Hal Communications DKB-2010, Instruction Manual, Page: 3 / 101

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TABLE OF CONTENTS
Specifications ........................................................................... 4
Section I: General Information
1.1 Description ....................................................... 6
1.2 Instrument Identification .................................... 6
1.3 Accessories Furnished ........................................ 7
1.4 Manual Preview ................................................. 7
Section II: Installation
2.1 Initial Inspection ................................................ 8
2.2 Preliminary Checkout .......................................... 8
2.3 CW Transmitter Keying Connections .................... 8
2.4 RTTY Loop Connections ..................................... 10
2.5 Audio Output Connections .................................. 12
Section III: Operating your Keyboard
3.1 Introducing ....................................................... 13
3.2 RTTY Operation ................................................. 13
3.3 Morse Code Operation ....................................... 15
Section IV: Theory of Operation
4.1 Introducing ....................................................... 16
4.2 General Operating Principles ............................... 16
4.3 Circuit Analysis .................................................. 17
4.4 Scanning Keyboard Encoder ............................... 19
4.5 ROM Code Converter ......................................... 20
4.6 Storage Buffer ................................................... 20
4.7 RTTY Control and Decoding Circuit ...................... 21
4.8 Shift Register and Control Circuit ........................ 22
4.9 RTTY Encoder and Loop Interface ....................... 25
4.10 RTTY Timing Chain ........................................... 27
4.11 RTTY Character Counter .................................... 28
4.12 Morse Character Generator ................................ 28
4.13 Morse Output Control ........................................ 31
4.14 Quick Brown Fox and ID Control ........................ 32
4.15 Identifier .......................................................... 33
4.16 Three-Character Sequencer ................................ 34
4.17 Power Supply ................................................... 34
4.18 Character Codes ............................................... 35
Section V: Assembly Instructions ............................................ 40
Section VI: Maintenance .......................................................... 45
Section VII: Parts List .............................................................. 57
Section VIII: Diagrams .............................................................. 60
Extended Memory Option
1. Introduction ..................................................................... A1
2. Installation ...................................................................... A2
3. Operating Instructions ...................................................... A3
4. Theory of Operation ........................................................ A4
Schematic ............................................................................ A5
Key Buffer Timing ................................................................ A6