Radio Waves

Physics Presentation | Group 1 | Class 11-6 | SMK-SMAK Bogor

Sarah Maulina

Siti Safira Nur

Syiva Nooraini

Wihda Nooraini

Yudhistira Bayu Pratama

RADIO WAVES

Radio wave is form when electricity object from the carrier wave has the combination of electric field and magnetic field that vibrated and propagated through the space and bring

the energy (electromagnetic radiation)and the electricity object modulated with the audio

wave in the frequency radio wave at the spectrum electromagnetic.

Frequency and

wavelength

Frequency (Hz)104 – 108

Wavelength (m)10-2 - 103

FREQUENCY LENGTH SPESIFIC WAVELENGTH APPLICATIONS

Low ( LF )30-300 kHz

Long Wave1.500 m

Long wave radio and longdistance communication

Medium ( MF )300 kHz-3MHz

Medium Wave300 m

AM Radio

High ( HF )3 MHz-30 MHz

Short Wave30 m

Short wave radio andcommunication, amateur

radio

Very High ( VHF )30-300 MHz

Very Short Wave3 m

FM Radio, police, andemergency service

Ultra High ( UHF)300 MHz-3 GHz

Ultra Short Wave30 cm

Television

Super High (SHF)> 3 GHz

Microwave3 cm

Radar, satellitecommunication, telephone,

and TV channel

Classification of Radio Waves

Microphone converts sound waves into electrical signal

This signal is combined with the other signals which is quickly vibrating

This combined signals are converted into radio waves and then emitted

through antenna

Spread through the air and captured by the receiver

Tuner circuit filter the radio waves

Electrical signal is converted into sound waves

HOW RADIO WAVES ARE PRODUCED

Naturally occurring radio waves are made by lightning, or by astronomical objects. Artificially generated radio waves are used for fixed and mobile radio communication, broadcasting, radar

and other navigation systems, communications satellites, computer networks and innumerable other applications.

Amplitude Modulation Reflected by the ionosphere so it has a wide range. Frequency (300 kHz – 3 MHz) and the Wavelength is 300 m. The one who modulated is the amplitude.

Frequency ModulationNot reflected by the ionosphere so it has a narrow range. Frequency (30 –300 MHz) and the Wavelength is 3 m. the one who modulated is frequency.

James Clerk Maxwell1831 - 1879

FOUNDER OF

David E. Hughes

FOUNDER OF

Heinrich Rudolf Hertz1857-1894

FOUNDER OF

Edward Howard Armstrong1890-1954

FOUNDER OF

Applications

1. FM Radio

2. AM Radio

3. Handy Talky

4. Radar

5. Telephone

6. Television

7. Satellite

Satellite

A satellite works by receiving

radio signals sent from the Earth

and resending the radio signals

back down to the Earth. In a

simple system, a signal is

reflected, or "bounced," off the

satellite. For example, it is

possible to bounce a signal off

the surface of the Moon back

down to Earth.

Radio waves are electromagnetic waves which one has the longest wavelength and the lowest frequency. It’s formed

when electrically charged object of wave oscillator (carrier wave) modulated by

the audio waves with a lower frequency of the radio signal. Usually used in

communications.

Source• http://www.ekoratnoprihantoroindonesia.blogspot.com/2009/

06/perbedaan-gelombang-fm-dan-am.html

• http://aisyahipalima.blogspot.com/2011/08/tugas-fisika-gelombang-elektromagnetik.html

• http://kelompokkami.wordpress.com/handy-talky/

• http://www.darvill.clara.net/emag/emagradio.htm

• http://www.agusbaha07.blogspot.com/2012/10/sejarahpenemu-dan-perkembangan-radio.html

• http://en.wikipedia.org/wiki/Electromagnetic_spectrum

• http://jadiberita.com/42710/siapakah-sebenarnya-penemu-radio/

• http://wawan.guru.sman1-slo.sch.id/2012/09/05/gelombang-radio/