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DKB-2010
Hal Communications DKB-2010 Mode Keyboard Manuals
Manuals and User Guides for Hal Communications DKB-2010 Mode Keyboard. We have
1
Hal Communications DKB-2010 Mode Keyboard manual available for free PDF download: Instruction Manual
Hal Communications DKB-2010 Instruction Manual (101 pages)
Dual mode keyboard
Brand:
Hal Communications
| Category:
Keyboard
| Size: 5 MB
Table of Contents
Table of Contents
3
Specifications
6
General Information
8
Description
8
Instrument Identification
8
Accessories Furnished
9
Manual Preview
9
Section II: Installation
10
Initial Inspection
10
Preliminary Checkout
10
CW Transmitter Keying Connections
10
RTTY Loop Connections
12
Audio Output Connections
14
Section III: Operating Your Keyboard
15
Introducing
15
RTTY Operation
15
Table 3.1: Characters Produced by Bracketed Keys
15
Figure 3.1 Location of Controls and Keys
16
Morse Code Operation
17
Section IV: Theory of Operation
18
Introducing
18
General Operating Principles
18
Circuit Analysis
19
Scanning Keyboard Encoder
21
ROM Code Converter
22
Storage Buffer
22
RTTY Control and Decoding Circuit
23
Shift Register and Control Circuit
24
RTTY Encoder and Loop Interface
27
Figure 4.4: Generation of the Letters-Shift Code
28
RTTY Timing Chain
29
Table 4.1: RTTY Timing Chain Output Frequencies
29
RTTY Character Counter
30
Morse Character Generator
30
Figure 4.7 Production of Dots by the Morse Character Generator
31
Figure 4.8 Production of Dashes by the Morse Character Generator
32
Morse Output Control
33
Quick Brown Fox and ID Control
34
Identifier
35
Figure 4.10 Development of Clock Pulses for Automatic Character Sequencers
35
Three-Character Sequencer
36
Power Supply
36
Character Codes
37
Table 4.2: ASCII Character Codes Used in the DKB-2010
38
Table 4.5: Morse Codes
41
Assembly Instructions
42
Table 5.1 Coding Chart for Identifier
43
Figure 5.14 Diode Placement in Identifier Matrix
46
Section VI: Maintenance
47
Table 6.1 Test Points - Logic Circuit Board
51
Figure 6.1 Logic Circuit Board Test Points
52
Figure 6.2 Keyswitch Circuit Board Test Points
53
Figure 6.3 Power Supply Circuit Board Test Points
54
Table 6.2 DKB Logic Board Connector (J305)
55
Table 6.4 DKB-2010 Wire List
57
Table 6.5: Integrated Circuit Pin Numbers for Ground and Power
58
Section VII: Parts List
59
Section VIII: Diagrams
62
Figure 8.2: Drawing Conventions
62
Figure 8.3: Keyboard Encoder
62
Figure 8.4: ROM Code Converter and Buffer Control
62
Figure 8.5: RTTY Control and Decoder
62
Figure 8.6: Shift Register Control
62
Figure 8.7: RTTY Encoder and Loop Interface
62
Figure 8.8: RTTY Timing Chain
62
Figure 8.9: RTTY Character Counter
62
Figure 8.10: Morse Character Generator
62
Extended Memory Option
96
Introduction
97
Installation
97
Operating Instructions
98
Theory of Operation
99
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