Installation Manual Part 3

PRELIMINARY
7-41
BWX 8415 Basestation Installation and Commissioning Guide
OL-19519-01
Chapter 7 Commissioning
7.7.3 Calibration Procedure
To determine if a problem exists, use the following information:
• At the BS console, look at the cal error message. The calibration should pass without any errors.
• Look at the Transmit Gain values. They should be relatively close to each other (values: 1 - 64).
• Find the median Transmit Gain value. The median is the value that falls in the middle of the
lowest to highest values. Example: If you ordered the values 9, 8, 8, 7, 7, 6, 5, 4, 3, 3, 3, 2, 1,
1….the median would be 5 because 5 falls midway from the top or bottom of the ranked values.
• Compare all the other Transmit Gain values to the median value. All Transmit Gain values
should be within a plus or minus range of 6 units from the median. Therefore, if the median is
50, values from 44 to 56 would be acceptable.
• Look at the Receive Gain values. (values: 115 – 255)
• Find the median Receive Gain value.
• Compare all the Receive Gain values to the median value. All Receive Gain values should be
within a plus or minus range of 8 units from the median.
Criteria:
Transmit Gain Words +/- 6 from the median value
Receive Gain Words +/- 8 from the median value
If this is a new installation (or a problem is found), repeat the calibration procedure (Steps 4-8). This
will be the second of three calibrations you will perform. Click on the Configure button for this BS, and
a new window appears (
Figure 7-47). The main “Show” window still shows the results of the first
calibration. The Configuration window shows the values corresponding to the second calibration.
Figure 7-47 Second Calibration (if needed)