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CONTENTS AT A GLANCE About Morse Code Building the Keyer Programming the Keyer Morse Keyer Parts List
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Morse code is probably the oldest form of serial communication protocol still in use
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today. Despite the age of Morse code, it has some virtues that make it viable as a means of communication even today. Morse code offers inherent compression; the letter E is transmitted in one-thirteenth the time it takes to send the letter Q. Morse code requires much less transmitted power compared with other modulation methods. Morse code also requires much less bandwidth and can often get through when other methods of communication fall short. Morse code can be sent and received by humans or by automated equipment.
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About Morse Code
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Although Morse code has fallen out of favor as a means of sending large messages, it is still legal and often a preferred method to communicate when operating QRP or low power, or when conditions are marginal. As the old saying goes, When nothing else can get through,
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162 MORSE CODE RADIO KEYER PROJECT
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CW can! Those in the ever-growing QRP movement build low-power portable transceivers often run by batteries. Continuous-wave (CW) transceivers require far fewer parts and are simpler to build. CW is also a preferred way to identify automated repeater and beacon stations. The Morse keyer is great for local VHF/UHF code practice sessions. The BASIC STAMP 2, with its ease of programming and low power requirement, make it ideal for the Morse code keyer project. The Morse code keyer project can be utilized to key your favorite amateur radio transceiver and send Morse code automatically for you. The Morse keyer can be programmed for up to four preset messages. Canned messages are popular with amateur radio operators for sending basic parameters of exchange. One message can be used for calling CQ, i.e., looking to contact others. One message can give your location, and another message could be used to describe your station operating conditions. The characters of the Morse code are represented by sequences of long and short beeps known as dots and dashes (or dits and dahs). There are one to six beeps or elements in the characters of the standard Morse code. The first step in writing a program to send Morse code is to devise a compact way to represent sequences of elements, and an efficient way to play them back. The chart shown in Table 12-1 illustrates the encoding scheme used in this program. A single byte represents a Morse character. The highest 5 bits of the byte represent the actual dots (0s) and dashes (1s), while the lower 3 bits represent the number of elements in the character. For example, the letter F is a dot, dash, dot, dot, so it is encoded as 0010X100, where X is a don t care bit. Since Morse characters can contain up to six elements, we have to handle the exceptions. Fortunately, there is some excess capacity in the number-of-elements portion of the byte, which can represent numbers up to 7. Therefore, we can assign a six-element character ending in a dot the number 6, while a six-element character ending in a dash gets the number 7. The program shows how these bytes can be played back to produce Morse code. The table of symbols at the beginning of the program listing contains the timing data for the dots and dashes themselves. If you need or want to change the program sending speed, you will just enter new values for the dit_length, dah_length, etc. Remember, you will need to keep the timing relationships roughly the same; a dash should be about 3 times as long as a dot. The Morse keyer program uses the BASIC STAMP s lookup function to play sequences of Morse characters. Lookup is a particularly modern feature of STAMP BASIC in that it is an object-oriented data structure. It not only contains the data, but it also knows how to retrieve it.
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