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Table of Contents

Chapter 1 MODEL CHART AND TECHNICAL SPECIFICATIONS

1.0 GM140/GM160 Model Chart................................................................................1-1

2.0 GM340/GM360/GM380 Model Chart...................................................................1-1

3.0 GM640/GM660/GM1280 Model Chart.................................................................1-2

4.0 Technical Specifications ......................................................................................1-3

Chapter 2 THEORY OF OPERATION

1.0 Introduction ..........................................................................................................2-1

2.0 VHF (136-174MHz) Receiver...............................................................................2-1

2.1 Receiver Front-End ........................................................................................2-1

2.1 Front-End Band-Pass Filters & Pre-Ampliﬁer .................................................2-2

2.2 First Mixer and High Intermediate Frequency (IF)..........................................2-2

2.3 Low Intermediate Frequency (IF) and Receiver Back End.............................2-2

3.0 VHF (136-174MHz)

Transmitter Power Ampliﬁer (PA) 25 W......................2-3

3.1 First Power Controlled Stage..........................................................................2-3

3.2 Power Controlled Driver Stage .......................................................................2-4

3.3 Final Stage .....................................................................................................2-4

3.4 Directional Coupler.........................................................................................2-4

3.5 Antenna Switch...............................................................................................2-5

3.6 Harmonic Filter...............................................................................................2-5

3.7 Power Control.................................................................................................2-5

4.0 VHF (136-174MHz) Frequency Synthesis ...........................................................2-6

4.1 Reference Oscillator.......................................................................................2-6

4.2 Fractional-N Synthesizer ................................................................................2-6

4.3 Voltage Controlled Oscillator (VCO)...............................................................2-7

4.4 Synthesizer Operation....................................................................................2-8

5.0 VHF (136-174MHz)

Transmitter Power Ampliﬁer (PA) 45 W.....................2-9

5.1 Power Controlled Stage..................................................................................2-9

5.2 Pre-Driver Stage...........................................................................................2-10

5.3 Driver Stage..................................................................................................2-10

5.4 Final Stage ...................................................................................................2-10

5.5 Directional Coupler.......................................................................................2-10

5.6 Antenna Switch.............................................................................................2-11

5.7 Harmonic Filter.............................................................................................2-11

5.8 Power Control...............................................................................................2-11

Motorola GM Series Service Information

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