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Building the Morse code keyer is very straightforward. You can use either the original BASIC STAMP, as shown in Fig. 12-1, or the alternative STAMP to build this project. Simply translate the correct input/output pins on the alternative STAMP pins. The Morse keyer can be built on a perfboard, a point-to-point wiring board, or the STAMP 2 carrier board, or you could build your own custom circuit board if desired. Using an integrated
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TABLE 12-1 CHARACTER
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MORSE CODE CHARACTERS AND THEIR ENCODED EQUIVALENTS MORSE BINARY DECIMAL CHARACTER MORSE BINARY DECIMAL
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01000010 10000100 10100100 10000011 00000001 00100100 11000011 00000100 00000010 01110100 10100011 01000100 11000010 10000010 11100011 01100100 11010100 01000011
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00000011 10000001 00100011 00010100 01100011 10010100 10110100 11000100 11111101 01111101 00111101 00011101 00001101 00000101 10000101 11000101 11100101 11110101
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12Vdc
Programming port P1
S1 P2 P3
1 2 3 4 5 6 TX RX ATN GND P0 P1 P2 P3 P4 P5 P6 P7 VCC 24 23 22 21 20 19 18 17 16 15 14 13
DB-9 female
4 5 6 7
BASIC STAMP 2
GND RST 5V P15
S2 5V
P14 P13 P12 P11 P10 P9 P8
7 8 9 10 11
R1 S3
P4 GND PTT R1
R2 R3 R4 5V S5 S6
0.047 F C2 Mic C1 0.1 F
Figure 12-1 Morse keyer.
PROGRAMMING THE KEYER 165
circuit socket for the BASIC STAMP 2 microprocessor is highly recommended. When assembling your Morse code keyer be sure to observe the correct polarity when installing capacitors, diodes, and transistors, to ensure your circuit will operate correctly when power is first applied. The Morse keyer circuit is mounted in a small plastic enclosure with the on/off switch and reset switch and the four custom message buttons on the front or top of the case. The power switch S1 is an SPST toggle switch, while the system reset button S2 is a momentary pushbutton switch. Switches S3, S4, S5, S6 are the custom message momentary push buttons. Note the 10-k pull-up resistors across the input pushbutton switches. The two outputs from the Morse keyer are at pins 5 (P0) and 6 (P1). The audio output signal is provided at P1 through two capacitors C1 and C2, which are interfaced to your transceiver. The output at P0 is the push to talk (PTT) line. The output signal at P0 is fed to a 1-k resistor coupled to an npn transistor. The transistor Q1 is used to drive the PTT relay which is used to turn on your ham radio transceiver, thus keying your radio. A low-current reed relay is used to send Morse code. Reed relays are very fast, have a long life, and consume low power, which is ideal for this application. The PTT and audio output lines are brought out to the rear panel of the Morse code keyer and connected to a 1 8-in stereo jack. You may wish install an external coaxial power jack on the rear panel as well. You could build a cable with a 1 8-in stereo plug at one end and a suitable microphone connector at the opposite end of the cable. The programming cable is connected to pins 1 through 4 of the BASIC STAMP 2. A 4-pin male header could be mounted on the circuit board for the programming cable. A programming cable could be fabricated with a 4-pin female header and a length of flexible 4-conductor telephone cable connected to a 9-pin serial RS232 connector. The Morse keyer can be powered by a 9-V transistor radio battery if desired; this would facilitate building a compact or portable unit. Or the keyer could be powered from a 12-V system power bus. A variation on the Morse code keyer project would be to design a multipurpose keyer for home station use, with the addition of a voice message chip such as an ISD2590 chip, used in the radio mailbox project (Chap. 14). The ISD voice recorder chip could be used for voice message keying in addition to Morse code keying if desired. The voice message chip could be implemented using some additional parts if desired, as shown in Fig. 12-2.
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