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 Morse Code - SOS

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PostSubject: Morse Code - SOS   Tue 28 Feb 2012 - 21:23

This will help you translate words or sentences into Morse code, you
will be able to see how it’s written, and also hear how it sounds. But
before that let’s learn more about this SOS code. Morse code is a method
for transmitting telegraphic information, using standardized sequences
of short and long elements to represent the letters, numerals,
punctuation and special characters of a message. The short and long
elements can be formed by sounds, marks or pulses, in on off keying and
are commonly known as "dots" and "dashes" or "dits" and "dahs". If you
need a list of the alphabet in Morse code please click on the image to
the left.

What does SOS Stand For?

SOS actually did not stand for anything, orginally; "Save Our
Seamen", "Save our Ship", "Survivors On Shore", "Save Our Souls" or
"Save Our Selves" are just ways to guess the meaning. But in reality, it
was used because the letter S and O are easy to make and are
distinctive. The letter S has a distinctive 3 dots (...) and the letter O
has a distinctive 3 dashes (---). Click on the image above for a list
of the rest of the Alphabet in Morse Code.

International Morse code is composed of six elements:

short mark, dot or 'dit' (·)

longer mark, dash or 'dah' (-)

intra-character gap (between the dots and dashes within a character)

short gap (between letters)

medium gap (between words)

long gap (between sentences — about seven units of time)

These six elements serve as the basis for International Morse code and
therefore can be applied to the use of Morse code world-wide.

Morse code can be transmitted in a number of ways: originally as
electrical pulses along a telegraph wire, but also as an audio tone, as a
radio signal with short and long pulses or tones, or as a mechanical or
visual signal (e.g. a flashing light) using devices like an Aldis lamp
or a heliograph. Morse code is transmitted using just two states — on
and off — so it was an early form of a digital code. However, it is
technically not binary, as the pause lengths are required to decode the

Originally created for Samuel F. B. Morse's electric telegraph in the
early 1840s, Morse code was also extensively used for early radio
communication beginning in the 1890s. For the first half of the
twentieth century, the majority of high-speed international
communication was conducted in Morse code, using telegraph lines,
undersea cables, and radio circuits. However, the variable length of the
Morse characters made it hard to adapt to automated circuits, so for
most electronic communication it has been replaced by more machinable
formats, such as Baudot code and ASCII.

The most popular current use of Morse code is by amateur radio
operators. Although no longer a requirement for Amateur licensing in
most countries, it also continues to be used for specialized purposes,
including identification of navigational radio beacon and land mobile
transmitters, plus some military communication, including flashing-light
semaphore communications between ships in some naval services. Morse
code is the only digital modulation mode designed to be easily read by
humans without a computer, making it appropriate for sending automated
digital data in voice channels, as well as making it ideal for emergency
signaling, such as by way of improvised energy sources that can be
easily "keyed" such as by supplying and removing electric power (e.g. by
switching a breaker on and off).
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