Technical Manual

GUARDIAN VHF 110W MOBILE iii
CONTENTS
CHAPTER 1:
GENERAL INFORMATION ................................................................................................. 1-1
1.1 SCOPE ......................................................................................................................................................... 1-1
1.2 GENERAL DESCRIPTION .............................................................................................................................. 1-1
1.3 PERFORMANCE SPECIFICATIONS ................................................................................................................. 1-1
CHAPTER 2: HARDWARE THEORY OF OPERATION.......................................................................... 2-1
2.1 INTRODUCTION ........................................................................................................................................... 2-1
2.2 SYSTEM SPECIFICATIONS ............................................................................................................................ 2-1
2.3 SYSTEM BLOCK DIAGRAM.......................................................................................................................... 2-2
2.4 RECM CONTROL HARDWARE THEORY OF OPERATION.............................................................................. 2-4
2.4.1 Control Logic ..................................................................................................................................... 2-4
2.4.2 DSP .................................................................................................................................................... 2-7
2.4.3 Flash ROM......................................................................................................................................... 2-7
2.4.4 RAM .................................................................................................................................................. 2-7
2.4.5 TCXO................................................................................................................................................. 2-7
2.4.6 FPGA ................................................................................................................................................. 2-8
2.4.7 IF ADC............................................................................................................................................... 2-8
2.4.8 Clock Generation ............................................................................................................................... 2-8
2.4.9 Logic Audio CODEC......................................................................................................................... 2-8
2.4.10 Accessory Connector Interface and Filtering.....................................................................................2-8
2.4.11 Transceiver Interface and Filtering .................................................................................................... 2-8
2.4.12 Keypad Interface ................................................................................................................................ 2-8
2.4.13 Audio Interface................................................................................................................................... 2-8
2.4.14 Test Interface...................................................................................................................................... 2-9
2.4.15 LED.................................................................................................................................................... 2-9
2.4.16 RECM Power Consumption............................................................................................................... 2-9
2.5 RECM TRANSCEIVER SECTION .................................................................................................................. 2-9
2.5.1 Interface Section................................................................................................................................. 2-9
2.5.2 Receiver Section............................................................................................................................... 2-10
2.5.3 Digital/Analog Control..................................................................................................................... 2-13
2.5.4 Keypad Microcontroller ................................................................................................................... 2-14
2.6 AUDIO AMPLIFIER BOARD ........................................................................................................................ 2-14
2.6.1 Description....................................................................................................................................... 2-14
2.6.2 Power Conditioning ......................................................................................................................... 2-14
2.6.3 Communication with Transceiver .................................................................................................... 2-15
2.6.4 Audio Amplifiers ............................................................................................................................. 2-15
2.6.5 Power Levels Detector, Converter, and RF/DC Combiner .............................................................. 2-15
2.6.6 PA ON/OFF Control (Bypass Mode)............................................................................................... 2-16
2.6.7 RF Power Indication ........................................................................................................................ 2-16
2.6.8 Audio Board Block Diagram............................................................................................................ 2-16
2.7 DISPLAY BOARD ....................................................................................................................................... 2-17
Figure 2-4: Guardian Keypad Board............................................................................................................... 2-17
2.7.1 Control Logic Interface .................................................................................................................... 2-18
2.7.2 Keypad ............................................................................................................................................. 2-18
2.7.3 Switch Interface ............................................................................................................................... 2-18
2.8 FRONT PANEL INTERFACE BOARD ............................................................................................................ 2-18
CHAPTER 3: SOFTWARE THEORY OF OPERATION ........................................................................... 3-1
3.1 FUNCTIONAL SYSTEM OPERATION.............................................................................................................. 3-1
3.1.1 General............................................................................................................................................... 3-1
3.1.2 Guardian Block Diagram ................................................................................................................... 3-1
3.1.3 Architecture........................................................................................................................................ 3-2
3.1.4 Board Identification ........................................................................................................................... 3-2