User's Manual

Doc. No.
Rev.
Date
DRAFT
1.01
2012-01-27
Damm Cellular Systems A/S, Denmark
TetraFlex
®
7.5 Manual - BS41x Configuration
TetraFlex® 7.5 Manual 2-85
Set local blocking to off again
01- Local blocking off
2.7.12 Save BSC and TR configuration
The various settings are from TetraFlex® version 7.5 saved automatically when making
changes from BSC-GUI or OM-commands.
2.7.13 TMA/TMD installation adjustment
2.7.13.1 Introduction
This guide describes how to adjust the BS41x Tetra Base Station after installation of the
TMA412 RX Tower Mounted Amplifier. The instruction is also valid only if the TMD412 is
provided, as the TMD412 is identical to the TMA412 except for the additional Duplexer.
The TMA is to be connected with the BS using 3 shielded cables with a maximum insertion
loss of 8dB. The adjustment procedure requires the loss of all 3 feeders to be identical.
The adjustment is done to adapt the TMA to the selected output power of the TR and to
compensate the actual loss of the 3 feeders.
The TMA including feeder loss and AI411 input attenuation is recommended to run with a
pre-gain of 6dB. This has been chosen as a compromise between sensitivity and dynamic
range. It is not recommended to operate a higher gain.
Output power in analogue NMT/MPT mode is fixed to be twice the output power in Tetra
mode. The following equivalent input levels at the TMA input from the RFTL are
recommended:
Mode
RFTL level
TMA input (+6dB)
TR input
Analogue
High
-105dBm
-99dBm
Tetra
High
-108dBm
-102dBm
Analogue
Low (-10dB)
-115dBm
-109dBm
Tetra
Low (-10dB)
-118dBm
-112dBm
Note that RFTL low level (-10dB) is not supported in the first versions of the TR411.
2.7.13.2 Tools and Equipment
Operating the TetraOM System requires a PC to be connected to the BS, a screwdriver, and
a short test cable.