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
9-38 December 1, 2000 68P81093C75-O
If the alignment frequency (calculated in the previous
section) is greater than 148 MHz (Range 1), or
greater than 156 MHz (Range 2), turn the five tuning
screws in (clockwise) until 1/8" protrudes past each of
the tension nuts.
If the alignment frequency is less than, or equal to 148
MHz (Range 1), or 156 MHz (Range 2), back out
(counterclockwise) the five tuning screws until 3/4"
protrudes past each of the tension nuts.
Step 5. Using the torque driver and deep-well socket, tighten
the five tension nuts on the adjustment screws to
6 in. – lb.
Step 6. Connect the test equipment as shown in Figure 12.
VHF Tuning Procedure Step 1. Provide power to the PDR 3500 through either DC or
AC (to provide the active 50 Ω termination).
Step 2. Adjust the signal generator to the frequency calculated
on page 36. Set the level to +5 dBm.
Figure 12 Test Equipment Setup for Preselector Field Tuning
Tension Nut
Tuning Screw
To Dip/Peak
Monitor
(RF Millivoltmeter
or Power Meter)
From
Signal
Generator
Tuning
Probe
To
Receiver
Board
To RX
Connector
on Top Panel
Preselector
Assembly
RX
TX
MAEPF-27038-O