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 7 of 50
3. Equipment Overview
15 Channel UHF Hybrid Select Repeater 50-157401
The repeater consists of 10 rack mount chassis housed in a 43U, 19” equipment mounting rack
Downlink signals are received from the RX antenna and passed into the Downlink Splitter/Combiner
shelf 50-157402. The signal is passes through a bandpass filter to remove out of band noise and then
passes through a low noise amplifier. The signal is then split into three separate paths, each path
then leaves the Splitter/Combiner shelf and passes into the channel module shelves, (Qty. 2, 6
channel shelves (50-157403) and a 3 channel shelf (50-157404) providing 15 channels) where the
channel modules ‘pick-out’ the required channels from within the frequency band, providing
selectivity, automatic gain levelling.
After leaving the channel modules the signals are re-combined and pass back into the
Splitter/Combiner where the signal passes through a 1W power amplifier. After the signal has been
amplified it again leaves the Splitter/Combiner shelf to pass through 100W Amplifier Shelf 80-245103
then returns to the Splitter/Combiner shelf to pass through a further bandpass filter before being
passed through a hybrid splitter/combiner (which separates the downlink from the uplink) and then the
signal exits the Splitter/Combiner shelf and is passed to the two LCX cables.
Uplink signals are received into Splitter/Combiner shelf 50-157402 from the LCX cables and pass
through the hybrid splitter/combiner before exiting the Splitter/Combiner shelf and entering the first of
the two Triplexer shelves 50-157405. This first Triplexer shelf splits the Uplink signal into three paths,
each path then passes through its own dedicated 5W Amplifier shelf 50-157406, each shelf provides
amplification and further bandpass filtering. After the three signals leave the 5W amplifier shelves they
enter the second Triplexer shelf where the three paths are combined to produce a single output which
is then passed to the TX Antenna.
The main RF connections to the rack are made to a patch-panel located on the lid of the rack
Downlink Splitter/Combiner shelf 50-157402 also contains two PSUs which are fed by a 110V AC
mains input, the AC connection is made via a terminal block mounted inside in the top of the rack.
The PSUs provides 2, 24V DC outputs to power the amplifier modules in 100W Amplifier Shelf 80-
245103 and 6, 12V DC outputs to power the Channel Module racks and the 5W Uplink Amplifier
Shelves.
All the Amplifier Shelves and the Channel Module shelves are equipped with alarm outputs which are
terminated at a Krone Block mounted inside at the top of the rack. There are two cable glands
mounted in the lid of the rack; one allows the AC mains cable to enter and the other allows the alarm
cable to exit.