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Radio Set SCR-499

20 Required Parts.
a.) Items necessary for installation of Radio Set SCR-499-( ) in Truck, 1/4-ton, 4 x 4 are listed below:

Quantity

 Stock No. Item
4 2A315 Anticorona ball.
1 2C527-939 Antenna Tuning Unit BC-939-( )  including 1 Capacitor CA-423, 1 capacitor, vacuum, 12-mmf.
10 feet   Braid, copper, strand for ground lead.
*1 2Z1119 Box BX-19-A may be removed from Chest CH-121-( ).
2 6Z6815-13 Bulb, 50-watt, 115-volt, for trouble lamp.
1 2Z2588 Chest CH-88-( ).
1 2Z2599-121 Chest CH-121-( ).
2 2Z2651-421 Clamp MC-421.
2 2Z2651-422 Clamp MC-422.
2 2Z2651-423 Clamp MC-423.
1 2Z2651-424 Clamp MC-424.
2 3E1201 Cord CD-201, for Key J-37.
1 3E1564 Cord CD-564.
2 3E1605 Cord CD-605, 78", for Headset HS-30-( ).
2 3E1763 Cord CD-763.
4 6Z3654 Drum, gasoline, 5-gallon.
1 6Z3787 Extinguisher, fire, 4-1b. size, with holder.
1 2C1411 Frequency Meter Set SCR-211-( ), with TM-11-300.
*2   Gasket. insulator, for Mast Base MP-47-A (remove from spare Mast Base MP-47-A).
1 3Z3437 Key J-37 (spare).
1 3Z3445 Key J-45.
2 6Z6815-13 Lamp, trouble, 115-volt.
1 2A2088-17 Mast Base MP-47-A.
1 2A2090-59 Mast Base Bracket MP-59-A.
4 2A2349 Mast Section MS-49.
4 2A2350 Mast Section MS-50.
4 2A2351 Mast Section MS-51.
2 2A2352 Mast Section MS-52.
6 2A2353 Mast Section MS-53.
*1   Mounting FT-162 (one may be removed from Chest CH-121-( )).
*1 2Z6718 Mounting FT-178 (one may be removed from Chest CH-121-( )).
1 2C4342 Radio Receiver BC-342-( ), including TM-11850, two Lamps LM-27 (spare), one set of tubes installed, and one set of spare tubes.
1 2C6500 Radio Transinitter BC-610-( ), including shock mounting, tuning units, spare fuses and lamps, one set of tubes installed, and one set of spare tubes.
50 feet 6Z7926 Rope RP-5, for tying down mast sections.
2   Stake GP-8, for fastening Rope RP-5 in ground.
2 6Z3654/1 Tube, flexible nozzle, for 5-gallon drum.
1 roll 6N8692 Tape, rubber, 1/2".
100 feet   Wire, antenna. No. 12 gauge, enamel, stranded.
3 feet 1A28 Wire,W-28.
*These items are not required if complete Installation Kit MC-549 is available.

b.) Items contained in Installation Kit MC-549 are listed below:

Quantity

 Stock No. Item
1   Antenna Assembly RC-293, including 2 telescoping aluminum masts (extended length 25 feet), and 2-guy assemblies, with stakes and polystyrene insulator attached.
300 feet 1A148 Wire W-148, on spool.
1 6R36026 Tape, steel, measuring. 100-foot.
1   Bag BG-193 for storage of Antenna Assembly RC-293.
1   Bonding jumper, 10".
2   Bonding jumper, 8".
3 6J952/B10 Bracket (5-gal container). for drum, inflammable liquid.
1   Bracket. shield, for insulator protection on Radio Transmitter BC-610-( ).
2   Bracket, for mounting Radio Transmitter BC-610-( ).
2   Bracket, for mounting Antenna Tuning Unit BC-939-( ).
4   Bracket, for mounting Power Unit PE-75-( ) in trailer.
4   Bolt (U-type), for mounting Power Unit PE-75-( ) in trailer.
1 2Z1119 Box BX-19-A, for receiver spare tubes.
2   Block, wood, 3/4" x 2" x 5" (any available hardwood).
5 feet lF425-8 Coaxial Cable RD-8/U
1   Chain, 6".
2   Chain, 30". length, size 5/0, 1/4" stock, 7 links per foot electric welded, polished.
2   Chest end, plywood, 12 1/8" x 17" x 1/2", for stowage chest.
1 6Q19095 Chest CH-77, for tool equipment.
1   Chart, contents (plastic), for stowage chest in trailer.
1   Chart, contents (plastic), for stowage chest in vehicle.
1 2Z3375 Cover BG-75-A, for Radio Receiver B2-( ).
10 feet 3E-2141 Cord CO-141, power cord for BC-610-( ), includes spare length.
1   Cover, for Radio Transmitter BC-610-( ).
1   Cover, for Antenna Tuning Unit BC-939-( ).
1   Cover, for Mast Base MP-47-A.
1   Cover, for Power Unit PE-75-( ) in vehicle.
1   Cover, for stowage chest in vehicle.
2   Conncctor (BX-type), for outlet box.
4   Corner reinforcement, for stowage chests,.No. 67A116-B Hallicrafters Co., or equal.
4   Corner reinforcement, for stowage chests, No. 67A113-A Hallicrafters Co., or equal.
2   Fastener assembly, cast anchor.
28 2A1200.3 Footman's loop, 1" japanned, for top straps.
1   Gasket, spares for Mast Base MP-47-A.
2   Gasket, spares for Mast Base MP-47-A.
2   Gasket, spares for Mast Base MP-47-A.
1   Hardware kit.
9   Hook (clothes line type cast iron plate 2" x 2" with 2 1/8 projection), cadmium-plated.
2 3G621 Insulator IN-121, 1 in use, 1 running spare, for insulating antenna lead-in through canvas top of vehicle.
2   Insulator, spares for Mast Base MP-47-A.
1 2A2082 Mast Base MP-22, for receiver.
2   Mounting, for mounting Antenna Tuning Unit BC-939-( ).
4   Mounting (snubber), (Item 5, figure 40).
1   Outlet Box, 3 1/4 " octagon, 1/2" deep.
1   Platform, for mounting Radio Receiver BC-342-( ).
2   Plate, reinforcing for mounting Antenna Tuning Unit BC-939-( ).
8   Plate, strap, for stowage chest.
2 3H4575 Power Unit PE-75-( ), 1 in use for vehicle and 1 auxiliary for trailer.
1   Receptacle, with 3 1/4" cover, for outlet box.
1   Relay control box, includes hardware.
1 2Z7621.2 Relay.
2 2Z8056 Roll BG-( ).
6   Snap, 1 1/2".
2   Strap.
2   Strap and buckle, No. 14A053-A Hallicrafters Co.
3   Strap and tip.
1   Strap and buckle, No. 14A076-X Hallicrafters Co.
1   Top, canvas, for vehicle.
5   Turnbuckle assembly, 7 1/2" length closed, eye and eye type, rods 3/8-16.
15 feet 1B128 Wire W-128, for interconnection of relay box.

