Tripoli

Tripoli (Arabic: طرابلس‎, Ṭarābulus; Berber: Ṭrables) is the de jure capital city and the largest city of Libya. Tripoli, with its metropolitan area, has a population of about 3,200,000 million people. The city is located in the northwestern part of Libya on the edge of the desert, on a point of rocky land projecting into the Mediterranean and forming a bay.

Tripoli includes the Port of Tripoli and the country's largest commercial and manufacturing centre. It is also the site of the University of Tripoli. The vast Bab al-Azizia barracks, which includes the former family estate of Muammar Gaddafi, is also located in the city. Colonel Gaddafi largely ruled the country from his residence in this barracks.

Tripoli was founded in the 7th century BC by the Phoenicians, who named it Oea. Due to the city's long history, there are many sites of archaeological significance in Tripoli. "Tripoli" may also refer to the shabiyah (top-level administrative division in the current Libyan system), the Tripoli District.

Radio

Radio is the use of radio waves is to carry information, such as sound, by systematically modulating some property of electromagnetic energy waves transmitted through space, such as their amplitude, frequency, phase, or pulse width. When radio waves strike an electrical conductor, the oscillating fields induce an alternating current in the conductor. The information in the waves can be extracted and transformed back into its original form.

Radio systems need a transmitter to modulate (change) some property of the energy produced to impress a signal on it, for example using amplitude modulation or angle modulation (which can be frequency modulation or phase modulation). Radio systems also need an antenna to convert electric currents into radio waves, and vice versa. An antenna can be used for both transmitting and receiving. The electrical resonance of tuned circuits in radios allow individual stations to be selected. The electromagnetic wave is intercepted by a tuned receiving antenna. A radio receiver receives its input from an antenna and converts it into a form usable for the consumer, such as sound, pictures, digital data, measurement values, navigational positions, etc. Radio frequencies occupy the range from a 3 kHz to 300 GHz, although commercially important uses of radio use only a small part of this spectrum.

Libya

Libya (Arabic: ليبيا‎ Lībiyā) is a country in the Maghreb region of North Africa bordered by the Mediterranean Sea to the north, Egypt to the east, Sudan to the southeast, Chad and Niger to the south, and Algeria and Tunisia to the west. The three traditional parts of the country are Tripolitania, Fezzan and Cyrenaica. With an area of almost 1.8 million square kilometres (700,000 sq mi), Libya is the fourth largest country in Africa, and is the 16th largest country in the world. Libya has the 10th-largest proven oil reserves of any country in the world.

The largest city and capital, Tripoli, is located in western Libya and contains over one million of Libya's six million people. The other large city is Benghazi, which is located in eastern Libya.

Libya has been inhabited by Berbers since the late Bronze Age. The Phoenicians established trading posts in western Libya, and Ancient Greek colonists established city-states in eastern Libya. Libya was variously ruled by Persians, Egyptians and Greeks before becoming a part of the Roman Empire. Libya was an early center of Christianity. After the fall of the Western Roman Empire, the area of Libya was mostly occupied by the Vandals until the 7th century, when invasions brought Islam and Arab colonization. In the sixteenth century, the Spanish Empire and the Knights of St John occupied Tripoli, until Ottoman rule began in 1551. Libya was involved in the Barbary Wars of the 18th and 19th centuries. Ottoman rule continued until the Italian occupation of Libya resulted in the temporary Italian Libya colony from 1911 to 1943. During the Second World War Libya was an important area of warfare in the North African Campaign. The Italian population then went into decline. Libya became an independent kingdom in 1951.