User Manual

Axell Wireless Limited
Technical Literature
FM Rebroadcast Amplifier 55-203201
Document Number 55-203201HBK Issue No. 1 Date 22/12/2008 Page 15 of 23
5.2. Tools & Test Equipment
The minimum tools and test equipment needed to successfully service this Axell Wireless
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.
Optical Power Meter 1300 – 1560nM (-40 - +10dB)
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.
5.3. Care of Modules
5.3.1. 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To prevent damage to a module, it must be withdrawn and inserted with care. The module may
have connectors on its underside, which might not be visible to the service operative.
5.3.2. LNA Replacement (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).
5.3.3. Module Replacement (general procedure)
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.