CHAPTER 2. INSTALLATION - TM-11-5820-509-120017

TM 11-5820-509-12

CHAPTER 2

INSTALLATION

WARNING

During installation of this equipment, conform to all safety requirements set forth in TB

SIG 291. Serious injury or DEATH can result from failure to comply with these safety

practices.

Section I. SERVICE UPON RECEIPT OF EQUIPMENT

2-1. Siting Instructions

Some of the factors that must be taken into consideration

be taken to operate the equipment in a clear, dry, cool

when selecting a suitable operating site for a radio set

area having as little vibration as possible. If internal

installation are as follows:

maintenance is to be performed, a dust-free maintenance

a. When using the antenna-ground plane in the

area is urged. Refer to paragraph 1-7 which provides all

portable configuration, a site must be sufficiently clear of

essential equipment dimensions necessary for installation.

natural and manmade obstacles to permit all eight wire

2-3. Packaging Data

radials to be extended uniformly in all directions around

Radio Set AN/PRC-47 is packaged for shipment in two

the equipment for their entire length.

containers. The radio set carton (minus the electrolyte) is

b. When the long-wire antenna is used, the selected site

shown in figure 2-1.

The electrolyte is packaged

must have a clear area sufficiently large to accommodate

separately in a smaller carton and is referenced in TM 11-

the entire 45 feet of wire without coming near any metal

6140-208-15.

objects. If point- to -point communication between fixed

2-4. Unpacking Instructions

stations is planned, orient the antenna perpendicular to

The receiver-transmitter assembly is shipped fully

the path of transmission.

assembled with all fuses, vacuum tubes, modular

c. Transmitted signals have a greater range when the

subassemblies, and crystals installed. The battery is in the

antenna site is as high as possible above surrounding

same container, but it is shipped without any electrolyte

objects. Avoid erection of the antenna or the transmitter

(dry charged). A separate container, suitably marked, is

site close to surrounding metal objects such as reinforced

used to ship the potassium hydroxide electrolyte. Carefully

steel buildings, bridges, telephone or electric wire or

unpack the radio set and its accessories as follows:

cables, rail yards, or other large structures.

a. Unpacking Procedures, Radio Set Carton. Unpack

d. When omnidirectional operation is desired, place the

the carton (fig. 2-1) containing the AN/PRC-47 as

antenna at the highest available location within the

follows:

selected site. If the long-wire antenna is to be used, erect

CAUTION

it as near to the vertical as possible.

Open this carton carefully to avoid

e. Electrical interference may be avoided by choosing a

damage to equipment finish, packing

site as far away as possible from powerlines, telephone

material, and packing lists in the carton.

lines, radar sites, and automobile highways.

(1) Place the carton in an upright position with the

2-2. Shelter Requirements

taped top clearly accessible.

Since the radio set is watertight when Cover Panel, CW-

(2) Remove the tape from the lid, and open the

647/PRC-47 is in place and remains splashproof when

carton.

this panel cover is removed, no special shelter

(3) Remove the top corner blocks, desiccant, and

considerations are required. Because of the precision

technical manuals.

required in operating frequencies using single-sideband

(4) Carefully lift Case, Radio Set

and teletypewriter modes, a modest amount of care should

2-1