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Radio waves/ Gelombang Radio SMAKBO 57 2013
Radio waves are electromagnetic waves that can travel through vacuum or other mediums. They have frequencies between 30 kHz to 300 GHz and wavelengths from 1-1000 meters. Radio waves are used for radio, television, phones and other communication technologies because they can travel long distances by reflecting off the ionosphere. They are generated by electric charges accelerated through conductor wires using an oscillator circuit. Common types are AM, FM, and newer digital radio technologies. Radio waves are essential for wireless information transmission.
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Radio waves/ Gelombang Radio SMAKBO 57 2013
- 1. Radio Waves Group 1: -Galang Adi S -M. Suhud Farabi -Nur Azizah - Rica Aditya
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- 3. Properties of Electromagnetic Waves Electromagnetic waves is waves that can vine Electromagnetic waves can vine in vacuum mediation. even there’s no medium or area/without any medium A transverse wave Didn’t have any electric charge so move straight in magnetic field and electric field Can undergo reflection, refraction, fusion, deflection, polarization The change of electric and magnetic field happen in the same time, so the electric and magnetic field will be on the same phase and proportional
- 5. Because the lengthof the waves ranged between 1 – 1000 meters and the frequency ranged between 104 until 107 hertz.
- 6. Radio waves isa waves that have frequency ranged between 104 until 107 hertz and the So…. length of the waves ranged between 1 – 1000 meters. This waves function is as “courier” in information technology. “Courier” means a waves properties that can be reflected with earth ionosfer , so it can reach some places with a long distance on earth and can be captured by the radio, television, handphone and etc.
- 7. Radio waves createdfrom electric charge that accelerated through the conductor wires. This charges generated by the electronic circuit called an oscillator.
- 8. James Clerk Maxwell David E. Hughes 1873 1878
- 9. Edwin Howard Heinrich RudolfHertz Amstrong 1886/1888 1890-1954
- 10. Radio waves thatcan be captured can be a sound, which is: AM (Amplitude Modulation) Amplitude modulation waves as an information carrier have a big frequency , ranged between 550 kHz until 1.600 kHz
- 11. Radio waves thatcan be captured can be a sound, which is: FM (Frequency Modulation) Use frequency wave modulation as an information carrier. The frequency ranged is about 88 kHz until 108 kHz. But, from those waves, the waves that AM showed is tend to be noisy that FM, because the existance of electrical events in the air that can disturb the amplitude. In far-reaching FM is worse because can’t be reflected through the ionosphere layer.
- 12. FREQUENCY LENGTH Specific Wavelength Applications Low (LF) Long Wave Long wave radio and long 30 kHz – 300 kHz 1500 m distance communication Medium (MF) Medium Wave Local medium wave and 300 kHz – 3 mHz 300 m long distance radio High (HF) Short Wave Short wave radio and 3 mHz – 30 mHz 30 m communication, amateur radio and CB Very High (VHF) Very Short Wave FM Radio, police, and 30 mHz – 300 mHz 3m emergency service Ultrahigh (UHF) Ultra Short Wave TV (line 4, 5) 300 mHz – 3 GHz 30 cm Super High (SHF) Microwave Radar, satellite > 3 GHz 3 cm communication, telephone, and TV channel
- 13. NOTE! 1. VHF andUHF This kind of wave can’t be reflected by Emission of FM wave layer in broadcasting atmosphere used because with VHFis narrow. excellence is free from its scope wave. It’s 2.electric interferention, so the music sounds AM and FM Emission of AM wave used in broadcasting with melodious. long wave and can be reflected by the ionosphere layer
- 14. 3. Medium Wave Radio wave with 1 MHz (1.000.000 Hz) is easy to reflected by the ionosphere layer
- 15. 4. Micro Wave Radio wave with highest frequency is up to 3 GHz. If food adsorb the radiation of the micro wave, the food will be hot in short time. Microwave also used in RADAR. RADAR means search and determined trace something with microwave
- 16. s = distanceof objects that captured radar λ c = 3 x 108 m/s λ
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- 20. Radio Radio wave hasthe longest wave length in electromagnetic spectrum. This wave can be longer than soccer field or as short as a ball. Radio wave do than just bring music to our radio. They carry signal for television and handphone too.
- 22. Hand phone An cellularphones also use radio waves to transmit information. This wave is much smaller that the TV and FM radio waves.
- 23. How does Radioworks?
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