User Manual
Table Of Contents
- 1. INTRODUCTION
- Scope and Purpose of Document
- Limitation of Liability Notice
- 2. SAFETY CONSIDERATIONS
- 3. EQUIPMENT OVERVIEW
- 4. SUB-UNIT MODULES
- 4.1 Bandpass Filter (02-010201)
- 4.2 Two-Way Splitter (07-002503)
- 4.3 0.25Watt 0- -30dB Switched Attenuator (10-000703)
- 4.4 11-007302 & 11-007402 Low Noise Amplifiers
- 4.4.1 Description
- 4.4.2 Technical Specification (11-007302)
- 4.4.3 Technical Specification (11-007402)
- 4.4.4 LNA ‘D’ Connector Pin-out details
- 4.4.5 Drg. # 11-007302, LNA Assembly With Alarm Relay
- 4.4.6 Drg. # 11-007370, LNA RF Circuit Diagram
- 4.4.7 Drg. # 11-007371, LNA DC Wiring Diagram
- 4.4.8 Drg. # 11-003971, LNA DC Circuit Diagram
- 4.4.9 Drg. # 11-007402, LNA Assembly With Alarm Relay
- 4.4.10 Drg. # 11-007470, LNA RF Circuit Diagram
- 4.5 12-021601 5Watt Medium Power Tetra Amplifier
- 4.6 12-022101 10Watt Power Tetra Amplifier
- 4.7 8A Mains Filter Assembly (13-003301)
- 4.8 Channel Control Module (17-002101)
- 4.9 Channel Selective Module (17-003007)
- 4.10 12V Single Relay Board (80-008901)
- 4.11 12V Switch-Mode PSU (96-300052)
- 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 (LNA’s, 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
Two Channel UHF Cell Enhancer
User Handbook
Handbook Number: 50-187601HBKM Page: 14 of 51
4. SUB-UNIT MODULES
4.1 Bandpass Filter (02-010201)
4.1.1 Description
The bandpass filters are multi-section designs with a bandwidth dependent upon the passband
frequencies, (both tuned to customer requirements). The response shape is basically Chebyshev with a
passband design ripple of 0.1dB. The filters are of combline design, and are carefully aligned during
manufacture in order to optimise the insertion loss, VSWR and intermodulation characteristics of the unit.
The tuned elements are silver-plated to reduce surface ohmic losses and maintain a good VSWR figure
and 50Ω load at the input and output ports.
Being passive devices, the bandpass filters should have an extremely long operational life and require no
maintenance. Should a filter be suspect, it is usually most time efficient to replace the module rather than
attempt repair or re-tuning.
4.1.2 Technical Specification
PARAMETER SPECIFICATION
Response type: Chebyshev
451.5-453.0MHz (downlink)
Frequency range:
456.5 – 458.0MHz (uplink)
Bandwidth: 1.5 MHz
Number of sections: 6
Insertion Loss: 1.2 dB
VSWR: better than 1.2:1
Connectors: SMA
Power handling: 100W max
operation: -20°C to +60°C
Temperature range
storage: -40°C to +70°C
Weight: 3 kg (typical)