User Manual

Axell Wireless Limited
Technical Literature
L.A. M.T.A. Remote Sites
Document Number 80-301401HBKM Issue No. 1 Date 13/06/2008 Page 142 of 148
6.2 Tools & Test Equipment
The minimum tools and test equipment needed to successfully service this Axell product are as
follows-
Spectrum analyser 100kHz to 2GHz (Dynamic range = 90dB).
Signal Generator 30MHz to 2GHz (-120dBm to 0dBm o/p level).
Attenuator 20dB, 10W, DC-2GHz, (N male – N female).
Test Antenna Yagi or dipole for operating frequency.
Digital multi-meter Universal Volt-Ohm-Amp meter.
Test cable x 2 N male – N male, 2M long RG214.
Test cable x 2 SMA male – N male, 1m long RG223.
Hand tools Philips #1&2 tip screwdriver.
3mm flat bladed screwdriver.
SMA spanner and torque setter.
6.3 Care of Modules
6.3.1 General Comments
Many of the active modules contain semiconductor devices utilising MOS technology, which can be
damaged by electrostatic discharge. Correct handling of such modules is mandatory to ensure their
long-term reliability.
To prevent damage to a module, it must be withdrawn/inserted with care. The module may have
connectors on its underside, which might not be visible to the service operative.
6.3.2 Module Removal (LNAs, general procedure)
The following general instructions should be followed to remove a module
1 Remove power to the unit
2 Remove all visible connectors (RF, DC & alarm)
3 Release module retaining screws.
4 Slowly but firmly, pull the module straight out of its position. Take care not to twist/turn the
module during withdrawal. (When the module is loose, care may be needed, as there may be
concealed connections underneath).
6.3.3 Module Replacement (general)
1 Carefully align the module into its location then slowly push the module directly straight into its
position, taking care not to twist/turn it during insertion.
2 Reconnect all connectors, RF, alarm, power etc., (concealed connectors may have to be
connected first).
3 Replace retaining screws (if any).
4 Double-check all connections before applying power.
6.3.4 Power Amplifiers
1) Remove power to the unit. (Switch off at mains/battery, or remove DC in connector)
2) Remove alarm wires from alarm screw terminal block or disconnect multi-way alarm
connector.