Ferry van Eeuwen
CW or Morse
The Mother of all Modes!
Imagine that you have invented the transmitter. What now? How can we use a transmitter signal to send messages? What could be more simple than switching a unmodulated transmitter signal 'On' and 'Off'? It was the natural thing to do. So far so good. All we had to do now was designing a protocol so that the switched signal could be 'read'. Their was the logical choice between a short transmission and a longer one and then combining the 'dots' and 'dashes' in patterns which were related to the letters in the alphabet and to the numerical characters. Take care to clearly distinguish the dots from the dashes, by for instance making the dashes three times longer in duration than the dots. There we go. That was what more or less happened in a rather simplified way. Samuel Morse showed us the way. Some interesting sites with a lot of information about Samuel Morse and the Morse code in general are mentioned below. Although the Morse code has changed quite a bit since the invention of Samuel Morse, he is considered to be the undisputed inventor of the Morse Code.
The term CW, short for Continuous Wave is a little misleading. A continuous wave is normally a 'carrier on' situation, with no modulation present on the carrier. Voice is for instance a carrier modulated signal. The continuous wave signal is keyed in an 'on and off' in the rhythm of the Morse code. Some use the term CW meaning sending the Morse code. Others call it just Morse. CW or Morse is considered to be - don't be shocked - a fuzzy mode. It is not coded, rather it is a natural language. The signal is read from the receiver without any change to time of arrival of data or content of data. Computer reception of Morse, which requires electronic decisions, must always perform worse than a human expert. If you can handle Morse and have tried out one or more of the available Morse decoders you know that this is true. Another reason that the human 'interface' is quite superior to the different Morse decoders is that the brain, when receiving Morse, can also filter out the required signal amidst a number of other Morse transmissions, often having a different pitch.
Samuel F. B. Morse Samuel Finley Breese Morse was born on April 27, 1791, in Charlestown, just outside of Boston, Massachusetts. He was the son of Jedidiah Morse, a pastor who was as well known for his geography as Noah Webster, a friend of the family, was known for his dictionaries. At Yale College, Morse was an indifferent student, but his interest was aroused by lectures of the then newly-developing subject of electricity, and he delighted in painting miniature portraits. After college, to the discomfort of his austere parents, Morse directed his enthusiasm especially to painting, which he studied in England. After settling in New York City in 1825, he became one of the most respected painters of his time, rendering character boldly.
Morse was warmly sociable, was at home with the cultivated and was ardent in conservative politics. A natural leader, he was a founder and the first president of the National Academy of Design, but was defeated in his campaigns to become mayor of New York or a Congressman. In 1832, while returning on the ship Sully from another period of art study in Europe, Morse heard a conversation about the newly discovered electromagnet and conceived of the idea of an electric telegraph. He mistakenly thought that the idea of such a telegraph was new, thus helping to give him the impetus to push the idea forward.
By 1835 he probably had his first telegraph model working in the New York University building where he taught art. Being poor, Morse used in his model such crude materials as an old artist's canvas stretcher to hold it, a home-made battery and an old clock- work to move the paper on which dots and dashes were to be recorded. In 1837 Morse acquired two partners to help him develop his telegraph. One was Leonard Gale, a quiet professor of science at New York University who advised him, for example, on how to increase voltage by increasing the number of turns around the electromagnet. The other was Alfred Vail, a morose young man who made available both his mechanical skills and his family's New Jersey iron works to help construct better telegraph models. With the aid of his new partners, Morse applied for a patent for his new telegraph in 1837, which he described as including a dot and dash code to represent numbers, a dictionary to turn the numbers into words and a set of saw tooth type for sending signals. Morse, discouraged with his art career, was giving nearly all his time to the telegraph.
