cias PYTHAGORAS2 Series, Installation Manual, Page: 43 / 76

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CIAS Elettronica S.r.l. Ed. 1.1
Installation Manual Page 42 of 70 PYTHAGORAS 2
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
1 0
1 2
1 4
1 6
1 8
2 0
2 0 4 0 6 0 8 0 1 0 0 1 2 0 1 4 0 1 6 0 1 8 0 2 0 0 2 2 0
M a xim u m
sensitivity (”F ”)
H a lf ra n g e
s e n s itive z o n e
d ia m e te r [m ]
R a n g e [m ]
M in im u m
sensitivity (”0”)
Figure 3
Dimensions of the sensitive zone at the mid-point for PYTHAGORAS2 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.
.
2 0
3 0
1 0
4 0
5 0
6 0
7 0
8 0
9 0
1 0 0
2 0
3 0
1 0
4 0
5 0
6 0
7 0
8 0
9 0
1 0 0
1 2 3 4 5
6
7 8 9 1 0
A n te n n a c e n tre
d is ta n c e fro m th e
g ro u n d (c m )
M a x im u m
S e n s itivity (F )
L e n g th o f
d e a d z o n e (m )
M in im u m
S e n s itivity (0 )
Figure 4 Length of the dead zone near the equipment for PYTHAGORAS2 based on the
distance of the centre of the antenna from the ground and on the sensitivity setting