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 13 of 28
4.2. 3dB Splitter/Combiner (05-002603)
The 3dB Splitter/Combiner (05-002603) is a device for accurately matching two RF signals to a single
port or splitting an RF signal to two ports whilst maintaining an accurate 50 load to all inputs/outputs
and ensuring that the VSWR and insertion losses are kept to a minimum.
05-002603 Specification
PARAMETER SPECIFICATION
Frequency range: 380 - 520 MHz
Bandwidth: 140 MHz
As Combiner 2 inputs 1 output
Ports
As Splitter 1 input 2 outputs
Insertion loss: 3.5 dB (typical)
Isolation: >18 dB
Return Loss (VSWR) – Input: Better than 1.3:1
Return Loss (VSWR) – Output: Better than 1.3:1
Impedance: 50 Ω
Power Rating – Combiner: 0.5 Watt
Power Rating – Splitter: 20 Watts
Connectors: SMA female
Size: 54 x 44 x 21 mm
Weight: 200 gm (approximately)
4.3. Remote Attenuator Switch Assembly (‘10-001725’)
The remote attenuator switch assembly is used to control the amount of signal attenuation in the sub-
module, Bi-Directional Amplifier (17-017301). The switch assembly is mounted on the inside of the
Bandselective BDA (55-199102) case and consists of four miniature toggle switches, one row for
uplink and one row for downlink, built around the remote attenuator switch PCB (10-001725)
The switch assembly allows attenuation settings from 0 – 30dB in 2 dB steps The attenuation is
simply set using the four miniature toggle switches. Each switch is clearly marked with the attenuation
it provides, and the total attenuation in line is the sum of the values switched in. The attenuators that
the switches control are integral to sub-module Bi-Directional Amplifier (17-017301).