Commissioning The Antenna System; Measuring The Vswr - Huawei BTS3900 GSM Commissioning Manual

6 Optional Commissioning Tasks

6.1 Commissioning the Antenna System

This describes how to commission the antenna system. You must check whether the VSWR is
normal, whether the output power of the TRX is normal, and whether the antenna is connected
properly. If an RET antenna is configured, you need to commission it.

6.1.1 Measuring the VSWR

This describes how to measure whether the VSWR is less than or equal to 1.5. If the VSWR is
less than or equal to 1.5, the transmission of the antenna system is normal. To measure the
VSWR, perform the following steps where the Site Master is taken as an example.
6.1.2 Monitoring the Output Power of TRXs
This describes how to obtain the output power of the TRX, which indicates the running status
of the TRXs.
6.1.3 Checking the Antenna Connection
This describes how to check the antenna connections with an MS. You can lock the MS on a
cell frequency and perform the dialing test. If the MS dialing test is successful, the antenna is
properly connected.
6.1.1 Measuring the VSWR
This describes how to measure whether the VSWR is less than or equal to 1.5. If the VSWR is
less than or equal to 1.5, the transmission of the antenna system is normal. To measure the
VSWR, perform the following steps where the Site Master is taken as an example.
Prerequisite
The BTS is powered off.
Procedure
Step 1 Measure the VSWR at the antenna port by using the Site Master.
If...
The VSWR is less than or equal to 1.5 The transmission of the antenna system is
If the VSWR is greater than 1.5
Step 2 Use the Site Master to locate the fault point of the abnormal VSWR on the jumper or feeder.
When a fault point is found, check whether the connections are secure at the fault point, and
whether the connectors are intact. If the connector is faulty, replace it.
6-2
NOTE
If you have checked the VSWR before powering on the BTS, you do not need to perform this task.
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Then...
operational. Record the VSWR in the
Commissioning Record Data Sheet.
The transmission of the antenna system is faulty. Go
to Step 2.
BTS3900(A) GSM
Commissioning Guide
Issue 02 (2009-04-20)