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
68P81093C75-O November 30, 2000 9-39
Step 3. Insert the tuning probe into the cavity “H1” and adjust
tuning screw 1 for a PEAK.
Step 4. Leave the tuning probe in cavity “H1” and adjust
tuning screw 2 for a DIP.
Step 5. Insert the tuning probe into cavity “H2” and adjust
tuning screw 3 for a DIP.
Step 6. Insert the tuning probe into cavity “H3” and adjust
tuning screw 4 for a DIP.
Step 7. Insert the tuning probe into cavity “H4” and decrease
the output from the signal generator to -5 dBm.
Step 8. Adjust tuning screw 5 for a DIP. Then turn tuning
screw 5 one-quarter turn counterclockwise.
NOTE: The DIP will not be as sharp for screw 5 as it was for
screws 2 through 4.
UHF Tuning Procedure
Calculating Proper
Alignment Frequency
Use one of the following two methods to calculate the alignment
frequency to be generated by the signal generator.
For stations with a single receive frequency, calculate the frequency
of the alignment signal as follows:
Step 1. From the site documentation, or the RSS, determine
the station receive frequency. Add 200 kHz.
Step 2. If the Receiver Module is Range 1, determine the
alignment frequency as follows:
Figure 13 Location of Tuning Screws and Cavity Probe Holes
To
Receiver
Board
To
Station Receive
Antenna Port
Preselector
Assembly
MAEPF-27039-O
H1
H2
H3
H4
H5
TUNING SCREW 1
TUNING SCREW 2
TUNING SCREW 3
TUNING SCREW 4
TUNING SCREW 5