Performing Antenna Alignment For Xpic - Cambium Networks PTP 820 Series User Manual

Chapter 3: Configuration Guide
Figure 113 XPIC Edit Page
3. In the Admin state field, select Enable.
4. Click Apply, then Close. The XPIC group is enabled.

Performing Antenna Alignment for XPIC

1. Align the antennas for the first carrier. While you are aligning these antennas, mute the second carrier. See
Configuring the Radio Parameters.
2. Adjust the antenna alignment until you achieve the maximum RSL for the first-carrier link (the "RSL
This RSL should be no more than +/-2 dB from the expected level. Record the RSL of the first carrier as the
RSL .
wanted
3. Measure the RSL of the second carrier and record it as the "RSL
4. Determine the XPI, using either of the following two methods:
o
To calculate the XPI, subtract the RSLunwanted from the RSLwanted.
o
Read the XPI from the Modem XPI field of the Radio Parameters page in the Web EMS. See Viewing the
Radio Status and Settings.
5. The XPI should be between 25dB and 30dB. If it is not, you should adjust the OMT assembly on the back of the
antenna at one side of the link until you achieve the highest XPI, which should be no less than 25dB. Adjust
the OMT very slowly in a right-left direction. OMT adjustment requires very fine movements and it may take
several minutes to achieve the best possible XPI.
Note
As an extra step, to check the veracity of the initial measurements, you can mute the first carrier and
unmute the second carrier on the upper carriers on both sides of the link. Then measure the RSL of
the second carrier link (the "RSL
determine the XPI. The XPI should match the XPI with the second carriers muted.
unwanted
"), measure the RSL of the first carrier (the "RSL
wanted
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Configuring XPIC
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unwanted
").
wanted
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