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Installation wizard
Figure 5-37 Step 6: Configuration Complete page (step 5 cancelled)
Step 6: Aligning antennas
Perform this task to align the antennas. Antennas are aligned by monitoring ODU
output voltage and receive power.
Licensed microwave links use parabolic dish antennas which have narrow beam
widths ranging from 4.7° down to 0.5°. This depends on antenna gain, larger gain
antennas having narrower beam widths. It is most important that all PTP 800
antennas are precisely aligned at the centre of the main beam. If antennas are not
aligned at the centre of the main beam, performance will be dramatically reduced.
The alignment process requires the elevation angle (vertical plane) and azimuth
angle (horizontal plane) to be adjusted. Antenna assemblies provide a mechanism
for independently adjusting in both planes whilst the antenna mounting bracket is
securely mounted to the mast. Please refer to the instructions provided with the
antenna.
Alignment is achieved by monitoring the receive signal strength indicator (RSSI).
This is provided at the ODU BNC socket in the form of a dc voltage (RSSI Voltage).
CAUTION
5-102
During the alignment process, ensure that antenna waveguide and
coaxial components are not strained beyond their minimum bend radii.
Chapter 5 Installation
.
phn-1478_005v000
Apr 2010
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