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Operation and Maintenance
2.1
SELECTING THE INSTALLATION SITE
The area in which a DVOR is to be installed is determined by the responsible Civil Aviation Authority
according to the international air traffic regulations. This area is generally sufficiently large to allow
a point with the optimum topography and thus the optimum propagation conditions to be choosen.
This point is determined by means of a site survey at which a surveyor must always be present. ANS
can provide an engineering consultant on site for this survey. When the installation site has been de
termined precise bearings must be taken, either with reference to trigonometrical points or - if a satel
lite receiver is available - via satellite radio for increased precision.
Individual tree with height up to 12 m
Group of trees
Telephone lines
Buildings with metallic content
Radial power lines up to 10 kV
Shrubbery, wire fences up to 1.20 m
Sheds, individual trees with heights 7 m
type h = 3 m
TOP VIEW
Ä Ä Ä Ä
Ä Ä Ä Ä
Ä Ä Ä Ä
Ä Ä Ä Ä
vegetation below
counterpoise height
no metallic objects
power lines h<5 m
radial
power lines
Fig. 2-1
DVOR siting criteria (general data)
Ed. 01.04
CHAPTER 2
INSTALLATION
100 m
terrain slope
terrain slope
<2,3%
<4%
r100 m
r200 m
group of trees
<7°
h<10 m
h<7 m
h<0.9 m
<10°
wire fences
h<1.8 m
metallic buildings
h<3.5...5.5 m
h<10 m
2,5°
2°
Power lines <10 kV
if horizontal spread <10°
1,5°
Dense forest.
1°
Buildings with metallic content
0,5°
Metallic buildings (hangars)
200 m
terrain slope
300 m
<8%
r300 m
h<12 m
forest
h<8 m
DVOR 432
Installation
terrain slope not specified
2-1
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