©
CIAS Elettronica S.r.l.
Ed. 2.4
2.6 Dimensions of the MW Sensitive Zone
The dimensions of the sensitive zone is a function of the sensitivity setting of the barrier.
The following figure gives the dimensions at the mid-point of the sensitive zone, as a function of
the length of the zone for maximum and minimum sensitivities.
1
2
3
4
5
6
7
8
9
10
10
20
30
40
50
60
70
80
90
100
Dimensions of
sensitive zone
at mid-point (m)
Maximum
Sensitivity
Length of
Zone (m)
Minimum
Sensitivity
Figure 3 Dimensions of the sensitive zone at the mid-point for PYTHAGORAS 100 (open field)
2.6 Dimensions of Dead Zone close to units
The dimensions of the dead zone close to the units is a function of both the height of the units
above the ground and the sensitivity setting of the Receiver (figure 5).
The recommended
height for a standard installation is approximately 80 cm
, dependent on the requirements of
the system. The measurement is from the centre of the antenna to the ground.
With average
sensitivity the minimum crossover distance should be 3.5m each.
20
30
10
40
50
60
70
80
90
100
20
30
10
40
50
60
70
80
90
100
1
2
3
4
5
6
7
8
9
10
Height above
ground of centre
of antenna (cm)
Maximum
Sensitivity (F)
Length of
dead zone (m)
Minimum
Sensitivity (0)
Figure 5 Dimensions of the dead zone close to the units as a function of the height of the
centre of the antenna above the ground for PYTHAGORAS
Installation Manual
Page
33
of
56
PYTHAGORAS
