User's Guide

Maintenance Handbook (1)
Baltimore Radio Repeater System
Handbook No. 60-166101HBKM Page 25 of 33
4.6 Wall Mounted Equipment
The procedure for installing and commissioning a wall-mounted Bi-Directional
Amplifier unit is generally as follows:
3 Fix the unit in the chosen position. Ensure the mounting site is a straight, smooth,
perpendicular surface (brick or concrete recommended). Mounting bracket centres/dimensions
will be found in the specifications section (3.3). After fixing, mechanically test the installation
before proceeding.
4 Fix the two antennas (antenna isolation should already have been performed see section 4.2)
and connect them to the BDA.
5 Connect a suitable mains and/or battery power supply to the unit.
6 Connect the alarm interface connectors.
7 Calculate the attenuation settings required for the uplink and the downlink paths, and set the
attenuators as described elsewhere in this document.
8 Double-check all RF and power connections before switching the BDA mains on with the
small switch located inside the unit on the lower right hand side of the case.
9 Alarms may not settle for several seconds after switch-on, but they should extinguish after a
short time (up to 15 seconds).
Make test calls via the equipment to ensure correct operation, if possible monitoring the signal levels
during these calls to ensure that the uplink and downlink RF levels are as anticipated.
4.7 RF Connections
Care must be taken to ensure that the correct connections are made with particular attention made to
the optical TX/RX ports.
Ensure that connections are kept clean and are fully tightened.
4.8 RF Commissioning
Once all connections are made the equipment is ready for commissioning.
To commission the system the test equipment detailed in Section 5.1 will be required.
Using the system diagrams and the end-to-end test specification, the equipment should be tested to
ensure correct operation.
On initial power up the system alarm indicators on the front panels of the equipment should be
checked. A red LED illuminated indicates a fault in that particular shelf that must be investigated
before proceeding with the commissioning. A green LED on each shelf illuminates, to indicate that the
power supply is connected to the shelf.
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 interconnecting
cables and connectors.