MORSE CODE
Morse code was invented by Sir Samuel Morse in late 19th Centuary. It consists
of series of Dits and Dashes for each alphabet, number and punctuation marks.
For the ASOC examination this is a must for Grade I, Grade II and Advanced grade and
Restricted grade is exempted from morse code. Untill the advent of modern day communication
system the Morse code was used for telegram, and now also in many places Morse code is used for
telegrams. The advantage of Morse code compared to voice is that when the atmospheric condtions
deteriorate and voice cannot be effectively reach the destination due to noise. Whereas morse code
which is just audio switch ON and OFF can be easily identified. The below gives the Morse code chart.
Categorically divided into Alphabets, Numbers and Punctuation marks. Morse Code can be
generated using a simple Audio Oscillator using IC 555 timer or a Buzzer, battery and a switch as
morse key as shown in the figure.
ALPHABETS
A . - di-dah
B - . . . dah-di-di-dit
C - . - . dah-di-dah-dit
D - . . dah-di-dit
E . dit
F . . - . di-di-dah-dit
G - - . dah-dah-dit
H . . . . di-di-di-dit
I . . di-dit
J . - - - di-dah-dah-dah
K - . - dah-di-dah
L . - . . di-dah-di-dit
M - - dah-dah
N - . dah-dit
O - - - dah-dah-dah
P . - - . di-dah-dah-dit
Q - - . - dah-dah-di-dah
R . - . di-dah-dit
S . . . di-di-dit
T - dah
U . . - di-di-dah
V . . . - di-di-di-dah
W . - - di-dah-dah
X - . . - dah-di-di-dah
Y - . - - dah-di-dah-dah
Z - - . . dah-dah-di-dit
NUMBERS
0 - - - - - dah-dah-dah-dah-dah
1 . - - - - di-dah-dah-dah-dah
2 . . - - - di-di-dah-dah-dah
3 . . . - - di-di-di-dah-dah
4 . . . . - di-di-di-di-dah
5 . . . . . di-di-di-di-dit
6 - . . . . dah-di-di-di-dit
7 - - . . . dah-dah-di-di-dit
8 - - - . . dah-dah-dah-di-dit
9 - - - - . dah-dah-dah-dah-dit
PUNCTUATION MARKS
Full stop . - . - . - di-dah-di-dah-di-dah
Comma - - . . - - dah-dah-di-di-dah-dah
Semi-colon - . - . - . dah-di-dah-di-dah-dit
Hyphen - . . . . - dah-di-di-di-di-dah
Question Mark . . - - . . di-di-dah-dah-di-dit
Invitation to Transmit - . - . dah-di-dah
Wait . - . . . di-dah-di-di-dit
End of Message . - . - . dah-di-dah-di-dah-dit
End of Work . . . - . - di-di-di-dah-di-dah
Error . . . . . . . . di-di-di-di-di-di-di-dit
Received message . - . di-dah-dit
Separation - . . . - dah-di-di-di-dah
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