User's Manual

48/346 Issue 01 - April 2001 - Draft 04 3CC12426AAAA TQ BJA 01
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1. Place a digital level on the top of the X-Pol RBS Tx or X-Pol RBS Rx antenna (see Figure 18).
2. Loosen the two antenna bolts to allow free movement of the antenna.
3. While observing the digital level, adjust the downtilt adjustment screw (see Figure 18) until the
downtilt meets the angle required by cell planning analysis.
Figure 18 – Antenna downtilt adjustment screw
4. Tighten the two antenna bolts to 54.4 Nm, ± 2.7 Nm (40 ft-lb, ± 2 ft-lb) of torque.
5. Check the digital level to ensure that the antenna is adjusted to the correct downtilt angle. If the digital
level indicates an incorrect downtilt angle, repeat the procedure.
2.5.4 – Replacing an X-Pol RBS Tx, X-Pol RBS Rx or antenna
When X-Pol RBS Txs, X-Pol RBS Rxs or antennas malfunction, they must be serviced by removing the
malfunctioning unit (X-Pol RBS Tx/X-Pol RBS Rx or antenna), and then replacing it with a new unit. The
malfunctioning unit should be packaged and sent to Alcatel for repair.
X-Pol RBS Txs and X-Pol RBS Rxs must not be replaced or serviced while still connected to antennas
that are mounted on a pole. Disconnect power from the IF cables by switching off the appropriate
breaker, and disconnect the IF and RS-422 cables from the X-Pol RBS Tx or X-Pol RBS Rx. Remove
the antenna from the mounting plate before any replacement or servicing.
To replace an X-Pol RBS Tx, X-Pol RBS Rx or antenna
1. To remove –48 V dc power from the X-Pol RBS Tx or X-Pol RBS Rx IF cable, switch off the
appropriate circuit breaker on the power distribution system.
Digital level
Antenna bolt
Antenna downtilt
adjustment screw
Pole
Antenna
bolt