Motorola EP450 5.5 Receiver Tuning

December 3, 2003 HKLN4215A

5-10 Radio Alignment Procedures: Receiver Tuning

5.4.6 MDC-1200 Deviation Tuning

This tuning option controls the MDC-1200 Signaling deviation. Please note that Modulation Balancing

and VCO Attenuation have to be performed prior to this tuning operation. Not doing so will result in

the wrong deviation value being obtained while tuning this feature.

1. Under the Tx Align, select MDC-1200 Signaling (Figure 5-8).

2. Press PTT Toggle to key the radio up. Monitor the deviation obtained.

3. Adjust the slider, spin or edit control (press ENTER to confirm the selection/send a softpot value)

until a deviation of 3.3-3.7 kHz is obtained.

4. Press PTT Toggle again to dekey the radio.

5. Program the softpot value into the radio by pressing the Program.

6. Exit the MDC-1200 Deviation function.

5.5 Receiver Tuning

The following sub-sections contain the procedures to tune the radio receiver. These procedures

include:

• Rated Volume

• Squelch Tuning Front End Filter T uning

Figure 5-8. MDC-1200 Deviation Tuning Window

Contents

Main Page Foreword Product Safety and RF Exposure Compliance Computer Software Copyrights Document Copyrights ! Table of Contents Chapter 6 Display Model Disassembly and Re-assembly ................ 6-1 Chapter 7 Non-Display Model Disassembly and Re-assembly ........ 7-1 Chapter 8 Troubleshooting Tables ..................................................... 8-1 List of Figures Page List of Tables Related Publications Chapter 1 Model Charts and Test Specifications 1.1 Radio Model Information 1.2 Model Chart for VHF 146-174 MHz EP450, VHF, 146-174 MHz 1.3 VHF Test Specifications General Transmitter Receiver 1.4 Model Chart for UHF 403-440 MHz EP450, UHF, 403-440 MHz 1.5 Model Chart for UHF 438-470 MHz EP450, UHF, 438-470 MHz 1.6 Model Chart for UHF 465-495 MHz EP450, UHF, 465-495 MHz 1.7 UHF Test Specifications General Transmitter Receiver December 3, 2003 HKLN4215A 1-8 Model Charts and Test Specifications: MIL Standards 1.8 MIL Standards Chapter 2 Theory Of Operation 2.1 Introduction 2.2 Major Assemblies 2.2.1 Receiver 2.2.2 Transmitter Frac N Mod IF IC Chapter 3 Test Equipment, Service Aids, and Service Tools 3.1 Test Equipment 3.2 Service Aids Page December 3, 2003 HKLN4215A 3-4 Test Equipment, Service Aids, and Service Tools: Service Aids Programming/Test Cable Figure 3-1. Programming/Test Cable Figure 3-2. Wiring of the Connectors Chapter 4 Performance Checks 4.1 General 4.2 Power-Up Self Test 4.3 RF Test Mode Page Page 4.0 kHz but 5.0 kHz Page Chapter 5 Radio Alignment Procedures 5.1 Introduction 5.2 CPS Programming Setup 5.3 Radio Tuning Setup 5.3.1 Initial Test Equipment Control Settings 5.4 Transmitter Alignment Options 5.4.1 Reference Oscillator Warp 5.4.2 Modulation Balance Attenuation 5.4.3 Transmit Power Tuning 5.4.3.1 To Perform Transmit High Power Tuning, do the following: 5.4.3.2 To Perform Transmit Low Power Tuning, do the following: - 5.4.4 VCO Attenuation 5.4.4.1 VCO Attenuation 25 kHz 5.4.4.2 VCO Attenuation 12.5 kHz 5.4.4.3 VCO Attenuation 20 kHz 5.4.5 DTMF Deviation Tuning 5.4.6 MDC-1200 Deviation Tuning 5.5 Receiver Tuning 5.5.1 Rated Volume Tuning 5.5.2 Squelch Tuning 5.5.2.1 Manual Squelch Tuning 5.5.2.2 Auto Tune 5.5.3 RSSI System Level Tuning 5.5.4 RSSI Display Tuning 5.6 Utilities 5.6.1 Program Serial No. 5.7 Radio-to-Radio Cloning Page Page Chapter 6 Display Model Disassembly and Re-assembly 6.1 Introduction 6.2 Preventive Maintenance 6.2.1 Inspection 6.2.2 Cleaning Procedures 6.3 Safe Handling of CMOS and LDMOS Devices 6.4 Disassembling and Re-assembling the Radio General 6.4.1 Radio Disassembly Detailed 6.4.1.1 Front Cover From Chassis Disassembly Page Page 6.4.1.2 Dust Cover Disassembly 6.4.1.3 Speaker and Microphone Disassembly 6.4.1.4 Keyboard Removal 6.4.1.5 PTT Disassembly 6.4.1.6 Chassis Disassembly 6.4.2 Radio Re-assembly - Detailed 6.4.2.1 Dust Cover Re-assembly 6.4.2.2 Microphone and Speaker Re-assembly Page 6.4.2.3 Keypad and LCD/Keyboard Re-assembly 6.4.2.4 Keyboard Retainer Re-assembly 6.4.2.5 Chassis Assembly/Re-assembly 6.4.2.6 Chassis and Front Cover Re-assembly Page 6.4.2.7 PTT Re-assembly 6.5 Mechanical View and Parts List 6.5.1 EP450 Display Exploded View and Parts List Figure 6-22. EP450 Display Radio Exploded View 1 Page Chapter 7 Non-Display Model Disassembly and Re-assembly 7.1 Introduction 7.2 Preventive Maintenance 7.2.1 Inspection 7.2.2 Cleaning Procedures 7.3 Safe Handling of CMOS and LDMOS Devices 7.4 Disassembling and Re-assembling the Radio General 7.4.1 Radio Disassembly Detailed 7.4.1.1 Front Cover From Chassis Disassembly Page 7.4.1.2 Dust Cover Disassembly 7.4.1.3 Speaker and Microphone Disassembly 7.4.1.4 PTT Disassembly 7.4.2 Chassis Disassembly 7.4.3 Radio Re-assembly - Detailed 7.4.3.1 Dust Cover Re-assembly 7.4.3.2 Microphone and Speaker Re-assembly 7.4.3.3 Chassis Assembly/Re-assembly 7.4.3.4 Chassis and Front Cover Re-assembly c. 7.4.3.5 PTT Re-assembly Page 7.5 Mechanical View and Parts List 7.5.1 EP450 Non-Display Exploded View and Parts List Figure 7-16. EP450 Non-Display Radio Exploded View Page Chapter 8 Troubleshooting Tables 8.1 Power-Up Error Codes 8.2 Operational Error Codes 8.3 Troubleshooting Table for Receiver 8.4 Troubleshooting Table for Transmitter Page Appendix A Accessories Antennas Carrying Accessories Chargers Batteries Audio Accessories Headsets Remote Speaker Microphones Manuals Page Appendix B Warranty, Service Support, and Replacement Parts 1.1 Scope of Manual 1.2 Warranty 1.2.1 Warranty Period and Return Instructions 1.2.2 After Warranty Period 1.3.2 Motorola Online 1.3.3 Mail Orders 1.3.4 Telephone Orders 1.3.5 Fax Orders 1.3.6 Parts Identification 1.4 Technical Support Page Glossary of Terms