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Heathkit SB-644A
Heath Heathkit SB-644A Manuals
Manuals and User Guides for Heath Heathkit SB-644A. We have
2
Heath Heathkit SB-644A manuals available for free PDF download: Manual, Schematic Diagram
Heath Heathkit SB-644A Manual (98 pages)
Remote VFO
Brand:
Heath
| Category:
Measuring Instruments
| Size: 25 MB
Table of Contents
Table of Contents
4
Introduction
5
Unpacking
6
Assembly Notes
7
Tools
7
Soldering
8
Parts
9
Resistor Color Code
9
Capacitors
9
XTAL OSC/SW Circuit Board
10
Parts List
10
Step by Step Assembly
12
A Good Solder Connection
13
Poor Solder Connections
13
Solder Bridges
13
Variable Frequency Oscillator
19
Oscillator Circuit Board
21
Buffer Circuit Board
23
VFO Enclosure
26
Chassis
32
Lamp Assemblies
34
VFO Drive Assembly
35
Switch Mounting
38
Remote Main Switch Wiring
39
Remote-Crystal Switch Wiring
40
Chassis Wiring
41
VFO Cable Preparation
43
Under Chassis Wiring
45
Front Panel Assembly
48
Indicator Lamp Wiring
53
Cable Preparation
58
Initial Tests
60
Tests and Adjustments
62
VFO Frequency Adjust
63
VFO Level Adjust
64
Crystal Level Adjust
64
Crystal Trimmer Adjustment
65
Final Assembly
66
Operation
68
Variable Frequency Operation
68
Special Crystal Considerations
69
Crystal Frequency Operation
69
Crystal Selection for Net Operation
69
In Case of Difficulty
71
Visual Tests
71
Precautions for Troubleshooting
72
Troubleshooting Chart
72
Test Circuit Assembly and Use
73
Isolation Test - RF Voltmeter
74
Voltage Charts
76
VFO Flow Chart
77
Specifications
78
Circuit Description
79
XTAL Oscillator
80
VFO Switching
80
Switches
80
Circuit Board X-RAY Views
82
Switch Circuit Board
83
Chassis Photographs
84
Identification Chart
86
Illustration Booklet
87
VFO Parts Pictorial
88
Chassis Parts Pictorial
90
Replacement Parts
95
Repair Service
95
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Heath Heathkit SB-644A Schematic Diagram (1 page)
Remote VFO
Brand:
Heath
| Category:
Accessories
| Size: 1 MB
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