CIAS Elettronica S.r.l.
Ed. 1.1
Installation Manual
Page
45
of
76
PYTHAGORAS 3
2.6 Amplitude of the MW Sensitive Beam
The dimensions of the sensitive beam is based on the sensitivity setting of the barrier.
The following figure gives the dimensions at the middle-point of the sensitive zone, as a
function of the length of the zone for maximum and minimum sensitivities.
2
4
6
8
10
12
14
16
18
20
20
40
60
80
100
120
140
160
180
200
220
Maximum
sensitivity (”F”)
Half range
sensitive zone
diameter [m]
Range [m]
Minimum
sensitivity (”0”)
Figure 3
Dimensions of the sensitive zone at the mid-point for PYTHAGORAS3 100-160 (open field)
2.7 Length of the Dead Zones near the equipment
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
Antenna centre
distance from the
ground (cm)
Maximum
Sensitivity (F)
Length of
dead zone (m)
Minimum
Sensitivity (0)
Figure 4 Length of the dead zone near the equipment for PYTHAGORAS3 based on the
distance of the centre of the antenna from the ground and on the sensitivity setting
