Table of Contents
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1
Introduction .............................................................................................................................................. 1
2
Features ..................................................................................................................................................... 2
3
Components .............................................................................................................................................. 2
4
Building the PC Board .............................................................................................................................. 3
5
Building the Case ..................................................................................................................................... 8
6
Installing the PC Board in the Case ........................................................................................................ 13
7
Using the EZKeyer III ............................................................................................................................ 15
7.1
Powering the EZKeyer III .............................................................................................................. 15
7.2
Installing a larger speaker ............................................................................................................... 15
7.3
Installing a Knob on the Speed Pot ................................................................................................ 16
7.4
Quick test before using ................................................................................................................... 16
7.5
Getting familiar with the EZKeyer III ............................................................................................ 16
8
EZKeyer III Commands ......................................................................................................................... 18
Appendix A - Mute Timing Diagram ............................................................................................................ 20
Appendix B - EZKeyer III PC Board Schematic ........................................................................................... 22
Appendix C - EZKeyer III PC Board Parts Placement .................................................................................. 23
Appendix D - EZKeyer III Parts List ............................................................................................................. 24
1
Introduction
This full featured PIC-based iambic Morse code keyer features three memories and is very easy use. It
has many of the features of the high end keyers while maintaining ease of use. Commands are entered
AAØZZ EZKeyer III 23 November 2014
EZKeyer III
By Craig Johnson, AAØZZ
A Complete, Easy-to-Use, Standalone CW Keyer
TABLE OF CONTENTS
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Copyright 2014 AAØZZ
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Table of Contents
Summary of Contents for Four State QRP Group EZKeyer III
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Page 1: Table Of Contents
EZKeyer III Commands ......................... 18 Appendix A – Mute Timing Diagram ......................20 Appendix B – EZKeyer III PC Board Schematic ................... 22 Appendix C – EZKeyer III PC Board Parts Placement .................. 23 Appendix D – EZKeyer III Parts List ......................24 Introduction This full featured PIC-based iambic Morse code keyer features three memories and is very easy use. -
Page 2: Features
The printed circuit board, case, and PIC microcontroller code were designed and developed for the Four State QRP Group by Craig Johnson, AAØZZ. Using a PC board that is only 2" x 2", this is an EZ-to-build, small footprint project with large impact on your operating capabilities, whether in the shack or in the field. -
Page 3: Building The Pc Board
4 Building the PC Board This is the bare PC board. Figure 4.1 - Bare Board ___ Break off the two shims (Figure 4.2) Figure 4.2 – Board with Shims Removed AAØZZ EZKeyer III 23 November 2014 - 3 - Copyright 2014 AAØZZ... - Page 4 ___ Once again, make sure you have the shims as shown in Figure 4.4. Make sure the "R1 Shim" labels are as shown in the picture. This is very important; the speed pot will not work if one or both of these shims are turned over. AAØZZ EZKeyer III 23 November 2014 - 4 - Copyright 2014 AAØZZ...
- Page 5 Trim the wire/solder connections close to the board. It's important to make sure the solder point does not contact the body of the pot when it's installed later. AAØZZ EZKeyer III 23 November 2014 - 5 - Copyright 2014 AAØZZ...
- Page 6 If you will be installing the optional speaker, you can install it later. ___ Install the 4-pin header in HDR1. Solder. AAØZZ EZKeyer III 23 November 2014 - 6 - Copyright 2014 AAØZZ...
- Page 7 If you are using one of the external speakers you may want to turn it back a bit after testing in the case. Figure 4.8 shows the completed PC Board. AAØZZ EZKeyer III 23 November 2014 - 7 - Copyright 2014 AAØZZ...
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Page 8: Building The Case
Solder all four corners. Here is what the case looks like at first. Figure 5.1 – Case Outside Figure 5.2 – Case Inside ___ Break apart the 6 pieces. Figure 5.3 AAØZZ EZKeyer III 23 November 2014 - 8 - Copyright 2014 AAØZZ... - Page 9 5.5b). Make sure the end piece with the three holes is at the top side of the box so you can read the silkscreened commands when you turn it over. As you solder, heat both boards of the edge simultaneously with a blunt-tipped soldering iron. Low wattage is sufficient. AAØZZ EZKeyer III 23 November 2014 - 9 - Copyright 2014 AAØZZ...
- Page 10 ___ Place a small solder “blob” in the center of one of the long edges of the bottom board. A low- wattage, blunt-tipped soldering iron is sufficient. See Figure 5.6. Figure 5.6 – Solder “Blob” on First Edge AAØZZ EZKeyer III 23 November 2014 - 10 - Copyright 2014 AAØZZ...
