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Manuals and User Guides for ozQRP MST3. We have
1
ozQRP MST3 manual available for free PDF download: Construction And Operation Manual
ozQRP MST3 Construction And Operation Manual (60 pages)
SSB TRANSCEIVER BOARD KIT
Brand:
ozQRP
| Category:
Transceiver
| Size: 3.17 MB
Table of Contents
Table of Contents
2
Introduction
5
Block Diagram
7
Figure 1 MST3 Block Diagram
7
Circuit Description
8
Carrier Oscillator
8
SSB Generator
8
Crystal Filter
9
Transmit Mixer
9
Power Amplifier
9
Power Supply and RX/TX Switching
10
Receive Mixer
10
Product Detector
10
Audio Power Amplifier
11
Audio AGC
11
Intelligent Tone Module
12
Overview
12
Circuit Operation
12
Figure 2 Carrier Oscillator
14
Figure 3 Balanced Modulator
15
Figure 4 Crystal Filter
16
Figure 5 Transmit Mixer
17
Figure 6 Power Amplifier and RX/TX Switching
18
Figure 7 Receive Mixer
19
Figure 8 Receive Audio
20
Kit Supplied Parts
21
Individual Parts List
23
Off Board Parts
26
Main Board Construction
27
General
27
Construction Steps
28
Figure 9 Component Overlay
37
Band Pass Filters
38
Circuit Description
38
Figure 10 BPF Schematic
38
Figure 11 Completed BPF
38
Construction
39
Figure 12 BPF Overlay
40
Table 1 BPF Components
41
Low Pass Filter
42
Circuit Description
42
Construction
42
Figure 13 LPF Schematic
42
Figure 14 LPF Overlay
43
Figure 15 Completed LPF
43
Table 2 LPF Components
44
Adding Avfo
45
Table 3 VFO Selection
45
Enclosure
46
Front Panel
46
Rear Panel
46
Figure 16 MST3 in an Enclosure
46
Mounting the PCB
47
Figure 17 MST3 Board and Rear Panel
47
Wiring up
48
General
48
Headers
48
Power Supply
48
Antenna
48
Key Socket
48
Switches
48
12.7 Vfo
48
Figure 18 Wiring Diagram
49
Testing and Alignment
50
General
50
Power on
50
Receive
51
Carrier Balance
51
Receive BPF
51
Transmit
51
PA Bias Setup
51
Transmit BPF
52
Table 4 Typical Circuit Voltages
53
Audio AGC Adjustment
54
Carrier Frequency Adjustment
55
Figure 20 Carrier Frequency and Crystal Filter Relationship
56
Operation
57
Power on
57
Receive State
57
SSB Mode
58
Introduction
58
Operation
58
CW Mode
59
Introduction
59
Operation
59
Test Tones
60
Entering a Callsign
60
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