User's Guide

DE
DANIELS
ELECTRONICS
UHF Amplifier Instruction Manual UT-3 406 - 512 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 ......................................................................................... 2-2
2.3 RF Circuitry...................................................................................................... 2-2
2.3.1 UT-3/400 Lowpass Filter...................................................................... 2-2
2.4 Power Control Circuitry.................................................................................... 2-3
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 UT-3/400 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 UT-3/400 Amplifier Alignment......................................................................... 3-2
3.6.1 General.................................................................................................. 3-2
3.6.2 UT-3/400 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 UT-3/400 UHF Amplifier Component Layout.................................................. 4-2
4.2 UT-3/400 UHF Amplifier Schematic Diagram ................................................. 4-3
4.3 UT-3/400 UHF Lowpass Filter Component Layout ......................................... 4-5
4.4 UT-3/400 UHF Lowpass Filter Schematic Diagram......................................... 4-5