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 15 Channel Repeater 50-157401 Major Sub-Components
- 4.1. Downlink Splitter/Combiner 50-157402
- 4.2. Channel Module Shelf 50-157403 (6 channels)
- 4.3. Channel Module Shelf 50-157404 (3 channels)
- 4.4. 100W Power Amplifier 80-245103
- 4.5. Uplink Triplexer Shelves 50-157405
- 4.7. Uplink 5W Amplifier Shelf 50-157406
- 4.7.2. Uplink 5W Amplifier Shelf 50-157406 Specification
- PARAMETER
- SPECIFICATION
- 5. INSTALLATION
- 6. Fault Finding & MAINTENANCE
- 6.1 General Fault Finding Procedures
- 6.2 Downlink
- 6.3 Uplink
- 6.4 Fault repair
- 6.5 Checking service
- 6.6 Service Support
- 6.7 Tools & Test Equipment
- 6.8 General Maintenance Procedures
- 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
Axell Wireless Limited
Technical Literature
15 Channel UHF Hybrid Select Repeater
Document Number 50-157401HBK Issue No. 1 Date 26/03/2008 Page 30 of 50
4.4. 100W Power Amplifier 80-245103
The 100W Power Amplifier shelf (80-245103) is a Class A 100W TETRA Linearised Class A amplifier
where 4, 25W linearised power amplifier modules (Pair “A” and Pair “B”) are combined together in a
parallel/phased configuration. Its housing is a 4U, 19” Rack mount tray with SMA connectors for the
RF input/output, 2 D-Type connectors for the alarm function and 2 DC connectors with fuse for the 24
DC supply. Its cooling is realized by fans mounted on the front panel.
It has a built in Current Fault Alarm Function with the four amplifiers in two summary alarm paths. The
summary alarm on D connector ‘A’ will show an alarm for the two amplifiers mounted on the top of the
shelf (Pair “A”) The summary alarm on D connector ‘B’ will show an alarm for the two amplifiers
mounted at the bottom of the shelf (Pair “B”).
The downlink signal is received from Downlink Splitter/Combiner 50-157402 via the SMA port on the
front panel labelled “RF INPUT” and the signal is split into two paths by a 3dB splitter/Combiner 05-
002603, one path is routed to Amplifier Pair A and the other is routed to Amplifier Pair B. Each signal
path is then further split by another pair of 3dB splitter/Combiners 05-002603 providing one path for
each of the four Amplifier Modules.
The four separate paths are then each passed through their respective Amplifier Modules 12-026901,
this configuration provides double redundancy, so should any of the 25W driver amps fail, coverage
would still continue, albeit with a slight loss in power.
After leaving the Amplifier Modules each pair of paths is then combined by a pair of 3dB
splitter/Combiners 05-002603 the resultant two paths are then combined by a further 3dB
splitter/Combiner 05-002603 and the combined signal then leaves the Amplifier Shelf to return to the
Downlink Splitter/Combiner 50-157402 via the SMA port on the front panel labelled “RF OUTPUT”