Measuring The Vswr At The Antenna Port; Checking The Antenna Connection - Huawei BTS3900 GSM Commissioning Manual
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Also See for BTS3900 GSM:
- Commissioning manual (129 pages) ,
- Installation manual (20 pages)
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7 Commission the Antenna System
7.1 Measuring the VSWR at the Antenna Port
This describes how to check the VSWR at the antenna port. If the VSWR at the antenna port is
less than or equal to 1.5, you can infer that the transmission of the antenna system is normal.
The Site Master is taken as an example to describe the procedure for measuring the VSWR.
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, You can infer that the transmission of the antenna
The VSWR is greater than 1.5,
Step 2 Locate the fault on the jumper or feeder where the VSWR is not normal by using the Site Master.
Check whether the jumper or feeder is securely connected and whether the connectors are in
good condition. If any connector is damaged, replace it.
----End
7.2 Checking the Antenna Connection
This describes how to check whether the feeders are misconnected by using a drive tester or
through a dialing test. If an RET antenna is configured, check whether the cables of the RET
antenna are connected properly.
7.2.1 Checking the Antenna Connection with an MS
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. Then, you can determine the antenna connection
conditions by checking whether the dialing test is successful.
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
7-2
NOTE
If you have checked the VSWR before powering on the BTS, you do not need to perform this task.
NOTE
The fault often occurs on the connectors between the jumper and the feeder or the connectors between the
jumper and the antenna.
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Copyright © Huawei Technologies Co., Ltd
Then...
system is normal. Record the measured value in the
Data Sheet for
Commissioning.
You can infer that the transmission of the antenna
system is not normal. Go to
BTS3900 GSM
Commissioning Guide
Step
2.
Issue 03 (2008-07-15)
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