TM 11-5895-846-14
e. Alternate site locations in the event unforeseen
2-5.
Site Area Briefing Data
difficulties are encountered with the primary site location.
The overall site is selected by the communications
f. The operating mode assignments for the
officer, and the operating crew is thoroughly briefed prior
terminal such as transmit and receive frequencies,
to departure for the site. The information given to the
power output, etc.
crew includes the following:
g. A procedure to be used in the event signal
a. Precise azimuth and elevation settings for the
contact is not made after the normal antenna alinement
antenna relative to the selected site location.
schedule has been completed.
b. Site area location and instructions for reaching
and identifying the site area.
c. Topographic maps of the area.
d. Details relative to exact equipment installation
position and site layout requirements.
Section II. SITE AND SHELTER REQUIREMENTS
c. Interference. As much as possible, the antenna
2-6.
Factors Affecting Site Selection
line-of-sight should not point directly towards nearby
electrical interference sources such as:
Prior to leaving for the site area, the crew should
(1) Power lines.
consider the following factors in their selection of the
(2) Electric generators.
specific site location. Also, they should assign priorities
(3) Hospital equipment.
as to the level of importance of these factors in meeting
(4) High speed computers.
the overall site requirements.
(5) Radar and other RF transmitters.
d. Other Factors.
Having one or both of the
a. Topography.
following factors included in the overall site requirements
(1) The specific site location should be within
is desirable, but not necessarily mandatory in the
20 nautical miles (32.2 km) of the general site area
selection of the specific site area.
selected at the briefing.
(1) Electric company power of 120/208 + 10%
(2) No natural or man-made obstructions shall
50/60 Hertz +5%, three-phase as an alternate/
be in the line-of-sight path between the antenna and
emergency power source.
satellite.
(2) Good road access to the site. However,
(3) A relatively clear area approximately 40
since the equipment is mobile, its strategic function
feet wide by 100 feet long (12.2m by 30.5m). The length
practically dictates there should be little or no traffic flow
dimension shall aline with the line-of-sight path as closely
to and from the site area.
as possible.
(4) Ground slope should not exceed 5.
2-7.
Shelter Requirements
b. Soil Conditions.
Building requirements for a permanent shelter are not
(1) Compact enough to support the weight of
applicable since the terminal equipment (except the
the equipment.
antenna) is housed and operated in a transportable
(2) Provide adequate holding for tie-down
shelter.
anchors and yet not be too rock-infested to prevent
secure anchoring.
(3) Avoid loose sand and marshy-type soil
having poor drainage characteristics and holding power.
Section III. SERVICE UPON ARRIVAL AT SITE
made. Factor priorities, then, should now be applied in
2-8.
Selecting the Site
choosing the specific site location.
NOTE
Refer to TM 11-5985-359-13 for
2-9.
Locating the Sighting Points (fig. 2-2)
planning and erecting the 20-foot
A preliminary determination is made as to the spacing
requirements for the equipment prior to locating the
sighting points. Also allow for a 60-foot long (18.3m)
Upon arrival at the selected area (per briefing session)
(approx) radiation hazard area in front of the antenna.
the crew will visually survey the area terrain. They will
Allow no more than 2 feet (0.6m) between the rear edge
base their final selection of a specific site location on the
of the 24-inch rear ground pad of the antenna and the
factors listed in paragraph 2-6. Ideally, the selected site
antenna entry panel on left-rear (roadside) sidewall of the
will meet all the listed requirements. But in the practical
shelter.
realm, a compromise of some factors may have to be
2-2
