Information on radio

2.  Nikola Tesla invented the fundamentals
for the radio transmission
 a wireless telephonic device that
operated electromagnetically at audio
frequencies


3.  Radios have been one of the more
important technological devices for
more than a century. From their
beginnings in the early 1800’s until the
new developments in recent
years, radios have helped to provide
communication as well as entertainment
throughout the society of many cultures.

5.  The early years of the radio technology began
early in the 1800s, but the actual invention
cannot be attributed to only one person. During
this time period, several inventors created and
improved upon the technology that became the
radio as we know it today. Once referred to as
“wireless telegraphy,” radio technology has
always included electronic signaling between a
transmitter and one or more receivers. In order to
accomplish this, there are many several pieces
of technology that fit together.

6.  Radio waves (or radio frequency - RF) are an
invisible yet essential part of our modern life.
Radio waves were discovered more than 100
years ago and we often take today's
technology for granted. Scientists have been
studying the health effects of radio waves for
more than 50 years.
 Radio waves are part of the electromagnetic
spectrum which also includes light and heat
and is used by all electrical equipment
including television and radio stations as well as
mobile phones.

7.  Radio broadcast technology and
radio broadcasting including
analogue radio digital
radio, analogue television and
the many forms of digital
television for terrestrial
television, satellite television and
mobile or handheld television

8.  Sound consists of pressure variations in
matter, such as air or water. Sound will not
travel through a vacuum. Radio waves, like
visible light, infrared, ultraviolet, X-rays and
gamma rays, are electromagnetic waves that
do travel through a vacuum When you turn on
a radio you hear sounds because the
transmitter at the radio station has converted
the sound waves into electromagnetic
waves, which are then encoded onto an
electromagnetic wave in the radio frequency
range (generally in the range of 500-1600 kHz
for AM stations, or 86-107 MHz for FM stations)

9. The end