Installation Manual Part 3

PRELIMINARY
6-18
BWX 8415 Basestation Installation and Commissioning Guide
OL-19519-01
Chapter 6 Installation
6.3.7 Set the Downtilt
6.3.7 Set the Downtilt
Based on coverage objectives determined by previous RF planning, the AU may need adjusting upward
or downward once mounted on the pole, tower, roof, building, or other structure. The panel antenna has
a -6° built-in electrical downtilt.
You will use an inclinometer to read the mounted position and to determine what adjustments, if any,
need to be made. For example, if the inclinometer reads +2° (uptilt) and you are mounting an AU, the
resulting beam has a –4° downtilt (
Figure 6-18).
Figure 6-18 Downtilt Adjustment Example
The downtilt can be adjusted per the assembly shown in Figure 6-19
A
p
p
a
r
e
n
t
+
1
°
E
f
f
e
c
t
i
v
e
–
5
°
Electrical –6°
A
p
p
a
r
e
n
t
+
1
°
E
f
f
e
c
t
i
v
e
–
5
°
Electrical –6°
A
p
p
a
r
e
n
t
+
1
°
E
f
f
e
c
t
i
v
e
–
5
°
Electrical –6°
 The inclinometer reads +1 ° (uptilt)
A
p
p
a
r
e
n
t
+
1
°
E
f
f
e
c
t
i
v
e
–
5
°
Electrical –6°
A
p
p
a
r
e
n
t
+
1
°
E
f
f
e
c
t
i
v
e
–
5
°
Electrical –6°
A
p
p
a
r
e
n
t
+
1
°
E
f
f
e
c
t
i
v
e
–
5
°
Electrical –6°
 The panel antenna has a -6 ° built in
electrical downtilt
 The resulting beam has a -5
° downtilt
A
p
p
a
r
e
n
t
+
1
°
E
f
f
e
c
t
i
v
e
–
5
°
Electrical –6°
A
p
p
a
r
e
n
t
+
1
°
E
f
f
e
c
t
i
v
e
–
5
°
Electrical –6°
A
p
p
a
r
e
n
t
+
1
°
E
f
f
e
c
t
i
v
e
–
5
°
Electrical –6°
 The inclinometer reads +1 ° (uptilt)
A
p
p
a
r
e
n
t
+
1
°
E
f
f
e
c
t
i
v
e
–
5
°
Electrical –6°
A
p
p
a
r
e
n
t
+
1
°
E
f
f
e
c
t
i
v
e
–
5
°
Electrical –6°
A
p
p
a
r
e
n
t
+
1
°
E
f
f
e
c
t
i
v
e
–
5
°
Electrical –6°
 The panel antenna has a -6 ° built in
electrical downtilt
 The resulting beam has a -5
° downtilt