Axell Wireless Limited
Technical Literature
UHF Dual Band Line Amplifier
Document Number 55-227901HBK
Issue No. 4
Date 23/06/2014
Page 22 of 30
4.4.
Commissioning
Once all connections are made the equipment is ready for commissioning.
To commission the system the test equipment detailed in Section 5.2. will be required.
Using the system diagrams and the end-to-end test specification (supplied with the equipment), the
equipment should be tested to ensure correct operation. Typical RF levels that are not listed in the
end-to-end specification, such as input levels to the fibre transmitters are detailed in the maintenance
section of this manual.
On initial power up the system alarm indicators on the front door of the equipment should be checked.
A green LED on the front door of the unit illuminates to indicate that the power supply is connected to
the unit
In the event that any part of the system does not function correctly as expected, check all connections
to ensure that they are to the correct port, that the interconnecting cables are not faulty and that they
are tightened. The majority of commissioning difficulties arise from problems with the interconnecting
cables and connectors.
4.5.
RF Installation & Gain Calculations
1. Ensure that the in-line amplifier gain is set to minimum. Measure the signal level from the
donor feeding cable and coupler to ascertain the RF input level and gain required.
Note: Ensure that the number of potential carriers is known for the operating band.
2. The equipment gain is set by setting the variable switched attenuators in each path (uplink
and downlink) refer to the photographs and layout drawings for the exact attenuator
locations). Note that the uplink (mobile to base) and downlink (base to mobile) path gains are
set independently. This allows the paths to have different gains if required to set the correct
output power levels.
3. It is recommended that the gains are set such that the Downlink channel output levels from
the equipment are typ10dBm per channel
(Input level + Gain = Output level).
