Alcatel-Lucent 9500 MXC, User Manual, Page: 251 / 916

9500 MXC User Manual
3DB 23063 ADAA - Rev 004 July 2007 Vol. III-2-9
Direct-Mount ODU Attachment Procedure
This topic describes the physical attachment of an ODU to an antenna mounting
collar.
Related procedures are:
• Installing the ODU Lightning Surge Suppressor; refer to Installing Lightning
Surge Suppressors on page 2-23. This is only required for ODUs not fitted with
an internal lightning surge suppressor.
• Grounding an ODU; refer to Grounding the ODU on page 2-13
• Installing the ODU cable and connectors; refer to Installing ODU Cables and
Connectors on page 2-19
Attaching the ODU
An ODU should be installed with connectors facing down.
To attach the ODU:
1. Check that the ODU mounting collar, polarization rotator, ODU waveguide
feed head and O-ring, are undamaged, clean, and dry.
2. Set the polarization rotator for the required polarization. Refer to Setting the
Polarization on page 2-5.
3. Apply a thin layer of silicon grease around the ODU feed-head O-ring.
4. Fully loosen the nuts on the four ODU mounting bolts.
5. Position the ODU so the waveguide slots (ODU and rotator) will be aligned
when the ODU is rotated to its end position.
6. Fit the ODU onto its mounting collar by inserting the bolts through receptor
holes in the collar, then rotate the ODU clockwise to bring the mounting bolts
hard up against the slot ends.
7. Carefully bring the ODU forward to fully engage the ODU feed head with the
polarization rotator.
8. Finger-tighten the four nuts, checking to ensure correct engagement of ODU
with mounting collar.
9. Ensure the ODU bolt-down points are correctly seated, then tighten the four
nuts with an open-ended 19 mm (3/4”) spanner.
A tube of silicon grease is included in the ODU installation kit.