- Page 11 Look at the silk screened commands on the other side of the bottom board and make sure the end piece with the three holes is on the top side as you read the command list. AAØZZ EZKeyer III 23 November 2014 - 11 - Copyright 2014 AAØZZ...
- Page 12 (Figure 5.11). You don’t have to solder the entire edges but there is no harm if you want to. Figure 5.11 – Extra Solder Along Bottom Edges ___ In a similar manner, solder the vertical edges of the four corners (Figure 5.12). AAØZZ EZKeyer III 23 November 2014 - 12 - Copyright 2014 AAØZZ...
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Page 13: Installing The Pc Board In The Case
___ Attach the 3-cell AA battery pack to the PCB. (See Figure 4.8) Solder the red wire to the + terminal and the black wire to the other terminal. WATCH THE POLARITY! AAØZZ EZKeyer III 23 November 2014 - 13 -... - Page 14 .238" shaft works best but a knob for a .250" shaft works OK also. The diameter should be about .5" or so. Some possibilities are: DigiKey 226-4092-ND (.238") DigiKey 250-1742-ND (.250") Radio Shack #274-415 (.250") Radio Shack #274-018 (.250") AAØZZ EZKeyer III 23 November 2014 - 14 - Copyright 2014 AAØZZ...
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Page 15: Using The Ezkeyer Iii
PCB or you can use a piece of foam or other material. If you use the large Digikey piezo (102-2200-ND), make sure you mount it with the larger hole facing forward (toward the enclosure grid). AAØZZ EZKeyer III 23 November 2014 - 15 - Copyright 2014 AAØZZ... -
Page 16: Installing A Knob On The Speed Pot
Then plug in a paddle and send a little code. If you can hear the code you are sending, all should be well. 7.5 Getting familiar with the EZKeyer III The default speed is 15 wpm to enable most ops to begin using the commands easily. Set the speed where you like it using the “S”... - Page 17 Doing it again toggles the sidetone back on. Even when the sidetone is turned off the keyer uses its speaker for commands. AAØZZ EZKeyer III 23 November 2014 - 17 - Copyright 2014 AAØZZ...
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Page 18: Ezkeyer Iii Commands
DAH paddle can be used in Straight-key mode. Response is "B" when the keyer enters Bug- emulate mode, “S” when the keyer enters “Straight-key” mode, or “K” when the keyer enters Keyer mode. AAØZZ EZKeyer III 23 November 2014 - 18 - Copyright 2014 AAØZZ... - Page 19 DIT requesting the next character, etc. If the user wants a space he just waits for another DIT without entering any character (about 2 seconds), indicating the space was saved in the AAØZZ EZKeyer III 23 November 2014 - 19 -...
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Page 20: Appendix A - Mute Timing Diagram
The ideal DAH-to-Space ratio is always 3.0 With Mute on (as shown above): At 25 WPM the DIT-to-Space ratio is 41/55 = .74 At 25 WPM the DAH-to-Space ratio is 137/55 = 2.49 AAØZZ EZKeyer III 23 November 2014 - 20 - Copyright 2014 AAØZZ... - Page 21 At 5 WPM the DAH-to-Space ratio is 713/247 = 2.89 At 50 WPM the DIT-to-Space ratio is 17/31 = .55 At 50 WPM the DAH-to-Space ratio is 65/31 = 2.1 AAØZZ EZKeyer III 23 November 2014 - 21 - Copyright 2014 AAØZZ...
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Page 22: Appendix B - Ezkeyer Iii Pc Board Schematic
Appendix B – EZKeyer III PC Board Schematic AAØZZ EZKeyer III 23 November 2014 - 22 - Copyright 2014 AAØZZ... -
Page 23: Appendix C - Ezkeyer Iii Pc Board Parts Placement
Appendix C – EZKeyer III PC Board Parts Placement AAØZZ EZKeyer III 23 November 2014 - 23 - Copyright 2014 AAØZZ... -
Page 24: Appendix D - Ezkeyer Iii Parts List
Appendix D – EZKeyer III Parts List (D) DigiKey Quantity Designator Description (M) Mouser Other 4SQRP PARTS 0.1 uF, monolithic, radial (D) BC1148CT-ND (small yellow, "104" or blue) (M) 80-C317C104M5U (D) 1N4148FS-ND D1, D2 1N4148 diode (M) 625-1N4148 1N5817 Schottky diode (D) 1N5817FSCT-ND Q1.
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