Checking The Antenna Connection By Using A Drive Tester; Measuring The Output Power Of The Trx - Huawei BTS3900 GSM Commissioning Manual

7 Commission the Antenna System
Step 4 Repeat
connected properly.
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7.2.2 Checking the Antenna Connection by Using a Drive Tester

This describes how to check the antenna connections by using a drive tester. You can determine
the antenna connection conditions by checking whether the frequencies of the BCCH and BSIC
in the configuration data are consistent with the actual frequencies and whether the test level is
normal.
Prerequisite
A drive tester and a test MS are available.
Procedure
Step 1 Record the longitude and latitude of the BTS in the drive test map.
Step 2 Start the drive test in the direction of the main lobe of the antenna in the target cell.
Step 3 Record the actual frequencies of the BCCH and BSIC in the cell. Compare the records with those
in configuration data of the BTS to ensure consistency.
Step 4 Check whether the test level is normal. The normal test level ranges from –48 dBm to –96 dBm.
After the drive test is complete, back up the BTS data configuration file.
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7.3 Measuring the Output Power of the TRX

This describes how to obtain the output power of the TRX, which indicates the operating status
of the BTS3900. You need to check the output power of only the TRX that transmits power on
all timeslots.
Procedure
Step 1 Measure the output power of the TRX on the ANT port of the DRFU by using a power meter.
Step 2 Check whether the output power of the TRX is within the normal range.
7-4
NOTE
To ensure the accuracy of test results, do as follows:
Make test calls within the power range of less than –30 dBm to -70 dBm under the tower.
l
Perform the dialing test for more than five times.
l
Step 2 through Step 3
CAUTION
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to check the antennas on all the frequencies of the BTS are
BTS3900 GSM
Commissioning Guide
Issue 03 (2008-07-15)