Sussex

Sussex (/ˈsʌsᵻks/; abbreviated Sx), from the Old English Sūþsēaxe ('South Saxons'), is a historic county in South East England corresponding roughly in area to the ancient Kingdom of Sussex. Clockwise, it is bounded to the west by Hampshire; north by Surrey, north-east by Kent, south by the English Channel and is divided for local government into West Sussex and East Sussex and the city of Brighton and Hove. Brighton and Hove was created as a unitary authority in 1997, and was granted City status in 2000. Until then, Chichester had been Sussex's only city.

Sussex has three main geographic sub-regions, each oriented approximately east to west. In the south-west of the county lies the fertile and densely populated coastal plain. North of this lie the rolling chalk hills of the South Downs, beyond which lies the well-wooded Sussex Weald.

The name 'Sussex' derives from the Kingdom of Sussex, according to legend it was founded by Ælle of Sussex in 477 AD, then in 825 it was absorbed into the kingdom of Wessex and the later kingdom of England. The region's roots go back further to the location of some of Europe's earliest hominid finds at Boxgrove. Sussex has been a key location for England's major invasions, including the Roman invasion of Britain and the Battle of Hastings.

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.