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
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
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
selected site. If the long-wire antenna is to be used, erect
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
this panel cover is removed, no special shelter
(3) Remove the top corner blocks, desiccant, and
considerations are required. Because of the precision
required in operating frequencies using single-sideband
(4) Carefully lift Case, Radio Set
and teletypewriter modes, a modest amount of care should