 

Figure 36: Installation of Radio Set SCR-499-( ) in Truck, 1/4-Ton, 4 x 4

 

Figure 37: Installation of Radio Set SCR-499-( ) in Truck, 1/4-Ton, 4 x 4 Trailer and spare parts

21 Modification of Components
a.) Chest CH-88-A.
Cut Chest CH-88-A in two sections and make the sections into two separate chests for storage of spare parts by adding plywood end pieces and hardware. Install larger chest in 3/4-ton trailer and smaller chest in Truck, 1/4-ton, 4 x 4. Installation Kit MC-549 contains plywood ends, metal corners, and hardware for modification. Perform the modification as follows:

(1) Refer to figure 39. Remove sliding doors on front of Chest CH-88-A. Remove shelves from compartments on left half of chest and two vertical partitions (second and third from left end of chest). Cut left section of chest to 14 5/16-inch length as shown in detail 10. Cut right section 'of chest to 35-inch length as shown in detail 11.

(2) Replace vertical partition at ends with two pieces of plywood supplied with installation kit. Secure with wood screws provided. Place provided metal corners on chest sections as shown in details 10 and 11, figure 39. Remove handle from end of small section, and place on end of large section.

(3) Cut two 7-inch lengths from one door of  Chest CH-88-A and use sections to make sliding doors for small chest. Cut sections of doors remainig to make doors for larger chest, as shown in detail 11, figure 39. Replace shelves in chests.

(4) Place proper charts of contents on chest doors. Install doors on chests, and place small chains as shown in details of figure 39.

(5) When this installation is made without Installation Kit MC-549, make length of chest sections 14 5/16 inches and 35 inches. Cut two pieces of plywood as shown in detail 12, figure 38. Place ends in chest sections as above, and use partitions provided to support shelves. Remove necessary metal corners, turnbuckle assemblies, escutcheon eyes, snap hooks, and chains from other- chests provided with Radio Set SCR-499-( ) that are not used in the installation, and install on two halves of Chest CH-88-A as shown in figure 39.

Figure 38: Brackets and contents chart, details

 

Figure 39: Installation of Radio Set SCR-499-( ) in Truck, 1/4-Ton, 4 x 4, modifications

b.) Power Unit PE-75-( ).
Refer to detail 7, figure 39. Cut ends of frame assembly as shown, in order to mount power unit on bumper of truck. Perform this modification on both power units so that they may be interchanged.

c.) Radio Transmitter BC-610-( ).
(1) Drill holes in cabinet of transmitter as shown in details 1 and 2, figure 39. Cut winghead bolts as show, in detail 4, figure 39.

(2) Prepare a coaxial antenna lead as shown in detail 3, figure 39. Prepare a wire antenna lead as shown in detail 5, figure 39, using Wire W-28.

(3) If an early type Radio Transmitter BC-610-( ) is received with sides of cabinet, not reinforced with steel straps, refer to figures 41 and 42 and apply reinforcing straps as directed on drawings.

d.) Radio Receiver BC-342-( ).
Refer to detail 8, figure 39 and drill cabinet of receiver as indicated. Secure keying relay box to receiver cabinet as shown in detail 12, figure 39.

e.) Truck 1/4-Ton, 4 x 4.
(1) Remove following items from truck, to reduce weight:
rear bumperettes, horn, spare wheel and tire, rear seat and scat frame, rear view mirror, lifting handles, and windshield.

(2) Remove holder for 5-gallon gasoline drum, located on left rear of vehicle, and attach holder to right rear of vehicle.

(3) As shown in figure 40, cut two slots through floor of vehicle for brackets, item 2 (detail 5, figure 38). Install brackets in position shown with hard ware provided. These brackets will support front of shock mount on Radio Transmitter BC-610-( ).

(4) Perform all necessary drilling as shown in figure 40.

Figure 40: Installation of Radio Set SCR-499-( ) in Truck, 1/4-Ton, 4 x 4, holes and brackets

f.) Trailer, Bantam, 1/4-Ton
(1) Perform all drilling as indicated in figure 37.

(2) Secure straps in place with hardware provided as shown in figure 37.

(3) When this installation is made without Installation Kit MC-549, necessary straps may be obtained from other chests supplied with Radio Set SCR-499-( ).

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