Handbook
Table Of Contents
- AMENDMENT LIST RECORD SHEET
- INTRODUCTION
- 1.SAFETY CONSIDERATIONS
- 2.OVERVIEW/SYSTEM DESCRIPTION
- 3.SPECIFICATION
- 3.150-063701 Parts Lists
- 3.1.1Base Antenna Side UHF Duplex/PA Shelf 50-063702 Parts List
- 3.1.2Downlink UHF 5 Channel Shelf 50-063703 Parts List
- 3.1.3Uplink UHF 4 Channel Shelf 50-063704 Parts List
- 3.1.4Tunnel side UHF Duplex/PA Shelf 50-063705 Parts List
- 3.1.5UHF Simplex Shelf 50-063706 Parts List
- 3.1.6Power Supply Shelf 50-063707 Parts List
- 3.2Technical Specification
- 3.3Mechanical Specification
- 3.150-063701 Parts Lists
- 4.SYSTEM DRAWINGS
- 4.1Drg. No. 50-063751, Channelised Cell Enhancer Rack Layout Drawing
- 4.2Drg. No. 50-063781, Channelised Cell Enhancer System Diagram
- 4.3Drg. No. 50-063792, Base Side Duplex Shelf Outline Drawing
- 4.3Drg. No. 50-063793, Downlink Channels Shelf Outline Drawing
- 4.4Drg. No. 50-063794, Uplink Channels Shelf Outline Drawing
- 4.5Drg. No. 50-063795, Tunnel Side Duplexer Shelf Outline Drawing
- 4.6Drg. No. 50-063796, UHF Simplex Shelf Outline Drawing
- 4.7Drg. No. 50-063797, Power Supply Shelf Outline Drawing
- 5.SUB-UNIT MODULES
- 5.1UHF Duplex Shelf 50-063702
- 5.25 Channel UHF Downlink Shelf 50-063703
- 5.3UHF Uplink 4 Channel Shelf 50-063704
- 5.4UHF Duplex/PA Shelf 50-063705
- 5.5UHF Simplex Channel Shelf 60-063706
- 5.6Power Supply Shelf 50-063707
- 6.INSTALLATION
- 7.MAINTENANCE
- APPENDIX AINITIAL EQUIPMENT SET-UP CALCULATIONS
Denver Channelised CE
User/Maintenance Handbook
Handbook Nō.-50-063708HBKM Issue No:-2
Date:-03/11/2003
Page:-
33 of 51
5.1.4 ¼Watt 0- -30dB Switched Attenuator (10-000701)
5.1.4.1 General Application
In many practical applications for Cell Enhancers etc., the gain in each path is found to be
excessive. Therefore, provision is made within the unit for the setting of attenuation in
each path, to reduce the gain.
5.1.4.2 Switched Attenuators
The AFL switched attenuators are available in two different types; 0 – 30dB in 2 dB steps
(as in this case), or 0 – 15dB in 1 dB steps. The attenuation is simply set using the four
miniature toggle switches on the top of each unit. Each switch is clearly marked with the
attenuation it provides, and the total attenuation in line is the sum of the values switched
in. They are designed to maintain an accurate 50Ω impedance over their operating
frequency at both input and output.