Handbook
Table Of Contents
- AMENDMENT LIST RECORD SHEET
- INTRODUCTION
- 1.SAFETY CONSIDERATIONS
- 2.OVERVIEW/SYSTEM DESCRIPTION
- 3.SPECIFICATIONS
- 4.SYSTEM DRAWINGS
- 5.SUB-UNIT MODULES
- 5.1Bandpass Filter (02-011601)
- 5.22-Way Splitter/Combiner (05-002602)
- 5.34-Way Splitter/Combiner (05-003302)
- 5.4¼Watt 0- -30dB Switched Attenuator \(10-0007
- 5.5Low Noise Amplifiers (11-005902 & 11-006702)
- 5.5.1Description
- 5.5.2Technical Specification (11-005902)
- 5.5.3Drg. No. 11-005902 LNA General Assembly Drawing
- 5.5.4Drg. No. 11-005970, LNA Circuit Diagram (RF)
- 5.5.5Drg. No. 11-005971, LNA Circuit Diagram (DC Wiring Layout)
- 5.5.6Technical Specification (11-006702)
- 5.5.7Drg. No. 11-006702, LNA General Assembly Drawing
- 5.5.8Drg. No. 11-006770, LNA Circuit Diagram (RF Components)
- 5.5.9Drg. No. 11-006771, LNA DC Wiring Diagram
- 5.610Watt Power Amplifier (12-002105)
- 5.73 Stage Alarm Board (12-002201)
- 5.8DC/DC Converter, 24V in, 12V 8A out (13-003011)
- 5.9Channel Control & Channel Selective Modules (17-002101 & 17-009127)
- 5.1024V Single Relay Board (80-008902)
- 5.1124V 400W Flat-Pack Power Supply (96-300011)
- 6.INSTALLATION
- 7.MAINTENANCE
- APPENDIX AINITIAL EQUIPMENT SET-UP CALCULATIONS
800MHz BDA (Pasadena Figuero Tunnel)
Maintenance Handbook
H/book Number:-60-056100HBKM
Issue No:-1
Date:-21/10/2003
Page:-
39 of 52
5.8 DC/DC Converter, 24V in, 12V 8A out (13-003011)
5.8.1 Description
The DC/DC converter fitted is an AFL assembled, high power PCB unit with an 8 amp @
12V output capability. The circuit is basically an O.E.M semiconductor regulator (one side
of which has a heatsink mounting plate, that is usually bolted to the casing/back panel of a
Cell Enhancer) and smoothing components built onto a printed circuit board with screw
block terminations.
Note: no circuit diagram of the O.E.M. regulator is available. This unit should not be
repaired, only replaced.
5.8.2 Technical Specification
PARAMETER SPECIFICATION
Input Voltage Range: 18-28V DC
Output Voltage: 12V±0.5V
Max. Current Load: 8.0Amps
operation: -10°C to +55°CTemperature
Range:
storage: -30°C to +70°C
Size(PCB): 190 x 63mm
Weight (Loaded PCB): 291gm
5.8.3 Photo of Regulator PCB (regulator heatsink side)