Motorola XTS 2500 Service Manual page 7

Table of Contents
3.5.1 Introduction................................................................................................................................ 3.5-1
3.5.2 Radio Power Up or Down.......................................................................................................... 3.5-1
3.5.3 General...................................................................................................................................... 3.5-1
3.5.4 B+ Routing for 900 MHz Band Main Board ............................................................................... 3.5-2
3.5.5 B+ and +5V Routing for VOCON............................................................................................... 3.5-3
Chapter 4.1 VHF Detailed Theories of Operation............................... 4.1-1
4.1.1 Introduction................................................................................................................................ 4.1-1
4.1.2 Frequency Synthesis................................................................................................................. 4.1-1
4.1.3 Antenna Switch ......................................................................................................................... 4.1-2
4.1.4 Receiver .................................................................................................................................... 4.1-2
4.1.4.1 Front End ....................................................................................................................... 4.1-3
4.1.4.2 Back End ....................................................................................................................... 4.1-3
4.1.5 Transmitter ................................................................................................................................ 4.1-4
4.1.6 VOCON Functional Blocks ........................................................................................................ 4.1-5
4.1.6.1 Controller and Memory Section ..................................................................................... 4.1-5
4.1.6.1.1 Patriot IC (U800)................................................................................................... 4.1-5
4.1.6.1.2 SRAM (U804) ....................................................................................................... 4.1-8
4.1.6.1.3 Flash Memory (U803) ........................................................................................... 4.1-8
4.1.6.2 Audio and Power Section ............................................................................................ 4.1-10
4.1.6.2.1 MAKO IC (U701)................................................................................................. 4.1-10
4.1.6.2.2 Regulator ............................................................................................................ 4.1-11
4.1.6.2.3 Audio Pre-Amplifier............................................................................................. 4.1-11
4.1.6.2.4 Audio Power Amplifier ........................................................................................ 4.1-11
4.1.6.3 Interface Support Section ............................................................................................ 4.1-12
4.1.6.3.1 MAKO IC U701 ................................................................................................... 4.1-12
4.1.6.3.2 ESD Protection Circuitry ..................................................................................... 4.1-13
4.1.6.3.3 Universal Connector (Side Connector) Interface Circuitry.................................. 4.1-13
4.1.6.3.4 The Option Board ............................................................................................... 4.1-15
4.1.6.3.5 Encryption Module .............................................................................................. 4.1-16
4.1.6.3.6 System Clocks .................................................................................................... 4.1-17
4.1.6.4 Transmit Audio Path .................................................................................................... 4.1-17
4.1.6.5 Receive Audio Path ..................................................................................................... 4.1-18
Chapter 4.2 UHF1 Detailed Theories of Operation ............................ 4.2-1
4.2.1 Introduction................................................................................................................................ 4.2-1
4.2.2 Frequency Synthesis................................................................................................................. 4.2-1
4.2.3 Antenna Switch ......................................................................................................................... 4.2-2
4.2.4 Receiver .................................................................................................................................... 4.2-3
4.2.4.1 Front End ....................................................................................................................... 4.2-3
4.2.4.2 Back End ....................................................................................................................... 4.2-4
4.2.5 Transmitter ................................................................................................................................ 4.2-4
4.2.6 VOCON Functional Blocks ........................................................................................................ 4.2-5
4.2.6.1 Controller and Memory Section ..................................................................................... 4.2-5
4.2.6.1.1 Patriot IC (U800)................................................................................................... 4.2-5
4.2.6.1.2 SRAM (U804) ....................................................................................................... 4.2-8
4.2.6.1.3 Flash Memory (U803) ........................................................................................... 4.2-9
4.2.6.2 Audio and Power Section ............................................................................................ 4.2-10
4.2.6.2.1 MAKO IC (U701)................................................................................................. 4.2-10
4.2.6.2.2 Regulator ............................................................................................................ 4.2-11
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February 14, 2012