Saturday, 15 January 2011

Phonetics and Morse Codes

Phonetics is a branch of linguistics that comprises the study of the sounds of human speech. In HAM, it is known as language of Radio communication.

Morse code is a method of transmitting textual 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. The International Morse Code encodes the Roman alphabet, the Arabic numerals and a small set of punctuation and procedural signals as standardized sequences of short and long "dots" (.)and "dashes"(-), or "di" (डि) and "da" (डा). Because many non-English natural languages use more than the 26 Roman letters, extensions to the Morse alphabet exist for those languages. When 'dot' comes to end of any character, it will be pronounced as 'dit' i.e. 'I' is represented as ".." in morse code and pronounced as 'di dit' (डि डिट्).
Morse code speed is specified in words per minute (WPM) and associated with an "element time" equal to 1.2 seconds divided by the speed in WPM.


For Number Phonetics will be as follows :

0 - Nada
1 - Una
2 - Bisso
3 - Terra
4 - Karte
5 - Panta
6 - Soxy
7 - Sette
8 - Okto
9 - Nova
Dot (.) - Decimal/Stop

Now its very difficult to memorise the morse code. Am I right? Lets make it easy. Please see the below image which will help us to remember the morse code.



You will find the Morse code translator in below URL. Check it out & have a fun.

http://morsecode.scphillips.com/translator.html

WHAT IS ELECTRICITY?

Electricity is a form of energy. Electricity is the flow of electrons. All matter is made up of atoms, and an atom has a center, called a nucleus. The nucleus contains positively charged particles called protons and uncharged particles called neutrons. The nucleus of an atom is surrounded by negatively charged particles called electrons. The negative charge of an electron is equal to the positive charge of a proton, and the number of electrons in an atom is usually equal to the number of protons. When the balancing force between protons and electrons is upset by an outside force, an atom may gain or lose an electron. When electrons are "lost" from an atom, the free movement of these electrons constitutes an electric current.

Voltage, V

Voltage is a measure of the energy carried by the charge. Strictly: voltage is the "energy per unit charge".
The proper name for voltage is potential difference or p.d. for short, but this term is rarely used in electronics.
Voltage is supplied by the battery (or power supply).
Voltage is used up in components, but not in wires.
We say voltage across a component.
Voltage is measured in volts, V.
Voltage is measured with a voltmeter, connected in parallel.
The symbol V is used for voltage in equations.


Current, I

Current is the rate of flow of charge.
Current is not used up, what flows into a component must flow out.
We say current through a component.
Current is measured in amps (amperes), A.
Current is measured with an ammeter, connected in series. To connect in series you must break the circuit and put the ammeter acoss the gap, as shown in the diagram.
The symbol I is used for current in equations.
1A (1 amp) is quite a large current for electronics, so mA (milliamps) are often used. m (milli) means "thousandth":
1mA = 0.001A, or 1000mA = 1A