VHF Transmitter Ampli
fi
er Instruction Manual
IM21-VT3150AMP
v
Contents
General Information ...............................................................
5
Introduction ................................................................................................
5
Performance Speci
fi
cations .......................................................................
6
Theory of Operation ..............................................................
7
Ampli
fi
er Operation ....................................................................................
7
Power Requirements .................................................................................
8
VHF Transmitter Ampli
fi
er Current Consumption ........................................... 8
RF Circuitry ................................................................................................
8
VHF Transmitter Ampli
fi
er Lowpass Filter ...................................................... 8
Power Control Circuitry ..............................................................................
8
Power Sensing Circuitry.............................................................................
8
Output Power Sense ...................................................................................... 9
VSWR Sense.................................................................................................. 9
VSWR Overload ............................................................................................. 9
VHF Transmitter Ampli
fi
er Alignment ....................................
11
Repair Note..............................................................................................
11
Recommended Test Equipment List ........................................................
12
General ....................................................................................................
12
Standard Factory Settings and Jumper Con
fi
guration .............................
13
VHF Transmitter Ampli
fi
er Alignment .......................................................
13
VHF Transmitter Ampli
fi
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 Veri
fi
cation .................................................................................. 16
Illustrations and Schematics ................................................
17
VT-3/150 Tranmitter Ampli
fi
er Component Layout ...................................
18
VT-3/150 Tranmitter Ampli
fi
er Schematic Diagram ..................................
19
VT-3/150 Ampli
fi
er Low Pass Filter Component Layout...........................
20
VT-3/150 Ampli
fi
er Low Pass Filter Schematic Diagram..........................
20
Parts Lists ............................................................................
21
VHF Transmitter Ampli
fi
er Electrical Parts List ........................................
21
VHF Transmitter Ampli
fi
er Mechanical Parts List.....................................
24
Revision History ...................................................................
25
