User Manual
Table Of Contents
- AMENDMENT LIST RECORD SHEET
- INTRODUCTION
- 1.SAFETY CONSIDERATIONS
- 2.OVERVIEW/SYSTEM DESCRIPTION
- 3.SPECIFICATION
- 4.SYSTEM DRAWINGS
- 5.SUB-UNIT MODULES
- 5.1VTA Downlink Duplexer Shelf 60-025302 (4U chassis)
- 5.2VTA Downlink Amplifier Shelf (50-025303, 8U Chassis)
- 5.2.1UHF 3dB Splitter (05-002603)
- 5.2.2¼Watt 0- -30dB Switched Attenuator \(10-00
- 5.2.3Low Noise Amplifier (11-006102)
- 5.2.4Low Noise Amplifiers (11-007302 & 11-007402)
- 5.2.4.1Description
- 5.2.4.2Technical Specification, (11-007302)
- 5.2.4.3Technical Specification (11-007402)
- 5.2.4.4Drg. No. 11-007302, LNA Assembly With Alarm Relay
- 5.2.4.5Drg. No. 11-007370, LNA RF Circuit Diagram
- 5.2.4.6Drg. No. 11-007371, LNA DC Wiring Diagram
- 5.2.5.7Drg. No. 11-003971, LNA DC Circuit Diagram
- 5.2.63 Stage Amplifier Alarm Boards (12-002201)
- 5.2.7450MHz 20W Power Amplifier (12-004201)
- 5.2.8Single DC/DC Converter (13-001702)
- 5.2.924V Single Relay Board (80-008902)
- 5.2.1024V 410W Power Supply (96-300054)
- 5.3VTA Downlink Channel Shelf (50-025304)
- 5.4VTA Uplink Duplexer Shelf (50-025305, 4U Chassis)
- 5.5VTA Uplink Amplifier Shelf (50-025306, 8U Chassis)
- 5.5.120Watt Class A Power Amplifier (12-016301)
- 5.5.2Automatic Gain Control (17-001101, Det. & 17-001201, Atten.)
- 5.5.2.1Description
- 5.5.2.2Technical Specification
- 5.5.2.3Drg. No. 17-001101, ACG Detector Assembly
- 5.5.2.4Drg. No. 17-001171, AGC Detector Circuit Diagram
- 5.5.2.5Drg. No. 17-001171C, AGC Detector Parts List
- 5.5.2.6Drg. No. 17-001201, AGC Attenuator Assembly Drawing
- 5.5.2.7Drg. No. 17-001270, AGC Attenuator Circuit Diagram
- 5.5.2.8Drg. No. 17-001270C, AGC Attenuator Parts List
- 6.INSTALLATION
- 7.MAINTENANCE
- APPENDIX AINITIAL EQUIPMENT SET-UP CALCULATIONS
9 Way Channelised UHF Cell Enhancer
Maintenance Handbook
H/book Number:-50-025301HBKM
Issue No:-
1
Date:-04/07/2003
Page:-
53 of 69
5.4 VTA Uplink Duplexer Shelf (50-025305, 4U Chassis)
5.4.1 Bandpass Filters (02-011204 & 02-013401) See section 5.1.1
5.5 VTA Uplink Amplifier Shelf (50-025306, 8U Chassis)
5.5.1 20Watt Class A Power Amplifier (12-016301)
5.5.1.1 Description
This amplifier is a Class A 20W power amplifier with a frequency range from 380MHz to
470MHz in a 1 stage balanced configuration. It demonstrates a very high linearity and a very
good input/output return loss (RL). It has built in a Current Fault Alarm Function.
Its housing is an aluminium case (Alocrom 1200 finish) with SMA connectors for the RF
input/output and a D-Type connector for the power supply and the Current Fault Alarm
Function.
5.5.1.2 Technical Specification
Parameters Guaranteed Guaranteed Units
Temperature
+25
-10 to +60
°C
Frequency Range 380 - 470 MHz
Small Signal Gain
≥23.0
dB
Gain Flatness 1.5 1.7 dB p-p Max
∆Gain vs. Temperature
1.0 dB Max
In/Out RL 18 18 dB Min
Output Power @ 1dB
Compression Point
43.2 43.0 dBm Min
Output 3
rd
Order IP 55.3 55.0 dBm Min
DC Supply Voltage
24 ± 0.5
Vdc
DC Supply Current 3700 typical 3800 mA Max