Maxon Telecom SP200, SP210 5.7 Receiver

Maxon SP200/210 Radio SP200/210

DETAILED FUNCTIONAL DESCRIPTION Issue 1.0

Page 5-8 03/01

5.7 Receiver

The receiver comprises:

Rx

VCO

~

Local

Oscillator

~

Audio

Filter FM Limiter-

Discriminator

Audio

Amplifier

Squelch

Circuit

Figure 5-4 - Receiver Block Diagram

Antenna Switch

In receive, the diodes D5 and D6 are reverse biased. L13 is n ow in circuit, passing the signal from the

antenna to the front end without signal loss.

Front End

The receive signal is routed to the RF Front End module, pin 1. It passes through a matching circuit

consisting of C601 to C603 / L601 & L602.

Diode D601 serves as protection from RF overload from nearby transmitters.

The input signal is coupled to the base of Q601 which ser ves as an RF amplifier. The output of Q601

is then coupled to a bandpass filter consisting of C604 to C620 / L603 to L607.

The output of the front end module, pin 6, is then coupled to the double-balanced mixer D9.

The receiver front end module is factory pre-tuned and r equires no adjustment. Repair is effected by

replacement of the entire module.

The modules are:

VHF 146 MHz to 174 MHz

UHF 440 MHz to 470 MHz.

Contents

Main Page Page Page TABLE OF CONTENTS 1 INTRODUCTION 1-1 2 SPECIFICATIONS 2-1 3 ACCESSORIES & OPTIONS 3-1 4 INSTALLATION, COMMISSIONING & ALIGNMENT 4-1 8 EXPLODED MECHANICAL DRAWINGS & PARTS LISTS 8-1 9 CIRCUIT DIAGRAMS & PCB LAYOUTS 9-1 10 SPARE PARTS 10-1 11 APPENDIX ACC-2003 ALIGNMENT BOX 11-1 LIST OF FIGURES LIST OF TABLES Page 1 INTRODUCTION 1.1 Using this Manual 1.2 Amendments to this Manual 1.3 Contact Information 2 SPECIFICATIONS 2.1 General Page 3 ACCESSORIES & OPTIONS 3.1 Pre-Install Check 3.2 Accessories 3.3 Options Page 4 INSTALLATION, COMMISSIONING & ALIGNMENT 4.1 Installation 11 12 4.2 Connections 4.3 Commissioning Page Page Page 4.3.1 Test Equipment Connection 4.3.2 Transmitter Performance Tests 4.3.3 Receiver Performance Tests 4.4 Power Adjustment PowerSquelch 4.5 Alignment 4.5.1 Preparation 4.5.2 Disassembly and Re-assembly of the Radio RF PCB 4.5.3 PLL Alignment 4.5.4 Squelch Sensitivity 4.5.5 Transmitter Alignment RADIOCOMMUNICATIONS TEST SET Page 4.5.6 Receiver Alignment 5 DETAILED FUNCTIONAL DESCRIPTION 5.1 Introduction 5.2 Common Circuits 5.3 Audio ASIC 5.3.1 Audio Signal Path 5.3.2 Sat Signal Path 5.3.3 Miscellaneous Signals and Controller 5.4 Audio/SAT Circuits 5.5 Common RF Circuits ~ Page 5.6 Transmitter 5.7 Receiver ~ Page Page 6 TROUBLESHOOTING 6.1 Diagnostic Function 6.2 Troubleshooting Chart 6.3 Voltage Charts 6.3.1 Transistors (Main Circuit) Maxon SP200/210 Radio SP200/210 TROUBLESHOOTING Issue 1.0 Page 6-4 03/01 6.3.2 Integrated Circuits Table 6-5 - Integrated Circuit Voltages (Transmit) Receive Table 6-4 - Integrated Circuit Voltages (Receive) Transmit Page Page Page Page 7 PROGRAMMING 7.1 SMP6100 7.1.1 Introduction 7.1.2 Getting Started 7.1.3 Programming Page Page Page 8 EXPLODED MECHANICAL DRAWINGS & PARTS LISTS 8.1 Parts List 8.2 Spare Parts Page Page Page Page Page Page 8.4 SL100 VHF Parts List 8.4.1 V2 Control Circuit Page 8.4.2 V2 RF Page Page 8.4.3 TCXO Assembly 8.4.4 V2 VCO 8.4.5 V2 Front End 8.5 SL100 UHF Parts List 8.5.1 U2 Contr o l Circuit Page 8.5.2 U2 RF Page Page 8.5.3 TCXO 8.5.4 VCO Page 9 CIRCUIT DIAGRAMS & PCB LAYOUTS Page Page Page Page Page Page Page 10 SPARE PARTS 10.1 Spare Parts 10.1.1 Component Replacement Page Page 11 APPENDIX ACC-2003 ALIGNMENT BOX 11.1 Purpose 11.2 Test Equipment 11.3 Calibration Program 11.3.1 Operation Page Page 11.3.2 Adjustment of ASIC values Page 11.3.3 Transmit Adjustments 11.3.4 Receive Adjustments 11.4 Default Settings 11.4.1 V1 Band Default Settings 11.4.2 V2 Band Default Settings 11.4.3 U1 Band Default Settings 11.4.4 U2 Band Default Settings