top of page

Morse Code

What is it?

  • Morse code is a method of transmitting text information as a series of on-off tones, lights, or clicks that can be directly understood by a skilled listener or observer without special equipment.

  • It is named for Samuel F. B. Morse, an inventor of the telegraph.

  • The code assigned letters in the alphabet and numbers a set of dots (short marks) and dashes (long marks) based on the frequency of use.

  • Morse code sequence may be made from a combination of the following five-bit strings:

  1. short mark, dot or "dit" (  ): 1

  2. longer mark, dash or "dah" (     ): 111

  3. intra-character gap (between the dots and dashes within a character): 0

  4. short gap (between letters): 000

  5. medium gap (between words): 0000000

-

  • Chart of the Morse code letters and numerals.

  • Each Morse code symbol represents either a text character.

  • The letters of a word are separated by a space equal to three dots, and the words are separated by a space equal to seven dots.

-

  • The length of a dot is one unit.

  • A dash is three units.

  • The space between parts of the same letter is one unit.

  • The space between letters is three units.

  • The space between words is seven units.

  • Printed morse code:

  • Morse code in the electrical signal:

  • Morse code generating instrument with beep:

How does it work?

If the time of contact of T is more, it is called a DASH ( __ ).

If it is very short, it is called DOT ( . )

K

  • When the Morse Key K is pressed, the circuit is completed through the ground which is a conductor.

  • The electromagnet attracts the armature A and it produces a sound 'click' on striking the rod K2.

  • On releasing the Morse key K, the circuit breaks and the armature goes to its original position touching the rod Kl.

Telegraph & Morse Code

  • The Telegraph is the first long-distance communication.

  • To transmit messages across telegraph wires, in the 1830s Morse and Vail created what came to be known as Morse code.

  • Initially, the code, when transmitted over the telegraph system, was rendered as marks on a piece of paper that the telegraph operator would then translate back into English.

  • the paper was replaced by a receiver that created more pronounced beeping sounds.

Telegraph is the first modern instrument used in sending messages to a distant place in a very short time.

Receiver (B)

Transmitter(A)

With the help of the message is transmitted at A and decoded at the station B to receive the message.

  • In 1844, Morse sent Vail the first ever telegraph message.

  • In 1874, Thomas Alva Edison developed which allowed for four messages to be transmitted simultaneously using the same wire.

  • Use of the telegraph was quickly accepted by people eager for a faster and easier way of sending and receiving information.

  • 40 such telegraph lines across the Atlantic by 1940.

Lighthouse & Morse Code

  • Morse code can be transmitted in a number of ways:

  • electrical pulses along a telegraph wire

  • audio tone

  • radio signal with short and long tones

  • mechanical or visual signal (e.g. a flashing light)

  • But for you, we shall Decode and Read.

  • We can communicate to the lighthouse, ship with this technique.

Morse code through flashing light.

Aldis lamp

Heliograph

  • Each time light flashes means DOT (.).

  • Each time light long puls mean DASH(-).

Use

  • Morse code is used by some amateur radio operator.

  • Aviation: Pilots and air traffic controllers usually need only.

bottom of page