User's Guide

DANIELS

ELECTRONICS LTD.

VT-3H040 VHF Amplifier Instruction Manual IM20-VT3040AMP iii

TABLE OF CONTENTS

Page

1 GENERAL....................................................................................................................1-1

1.1 Introduction.......................................................................................................1-1

1.2 Performance Specification................................................................................1-1

2 THEORY OF OPERATION.........................................................................................2-1

2.1 Amplifier Operation..........................................................................................2-1

2.2 Power Requirements .........................................................................................2-1

2.3 RF Circuitry ......................................................................................................2-1

2.3.1 VT-3H040 Lowpass Filter ................................................................................2-2

2.4 Power Control Circuitry....................................................................................2-2

2.5 Power Sensing Circuitry ...................................................................................2-3

2.5.1 Output Power Sense..........................................................................................2-3

2.5.2 VSWR Sense.....................................................................................................2-4

2.5.3 VSWR Overload ...............................................................................................2-4

3 VT-3H040 AMPLIFIER ALIGNMENT ......................................................................3-1

3.1 General..............................................................................................................3-1

3.2 Repair Note .......................................................................................................3-1

3.3 Recommended Test Equipment List.................................................................3-1

3.4 Printed Circuit Board Numbering Convention .................................................3-2

3.5 Standard Factory Settings and Jumper Configuration ......................................3-2

3.6 VT-3H040 Amplifier Alignment ......................................................................3-2

3.6.1 General..............................................................................................................3-2

3.6.2 VT-3H040 Amplifier Adjustment.....................................................................3-3

4 ILLUSTRATIONS AND SCHEMATIC DIAGRAMS ...............................................4-1

4.1 VT-3H040 Output Lowpass Filter Component Layout....................................4-1

4.2 VT-3H040 Output Lowpass Filter Schematic Diagram ...................................4-1

4.3 VT-3H040 Amplifier Component Layout ........................................................4-2

4.4 VT-3H040 Amplifier Schematic Diagram........................................................4-3

5 PARTS LISTS ..............................................................................................................5-1

5.1 VT-3H040 Amplifier Electrical Parts List........................................................5-1

5.2 VT-3H040 Lowpass Filter Electrical Parts List ...............................................5-4

5.3 VT-3H040 Amplifier Mechanical Parts List ....................................................5-4

6 REVISION HISTORY..................................................................................................6-1