User Manual

DE
DANIELS
ELECTRONICS
VHF Amplifier Instruction Manual VT-3 132 - 174 MHz 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 ............................................................................ 2-2
2.3.1 VT-3/150 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 .................................................................. 2-3
2.5.3 VSWR Overload .............................................................. 2-4
3 VT-3/150 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 Circuitboard Numbering Convention ....................................... 3-2
3.5 Standard Factory Settings and Jumper Configuration ............................. 3-2
3.6 VT-3/150 Amplifier Alignment ....................................................... 3-2
3.6.1 General......................................................................... 3-2
3.6.2 VT-3/150 Amplifier Adjustment ............................................. 3-3
3.6.2.1 General Set-Up....................................................... 3-3
3.6.2.2 Output Power Alarm (Forward Power) ........................... 3-4
3.6.2.3 Output Power......................................................... 3-5
3.6.2.4 Antenna VSWR Alarm (Reverse Power).......................... 3-5
3.6.2.5 Antenna VSWR Overload ........................................... 3-6
3.6.2.6 Procedure Verification ............................................... 3-6
4 ILLUSTRATIONS AND SCHEMATIC DIAGRAMS .................................... 4-1
4.1 VT-3/150 VHF Amplifier Component Layout...................................... 4-2
4.2 VT-3/150 VHF Amplifier Schematic Diagram ...................................... 4-3
4.3 VT-3/150 VHF Lowpass Filter Component Layout............................... 4-5
4.4 VT-3/150 VHF Lowpass Filter Schematic Diagram ............................... 4-5