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.

Mix

Mix, mixes, mixture, or mixing may refer to:

In mathematics, science, and technology

In electronics and telecommunications

Other uses in mathematics, science, and technology

Marina

A marina (from Spanish [maˈɾina], Portuguese [maˈɾinɐ] and Italian [maˈriːna]: marina, "coast" or "shore") is a dock or basin with moorings and supplies for yachts and small boats. A marina differs from a port in that a marina does not handle large passenger ships or cargo from freighters.

The word marina is also used for inland wharves on rivers and canals that are used exclusively by non-industrial pleasure craft such as canal narrowboats.

Emplacement

Marinas may be located along the banks of rivers connecting to lakes or seas and may be inland. They are also located on coastal harbors (natural or man made) or coastal lagoons, either as stand alone facilities or within a port complex.

Facilities and services

A marina may have refueling, washing and repair facilities, marine and boat chandlers, stores and restaurants. A marina may include ground facilities such as parking lots for vehicles and boat trailers. Slipways (or boat ramps) transfer a trailered boat into the water. A marina may have a boat hoist well (a traveling crane) operated by service personnel. A marina may provide in- or out-of-water boat storage.