or otherwise changed to read Case CS-80-( )M and Dynamotor Unit PE-98-( )M respectively, to indicate the modifications described in subparagraphs (4) and (5) above.

19.) Assembly and Installation.
a.) Preliminary Check.
Truck, 1/4-ton, 4 x 4, ordinarily has a 6-volt electrical system. Radio Set AN/VRC-1-( ) requires 12 volts for operation. Kit, 12-volt Conversion, Truck, 1/4-ton, 4 x 4, supplied by the Ordnance Department, must be installed in the vehicle, as shown in Modification Work Order G-503-W-7, in order to supply 12 volts to the radio set. Additional items for improving the suppression of the vehicular electrical system are provided with the conversion kit. Make sure that the conversion kit has been installed in the vehicle before installing the radio set.

b.) Procedure.
(1) Since Radio Set AN/-VRC-1-( )  is procured with its principal components assembled in Cabinet CH-217, installation procedure is simplified. Place Cabinet CH-217, in the rear of the vehicle and secure with the four brackets provided, two on each end, as shown in figure 31.

(2) In order to reduce radio noise interference caused by the electrical system of the vehicle, Cabinet CH-217 must be bonded to the vehicle by means of the provided bonding jurnpers, one on each end of the cabinet. Drilling details for the necessary holes are shown in figure 31.

(3) The surfaces around the mounting  holes at the point of contact between the bonding jumpers, the cabinet, and the vehicle, should be prepared by first removing the paint and cleaning the surface with sandpaper, a file, or emery cloth. Then tin with solder. Shakeproof washers should be used between the bonding jumper in the cabinet and between the bonding jumper in the vehicle, and the bolt securing the bonds must be tightened firmly.

(4) Route Power Cord CD-260, to the vehicle terminal box as shown in figure 31 and connect the positive and negative leads to the corresponding terminal in the vehicle terminal box. Secure Cord CD-260 in place with the provided clamps and hardware.

c.) Installation of Mast Base MP-48-A.
Refer to figure 32 and install Cord CD-689 inside the mast base as shown. Remove item 9 in order to observe that the tip of Cord CD-689 engages the slot, then replace and tighten the screw. Screw adapter coupling, item 15, into the bottom of the mast base. Remove items 2, 3, and 4 from the bottom of the mast base. Install the mast base in the mast base well, located in the top of Cabinet CH-217, and secure with items 2, 3, and 4. If coaxial connector is not already attached to the coaxial cable, prepare the end of the cable as shown in figure 32, and attach the connector to the cable. Connect the coaxial cord from Mast Base MP-48-A to Radio Transmitter BC-625-( ) as shown in figure 31. When Mast Section MS-53 is installed in Mast Base MP-48A, and a lower clearance height is desired, the mast base may be flexed 90' and the mast section held in a horizontal position by pulling the mast section down and engaging the mast section in the hook provided on the top center of cabinet CH-217.

d.) Mast Base MP-57 and Mast Bracket MP-63.
Remove nuts and washers holding spare wheel on the rear of the vehicle and, using the same nuts and washers, secure Mast Bracket MP-63 to spare wheel stud as shown in figure 31. Refer to figure 8 and assemble Mast Base MP-57 as follows: Place item 1 over the hole in the mast bracket. Place item 2 over item 1. Place item 3 over item 2. Insert item 4 through the hole in the mast bracket. Place item 5 over the flange of item 6. Insert item 6 upward through the hole in the mast bracket. Place items 7 and 8 beneath item 6 and fasten entire assembly in place with items 9 and 10. Connect Wire W-128 as shown in figure 31.


Figure 8: Mast base MP-57, assembly for installation

e.) Stowage Items.
All. items, such as: Boxes BX-8, BX-21, Roll BG-56-( ), etc., that are listed in this instruction as items to be stowed, shall be stowed at the discretion of the using arm. Mast Rack FT-476 is provided on top of Cabinet CH-217 for carrying mast sections.

f.) Interfereence of Mast Section MS-53 with Vehicle Top.
A hinged arm is provided on top of Cabinet CH-217  to hold the vehicle top away from Mast Section MS-53. This must be used to prevent contact between, the vehicle top and the mast section when the very-high-frequency portion of the set is used while the vehicle top is up.

Figure 34: Cording and wiring of V.H.F. portion of Radio Set AN/VRC-1-( ) in Truck, 1/4 ton 4x4

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