User's Manual
Table Of Contents
- Front Cover
- Contents
- 1 - Foreword 11
- 2 - Safety and General Information 21
- 3 - Introduction 31
- 4 - System Applications 41
- 5 - Models and Specifications 51
- 6 - Approved Accessories 61
- 7 - Setup and Connections 71
- 8 - Operation 81
- 9 - Troubleshooting 91
- Introduction 91
- Recommended Test Equipment 91
- Troubleshooting Procedures 91
- Module Replacement Procedures 925
- General Replacement Information 925
- Anti-Static Precaution 925
- Care of Gold-Plated Connector Contacts 926
- Power Down Station Before Removing/Inserting Modules 926
- Validating Repairs 926
- Module Replacement 926
- Wireline 928
- ASTRO Modem Card/V.24 Interface Card 929
- Receiver 929
- Exciter 931
- Power Amplifier 932
- Power Supply 933
- Backplane 934
- Preselector Field Tuning Procedure 935
- 10 - Functional Theory of Operation 101
- 11 - Block Diagram, Schematics, Electrical Parts List, and Circuit Board Detail 111
- List of Tables
- List of Figures
- Parts Lists
- Foreword
- Safety and General Information
- Introduction
- System Applications
- Models and Specifications
- Approved Accessories
- Setup and Connections
- Operation
- Troubleshooting
- Introduction
- Recommended Test Equipment
- Troubleshooting Procedures
- Module Replacement Procedures
- Preselector Field Tuning Procedure
- Functional Theory of Operation
- Schematics
- Back Cover
9-18 December 1, 2000 68P81093C75-O
Step 5. Use the Volume Up button to increase the volume to
maximum. Measure the audio level using the R2001.
• Audio level should measure approximately 0.75 to
1.5 V p-p. If not, suspect faulty SCM.
Step 6. Change R2001 injection signal to
• VHF: 0.25 µV (-119 dBm)
• UHF: 0.35 µV (-116 dBm).
Step 7. Measure the receiver 12 dB SINAD sensitivity. The
value should read 12 dB, or greater. If not, tune the
preselector (VHF and UHF only) and re-check 12 dB
SINAD. If 12 dB SINAD cannot be achieved, suspect
the following:
• Damaged cable from top panel receive port to
preselector
• Faulty receiver
• Excessive loss in the R2001-to-station RF cable
NOTE: To measure 12 dB SINAD, the station must be
programmed for mixed mode Analog/Digital
operation. Incorrect reading will result if
programmed for Digital Only operation.
NOTE: For VHF and UHF stations only, refer to
5. Preselector Field Tuning Procedure in this
section. Procedures for tuning the receiver
preselector are described.
Step 8. If the station is configured with a duplexer, continue
with Step 9 to test the duplexer’s performance. If the
station is not configured with a duplexer, go to Step
16.
Step 9. Steps 9 through 13 describe a method of measuring
the effect of insertion loss from the duplexer on
receiver sensitivity. Connect the dummy load to the
station’s top panel receive port through a capacitive
coupler (isolated T). Connect the R2001 to the isolated
side of the coupler. (See Figure 8.)