By 1838, at an exhibition of his telegraph in New York, Morse transmitted ten words per minute. He had dispensed with his number-word dictionary, using instead the dot-dash code directly for letters. Though changes in detail were to be made later, the Morse code that was to become standard throughout the world had essentially come into being. During the next few years Morse exhibited his telegraph before savants, businessmen and committees of Congress, hoping to find the funds to give his telegraph a large-scale test. He met considerable scepticism that any message could really be sent from city to city over wire. On his own, in 1843, without significant help from his discouraged partners, Morse finally secured funds from Congress to construct the first telegraph line in the U. S. from Baltimore to Washington D.C. After Morse directed the wires to be set on poles instead, the work advanced well, and by May 1844, the first inter-city electromagnetic telegraph line in the world was ready. Then, from the Capitol building in Washington, Morse sent a Biblical quotation as the first formal message on the line to Baltimore, a message that revealed his own sense of wonder that God had chosen him to reveal the use of electricity to man: "What Hath God Wrought!" After twelve years in which most Americans had ignored his efforts to develop a telegraph, Morse had quickly become an American hero. By 1846 private companies, using Morse's patent, had built telegraph lines from Washington reaching to Boston and Buffalo, and were pushing further.
By 1847, with enough money from the telegraph, Morse was at last able to bring his scattered family together in an ample country home of his own. He bought a house with one hundred acres of land just outside of Poughkeepsie and named it Locust Grove. In 1848, Morse was married a second time to a poor cousin of only 26 years who was considerably deaf and dumb. Morse explained that he chose her in part because she would be dependent on him. Morse's family grew with several more children. In the early 1850's, Morse rebuilt the Locust Grove house in the then popular Italian villa style. In his later years, Morse, a patriarchal figure, attained recognition at home and abroad which is seldom accorded a living hero of the arts of peace. As a wealthy man, he was generous in giving funds to colleges, including Yale and Vassar, benevolent societies and to poor artists.
For his 80th birthday in 1871 a statue was unveiled in Central Park on June 10th, with two thousand telegraphers present. Morse was not, but was that evening at the Academy of Music for an emotional acclamation of his work. He died in New York City on April 2, 1872, at the age of 81.
Biography of Samuel F. B. Morse, adapted by Carleton Mabee from his book The American Leonardo, a Life of Samuel F. B. Morse
The telegraph - of course - came to be very important for the military, being used first at Varna during the Crimean War in 1854. It was widely used in the American Civil War, where rapid deployment techniques for land-lines were developed; the Spanish-American War found the first use of telegraphy for newspaper correspondents (1898). The first military use for radio telegraphy was during the Russian-Japanese War in 1904 - 1905. Telegraphers were, no doubt, a special elite; perhaps one of the first documented to suffer from repetitive strain injury. ‘Brass pounding’, that is telegraphy on a straight (up and down) key gave rise to telegrapher’s ‘glass arm’; it was this that motivated the invention of the ‘side-swiper’ or ‘bug’ key, the most famous maker which is Vibroplex.
Morse Code Alphabet
The International Morse code characters are:
End of message .-.-. (AR)
End of transmission ...-.- (SK)
Start of message -.-.- (KA)
There are lots of other Morse signals, such as:
There are also special signals used for characters in the Russian and Japanese language.
Morse code is perfect for someone with little or no ability to
move. A person just needs to be able to activate a switch.
http://www.makoa.org/jlubin/morsecode.htm Morse code is perfect for someone with little or no ability to move. A person just needs to be able to activate a switch.
http://freenet.msp.mn.us/people/calguire/morse.html International Morse Code Chart
http://www.teklasoft.com/java/applets/morse/mfiles.htm This applet reads individual sound (.au) files for each Morse code character. There are 43 sound files for a total size of about 262K bytes. As a result it may take a long time to load, so please be patient while the files are being loaded.
http://www.mtechnologies.com/keys.htm "Everything for the Morse enthusiast!"
Morse code Encoder/Decoder
Usage: Enter the text or Morse code into the corresponding (upper) box.
The correct translation should appear in real time in the box below. If not, click the button "transform". ATTENTION: Spaces between the words in mores code are symbolized with " & ".
The letters in Morse code are separated with normal spaces.