radio waves from SMAKBO 59

1. Radio Waves
Physics Presentation | Group 1 | Class 11-6 | SMK-SMAK Bogor
Sarah Maulina
Siti Safira Nur
Syiva Nooraini
Wihda Nooraini
Yudhistira Bayu Pratama

2. 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.

3. Frequency and
wavelength
Frequency (Hz)
104 – 108
Wavelength (m)
10-2 - 103

4. FREQUENCY LENGTH SPESIFIC WAVELENGTH APPLICATIONS
Low ( LF )
30-300 kHz
Long Wave
1.500 m
Long wave radio and long
distance communication
Medium ( MF )
300 kHz-3MHz
Medium Wave
300 m
AM Radio
High ( HF )
3 MHz-30 MHz
Short Wave
30 m
Short wave radio and
communication, amateur
radio
Very High ( VHF )
30-300 MHz
Very Short Wave
3 m
FM Radio, police, and
emergency service
Ultra High ( UHF)
300 MHz-3 GHz
Ultra Short Wave
30 cm
Television
Super High (SHF)
> 3 GHz
Microwave
3 cm
Radar, satellite
communication, telephone,
and TV channel
Classification of Radio Waves

6. 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

7. 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.

8.  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 Modulation
Not 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.

9. James Clerk Maxwell
1831 - 1879
FOUNDER OF

10. David E. Hughes
FOUNDER OF

11. Heinrich Rudolf Hertz
1857-1894
FOUNDER OF

12. Edward Howard Armstrong
1890-1954
FOUNDER OF

13. Applications
1. FM Radio
2. AM Radio
3. Handy Talky
4. Radar
5. Telephone
6. Television
7. Satellite

14. 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.

15. 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.

16. 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/sejarahpenem
u-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/