DE
DANIELS
ELECTRONICS
UHF Amplifier Instruction Manual UT-3/UT-4 406 - 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
