QRP Labs QCX 50W Amp Manuals

Manuals and User Guides for QRP Labs QCX 50W Amp. We have 1 QRP Labs QCX 50W Amp manual available for free PDF download: Assembly Manual

QRP Labs QCX 50W Amp Assembly Manual (70 pages)

50W HF QCX Power Amplifier kit, A low-cost, 50W Power Amplifier for the QCX with Full-break-in QSK solid state Tx/Rx switching

Brand: QRP Labs | Category: Amplifier | Size: 7.23 MB

Table of Contents
2
INTRODUCTION - PCB Rev 2
4
General Assembly Guidelines
4
Assembly
5
Parts List
6
Trace Diagram and Parts Layout
10
Wind and Install Output Transformer T3
10
Wind and Install Low Pass Filter Inductor L6
13
Wind and Install Low Pass Filter Inductors L4 and L7
14
Wind and Install Bifilar Transformer T2
14
Wind and Install Trifilar Transformer T1
17
Install Low Pass Filter Capacitors C14 and C18
19
Install Low Pass Filter Capacitors C11 and C12
20
Install Low Pass Filter Capacitors C19 and C20
21
Install Low Pass Filter Capacitors C9 and C21
22
Install Capacitors C1, 2, 3, 6, 7, 13 and 16
22
Install Capacitors C4 and C5
23
Install Capacitors C8 and C10
23
Install Diodes D2, 4, 6, 8, 9 and 10
24
Install Diodes D1, 3, 5 and 7
24
Install Inductors L1, 2, 3, 5, 8, 9 and 10
25
Install Resistors R7, 10, 11, 14 and 17
25
Install Resistor R15
26
Install Resistor R16
26
Install Resistor R8
27
Install Transistor Q3
27
Install Transistor Q4
28
Install Transistors Q5 and 6
28
Install IC1
29
Install Resistors R1, R6 and R9
29
Install Resistors R12 and R13
30
Install Resistor R3
30
Install Resistors R2 and 4
31
Install Trimmer Resistor R5
31
Install Capacitors C15 and 17
32
Install Connector X4: DC Power in
32
Install Connector X2: PTT (Key)
33
Install Connector X1 and 3: RF in and out
33
Install Leds D11 and 12
34
ENCLOSURE OPTION: PA Transistor Installation
35
ENCLOSURE OPTION Installation
37
Circuit Explanation
42
Schematic
42
Input Attenuator
44
Power Amplifier
44
Thermal Considerations
50
Low Pass Filter
52
Transmit / Receive Switching
53
Amplifier Set-Up and Operation
64
PA Precautions
64
Power Supply
65
Connection to QCX
65
Adjustment
66
Supply Voltage Value and Power Output
66
Measurements
67
Power Output Vs Supply Voltage
67
Low Pass Filter Characteristics
68
Keying Envelope
68
Version History
69

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QRP Labs QCX 50W Amp Assembly Manual (70 pages)

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