TM 11-5840-281-12-1
4-5.
SITE AND SHELTER REQUIREMENTS. (CONT)
Air traffic patterns and flow
Routing of interconnecting cables
Positioning of power supplies
Location of control-indicator groups
Applicable governing regulations and standard operating practices (SOP)
Equipment siting limitations
TERRAIN
It is essential that radar set group be kept level at all times so that antenna tilt information and preset cursor alinements
will remain accurate in any direction. Select a radar site that is level, well drained, and firm enough to support weight of
radar set group. Leveling adjustments in leg of antenna pedestal can compensate for an Incline of 2.5 degrees
maximum. Use a concrete slab or wooden planks to keep radar set group level in a permanent or semipermanent
configuration. In a tactical situation, use ground anchors and tiedown straps. Location of structures such as taxiways
and drainage culverts will influence radar site selection. Whenever possible, select a radar site that is at same ground
level as td. If the radar site elevation is higher than td, the ground angle between the two must not exceed -1 degree.
When the radar site elevation is lower than td, the limiting factor is radar coverage as described in Line-of-Site
Obstructions.
LINE-OF-SITE OBSTRUCTIONS
Radar set operates in that part of the frequency spectrum that exhibits line-of-site propagation. Therefore, any part of the
area that cannot be viewed from the radar site will also be "blind" to radar. It is thereby essential that radar set group
have an unobstructed view of the area to be covered by radar. Complete azimuth and elevation radar coverage is
always desired; however, objects such as trees, buildings, and hills will sometimes obscure low-level coverage in some
azimuth bearings. Give special consideration so these objects do not obscure the azimuth sector containing the final
approach area, the entrance to final approach area, and the radio frequency aids-to-navigation pickup points.
ACCESSIBILITY
Select a radar site and operating site that will permit access by personnel and equipment for maintenance and primary
power generator refueling. Route interconnecting cables so that they are out of the way or protected from heavy
equipment traffic.
TRAFFIC PATTERNS AND FLOW
Radar siting requirements become more stringent when approaches to more than one runway of an airfield are used. In
multiple runway coverage, traffic patterns and maximum traffic flow determine the location of radar set group. If one
runway is designated as the primary gca runway, it should be given adequate coverage even at the expense of the other
runway approaches.
APPLICABLE REGULATIONS
Select and locate the radar site in accordance with applicable regulations and standard operating procedures. Be sure
that any limits or restrictions on radar equipment and the site selected are not violated without proper authority.
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