User's Guide

VHF Transmitter Amplifi er Instruction Manual
IM21-VT3150AMP
v
Contents
General Information ...............................................................5
Introduction ................................................................................................5
Performance Specifi cations .......................................................................6
Theory of Operation ..............................................................7
Amplifi er Operation ....................................................................................7
Power Requirements .................................................................................8
VHF Transmitter Amplifi er Current Consumption ........................................... 8
RF Circuitry ................................................................................................8
VHF Transmitter Amplifi er Lowpass Filter ...................................................... 8
Power Control Circuitry ..............................................................................8
Power Sensing Circuitry............................................................................. 8
Output Power Sense ...................................................................................... 9
VSWR Sense.................................................................................................. 9
VSWR Overload ............................................................................................. 9
VHF Transmitter Amplifi er Alignment ....................................11
Repair Note.............................................................................................. 11
Recommended Test Equipment List ........................................................ 12
General .................................................................................................... 12
Standard Factory Settings and Jumper Confi guration ............................. 13
VHF Transmitter Amplifi er Alignment ....................................................... 13
VHF Transmitter Amplifi er Adjustment.......................................................... 13
General Set-Up............................................................................................. 14
Output Power Alarm (Forward Power).......................................................... 14
Output Power................................................................................................ 15
Antenna VSWR Alarm (Reverse Power) ...................................................... 15
Antenna VSWR Overload............................................................................. 16
Procedure Verifi cation .................................................................................. 16
Illustrations and Schematics ................................................ 17
VT-3/150 Tranmitter Amplifi er Component Layout ................................... 18
VT-3/150 Tranmitter Amplifi er Schematic Diagram .................................. 19
VT-3/150 Amplifi er Low Pass Filter Component Layout........................... 20
VT-3/150 Amplifi er Low Pass Filter Schematic Diagram.......................... 20
Parts Lists ............................................................................ 21
VHF Transmitter Amplifi er Electrical Parts List ........................................ 21
VHF Transmitter Amplifi er Mechanical Parts List..................................... 24
Revision History ................................................................... 25