User's Manual
Table Of Contents
1027145–0001 Revision D Installing ODUs 4–9Hub installation
9. Using the map, directional markings you have made on the
roof, the protractor, and landmarks, point the center of the
antenna toward the HT alignment direction (i.e., toward the
center of the sector, or coverage area) as you install the
antenna. (See figure 4-4. Installation instructions for the
antenna are covered in sections 4.4 through 4.9.)
Each sector is defined by a sector angle and coverage angle,
as illustrated in figure 4-4. However, to align the antenna,
you only need to know the assigned HT alignment
direction.
Figure 4-4 HT sector definition and terminology
This example
shows a single
sector for
a 45 ODU.°
hb082
Sector angle - Starting point for the
coverage angle, relative to 0° (north)
Coverage angle - Sector coverage (beamwidth)
HT alignment direction
+22.5
:
Sector angle 30.0
+ 1/2 coverage angle
= 52.5
°
°
°
52.5°
30°
Tr u e
north
0°
45°
Sector (shaded area)
ODU
22.5°
Keep the sector map and protractor handy. You will use
them as you physically install and align the antenna, as
explained in the following sections.