User Manual
Table Of Contents
- 1. INTRODUCTION
- 1.1. Scope and Purpose of Document
- 1.2. Limitation of Liability Notice
- 2. SAFETY CONSIDERATIONS
- 3. EQUIPMENT OVERVIEW
- 4. UHF BANDSELECTIVE, BDA (55-199102) SUB MODULES
- 4.1. Bandpass Filter (02-010701)
- 4.2. 3dB Splitter/Combiner (05-002603)
- 4.3. Remote Attenuator Switch Assembly (‘10-001725’)
- 4.4. 5 Watt Tetra Amplifier (12-021601)
- 4.5. Linearised Power Amplifier (12-026901)
- _
- 4.6. Voltage Regulator Board 9.0V (13-001714)
- 4.7. DC/DC Converter, 24V in, 12V 8A out (13-003011)
- 4.8. Bi-Directional Amplifier (17-017301)
- 4.9. 12V (Single) Relay Board (80-008901)
- 4.10. 24V Switch-Mode PSU (96-300054)
- 5. INSTALLATION & COMMISIONING
- 6. FAULT FINDING / MAINTENANCE
- 6.1. Tools & Test Equipment
- 6.2. Basic Fault Finding
- 6.3. Quick Fault Checklist
- 6.4. Downlink
- 6.5. Uplink
- 6.6. Fault repair
- 6.7. Service Support
- 6.8. Care of Modules
- 6.9. Module Removal (LNAs, general procedure):
- 6.10. Module Replacement (general):
- 6.11. Power Amplifiers
- 6.12. Low Power Amplifier Replacement
- 6.13. Module Transportation:
- APPENDIX A
- _
- _
- APPENDIX B
UHF Bandselective BDA
90dB 40/5W
Document Number 55-199102HBKM Issue No. 1 Page 22 of 28
6.8. Care of Modules
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. Good engineering practices should be observed at all times.
To prevent damage to a module, it must be withdrawn/inserted with care.
6.9. Module Removal (LNAs, general procedure):
The following general rules should be followed to remove a module:
1) Remove power to the unit
2) Remove all 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.
6.10. 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.
3) Replace retaining screws (if any).
4) Double-check all connections before applying power.
6.11. Power Amplifiers
1) Remove power to the unit. (Switch off at mains/battery)
2) Disconnect multi-way alarm ‘D’ type connector
3) Carefully disconnect the RF input and output coaxial connectors (usually SMA)
4) If the amplifier to be removed has a heatsink attached, there may be several different ways it
can have been assembled. The most commonly used method, is screws through the front of the
heatsink to threaded screw holes (or nuts and bolts), into the amplifier within the main case. If the
heatsink is mounted on the rear of the main case (e.g., against a wall in the case of wall mounted
enclosures), then the fixing method for the heatsink will be from within the case, (otherwise the
enclosure would have to be removed from the wall in order to remove the heatsink).
When the heatsink has been removed, the amplifier may be unscrewed from the main casing by its
four corner fixings and gently withdrawn.
Fitting a new power amplifier module will be the exact reverse of the above.
Note: Do not forget to apply fresh heatsink compound to the heatsink/main case joint and
also between the amplifier and the main case.