Chapter 2. Outdoor Installations
Vol. III-2-6 Alcatel-Lucent
• Where possible, the same ‘above and below’ relationship of the feed ports
should be used at both ends. For example, if at one end the vertical feed port is
located above the horizontal port, then the same relationship should be used at
the other end.
ODU Rotator Procedure
If the ODU rotator is not set for the required polarization, you must adjust its
orientation. This topic describes typical adjustment procedures for Andrew and
Radio Waves antennas.
Procedure for Andrew Rotator
To change the polarization of the Andrew antenna:
1. Release (do not completely undo) the six metric Allen-head screws
approximately 10 mm (3/8 inch). Pull the collar forward and hold the rotator
back, which will allow the rotator to disengage from a notch in the collar, and
turn freely.
2. Turn the rotator hub 90° until it locates back into a notched “timing recess” in
the collar.
3. Check that the timing mark on the rotator hub has aligned with either a V or
an H on the collar to confirm polarization. Refer to Figure 2-6 on page 2-6.
4. Ensure the rotator hub is correctly seated within its collar, then push the collar
back against the antenna mount and re-tighten the six screws.
Figure 2-6. Andrew ODU Collar and Polarization Rotator
Rotator
Vertical Polarization Horizontal Polarization
Timing mark on rotator hub
aligned with V on collar
Collar Timing mark on rotator hub
aligned with H on collar
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