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INTERNAL
Document No. Product Version Confidentiality Level
OptiX RTN product series Page
Guide to Antenna Commissioning
(INTERNAL)
Prepared by Xing Zibin Date 2009-03-30
Reviewed by Date yyyy/mm/dd
Approved by Date yyyy/mm/dd
Huawei Technologies Co., Ltd.
All Rights Reserved
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Guide to Antenna Commissioning INTERNAL
History
Date Version Description Author
2009-03-
30
1.00 Completed the initial draft. Xing Zibin
2009-04-
20
1.10 Added figures. Xing Zibin
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Chapter 1 Aligning the Single-Polarized
Antennas
When you align the single-polarized antennas, you need to align the main lobes of
the antennas by adjusting the azimuth and elevation of the antennas at both ends.
1.1 Prerequisites
The prerequisites for aligning the single-polarized antenna are as follows:
The NE commissioning of the radio equipment at both ends of the radio link
must be complete.
The weather should be favorable for outdoor work. There should be no rain,
snow, or fog between the two stations.
The on-site conditions must meet the requirements for the antenna to operate
at a high altitude and the personnel required to commission the antenna must
be trained to work at heights.
The ATPC function must be disabled.
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The AM function must be disabled in the case of the Hybrid mode. The radio
work mode must be set to the QPSK modulation scheme.
1.2 Tools, Equipment, and Materials
Wrench, telescope, interphone, Allen wrench, multimeter (with a BNC connecter
prepared at one end for future tests), compass.
1.3 Precautions
If the radio link is configured in 1+1 protection mode and one antenna is used
at each end, power off the standby ODUs at both ends before aligning the
antennas. After the antennas are aligned, power on the standby ODUs at both
ends.
If the radio link is configured in 1+1 SD mode, align the antennas as follows:
1) Power on the active ODUs at both ends. Ensure that they are powered on
during the alignment.
2) Power on the standby ODUs at both ends. Then, adjust the main antennas at
both ends.
3) Power on the standby ODU at the local end. Retain the position of the main
antenna at the remote end, and adjust the diversity antenna at the local end.
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4) Power on the standby ODU at the remote end. Retain the position of the main
antenna at the local end, and adjust the diversity antenna at the remote end.
If the radio link is configured in 1+1 FD mode and two antennas are used at
each end, align the antenna as follows:
1) At both ends, power on the main ODUs, power off the standby ODUs, and
align the main antennas.
2) At both ends, power off the main ODUs, power on the standby ODUs, and
align the diversity antennas.
Note:
You can adjust the azimuth and elevation of the antennas by adjusting thecorresponding nuts or screws. For details, see the related installation guide.
1.4 Procedure
1) Determine the azimuth of the antenna according to the installation position and
height of the antenna. Then, adjust the elevation of the antenna to the
horizontal position.
2) Connect a multimeter to the received signal strength indicator (RSSI) port on
the ODU at the local end and measure the voltage value VBNC.
It is recommended that you prepare a test line terminated with a BNC connector at
one end before performing the test. The test line can help measure the voltage
value VBNC.
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Figure 2.1 Measuring the RSSI voltage by using a multimeter
1) Adjust the azimuth and elevation of the antenna as follows:
a. Retain the position of the main antenna at the remote end.
b. Use the multimeter to measure the VBNC.At the local end, rotate the antenna to
a great extent in the horizontal direction.
When you rotate the antenna, the tested signal peaks may be as follows:
Three signal peaks are tracked, for example, line AA' in Error: Reference
source not found . In this case, adjust the azimuth of the antenna to the peak
position at point 2 as shown in Error: Reference source not found . Two signal
peaks are tracked, for example, line BB' in Error: Reference source not
found . In this case, adjust the azimuth of the antenna to the middle of points 4
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and 5 as shown in Error: Reference source not found . Then, adjust the
elevation of the antenna so that the three signal peaks in the case of line AA'
can appear. Adjust the antenna to the peak position at point 2 as shown in
Error: Reference source not found .
One signal peak is tracked, for example, line CC' in Error: Reference source
not found . In this case, adjust the azimuth of the antenna to the middle of
points 6 and 7 as shown in Error: Reference source not found . Then, adjust
the elevation of the antenna so that the three signal peaks in the case of line
AA' can appear. Adjust the antenna to the peak position at point 2 as shown in
Error: Reference source not found .
c. Slightly adjust the elevation and azimuth at point 2 as shown in Error:
Reference source not found until the VBNC reaches the peak within the tracked
range.
d. Adjust the antenna until the VBNC voltage reaches the peak value. Then, fix the
antenna at the local end.
Figure 1.1 Aligning the azimuth of the 0.6 m antenna
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Nuts that fixthe clamps
Leveladjustmentscrew
Bolt onthe standbase
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Figure 1.2Aligning the elevation of the 0.6 m antenna
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Bolts that connect
the antenna andthe stand
Elevationadjustment bolt
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Note:When you fix the antenna, ensure that the VBNC voltage remains the peak value.
2) Repeat Steps 23 to adjust the antenna at the remote end. When the remote
received signal level (RSL) reaches the peak value, fix the antenna at the
remote end.
3) Repeat Steps 24 for two to four times. When the RSL at the local end and the
RSL at the remote end reach the peak value, fix the antennas at both ends.
4) Use the multimeter to test the VBNC voltage at both ends. Obtain the current
RSL by referring to the relation curve between the VBNC of ODUs and the RSLs
at both ends.
NoteThe curve diagram of the VBNC and the RSL is contained in the carton of the ODU.
For example, the curve diagram of the VBNC and the RSL of the 15 GHz ODU A is
as follows.
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Figure 4.1 The actual receive power of the ODU is within the calculated power
range +/-3 dB.
NoteIf the actual receive power of the ODU is beyond the calculated power range +/3
dB, the ODU indicator on the IF board blinks yellow every 300 ms. If the received
power is within the calculated power range +/3 dB, the ODU indicator is off.
If the VBNC does not meet the requirements, refer to the OptiX RTN 600 Radio
Transmission System IDU 610/620 Maintenance Guide for troubleshooting.
5) Fix all the screws of the antennas.
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