Demo - Outdoorsy

Radio

Radio is a technology that used to sent signal with modulation (process depositing signals at carrier signal in last side from radiator tools) and electromagnetic radiation (electromagnetic waves).

This wave creep in a way weather and can creep in a way outer space, because the waves don’t need a transport media.

When radio wave creeping pass through cable, osilation from magnet field and magnet as mentioned above finding in AC current and voltage in the cable.

This thing could changed become audio signal or the other that brought information. Radio wave can creep with celerity 300.000 km/second.

Radio wave is different with audio waves. Radio wave creeping at frequency between 100.000 Hz until 100.000.000.000 Hz, whereas audio wave at frequency between 20 HZ until 20.000 Hz.

Radio Waves

§ Radio wave is one type from electromagnetic radiation and made during object electricity charged in modulation at frequency contained in radio waves frequency. Its electromagnetic radiation moved in a way magnetic.

§ Other electromagnetic waves that have frequency above radio waves such as gamma ray, X-ray, infrared, ultraviolet and light.

§ There is 2 wave transmission method of audio wave, that is Amplitudo Modulation (AM) and Frequency Modulation (FM).

§ The Dissimilarity from radio wave is range capacity is so far than infrared.

§ With high frequency, quality of sound that result more high too.

§ Long waves of radio waves is 10-100 meters.

§ Long waves of televition is 3-5 meters.

When the key in the circuit shown below is operated, radio waves are transmitted from the plate above the induction coil. If a radio receiver is turned on nearby, the radio waves enter its electrical circuit and are changed back into sound waves. Radio code messages can be sent short distance in this way.

Radio and television system differ from code system in much the same way that a telephone differs from a telegraph. Electronic devices in radio sending stations changes the sound into radio waves, which travel through the air at nearly the speed of light. In the receivers, these waves are changed back into sound by other electronic devices. Television picture are sent and received in similar way.