Radio Waves SMAKBO
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Transcript of Radio Waves SMAKBO
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 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.
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/