Alcatel-Lucent 9500 MXC User Manual page 310

Chapter 5. Antenna Alignment
Vol. III-5-10
Checking Feedhead Flange with a Spirit Level
Figure 5-1.
• If not exactly vertical or horizontal, adjust the feedhead skew angle (rotate
the feedhead) until correct (spirit level bubble is precisely centered). For a
typical feedhead check both flanges for level, using an end point half way
between the level points of the two flanges should there be any discrepancy
between the two.
2. Align Antennas
Align the antennas at both ends using the standard (co-plane) alignment
procedure, but using just one of the feeds, V or H. Refer to Standard
Alignment Procedure on page 5-5.
If major adjustment to the pointing of the antenna is made during this
process, recheck the feedhead skew angle.
When correct, proceed to step 3.
3. Check RAC 40 Operation and End-End Feedhead Alignment
Power-up both V and H RAC 40 links and check they are operating normally
and are alarm-free. Use the Performance screens to check that:
• Tx power measurements are within 1 dB (typically) on all RACs. If not
check Tx power settings.
• RSL measurements are within 2 dB an all RAC 40s. See Using RSL Data on
page 5-2 for guidance on measurement accuracy.
• Links are operating error-free.
Where there is potential for interference from other links in the same
geographical area, check by turning the far end transmitter(s) off and measuring
the local end RSL on both V and H feeds.
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