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If you are embarking on quite a lot of night-based adventures in populated waters, then you are almost mad not to have one of these tricky little fellas on board. Raymarines hand-held range of thermal night vision scopes will not only help to protect yourself, your passengers and your vessel, but also anyone else out on the water. With basic, easy

The key benefits for listeners are improved sound quality and greater choice due to the increase in the number of digital services. Some digital radio receivers can also provide pause and rewind functions and on-screen information. Screens can convey programming information such as artist and track titles, program schedules and information concerni

The term "radio" is derived from the Latin word "radius", meaning "spoke of a wheel, beam of light, ray". It was first applied to communications in 1881 when, at the suggestion of French scientist Ernest Mercadier, Alexander Graham Bell adopted "radiophone" (meaning "radiated sound") as an alternate name for his photophone optical transmission syst

In 1966, Gordon McLendon bought KGLA(FM), Los Angeles and changed the calls to KADS(FM), running only commercials: local ads, commercials and national commercials.. It was targeted to grab business from the newspapers. The want ads were either their own voices into a telephone recording device or they could use professional announcers.

Electricity flowing into the transmitter antenna makes electrons vibrate up and down it, producing radio waves. 2) The radio waves travel through the air at the speed of light. 3) When the waves arrive at the receiver antenna, they make electrons vibrate inside it.

A radiotelescope is basically a very sensitive radio receiver. Whereas communications receivers are designed to extract information which has been intentionally modulated onto a radio wave, radiotelescope receivers are designed to measure the intensity of the radio wave over some band of frequencies. A radiotelescope is essentially an energy measur