4. One of the electromagnetic wave. (doesn’t need
medium to propogate)
The largest wave length 1 – 1000 meters
The smallest frequency ranged between 104 until
107 hertz.
The radio wave is mostly used in daily life such as in
telecommunication. The examples are handphone,
television and radio.
5.
6.
7. Radio waves created from electric charge that
accelerated through the conductor wires. This
charges generated by the electronic circuit
called an oscillator.
8. According To The Frequency
According To Wavelength
According To Modulation System
9. FREQUENCY LENGTH Specific Wavelength Applications
Low (LF)
30 kHz – 300 kHz
Long Wave
1500 m
Long wave radio and long
distance communication
Medium (MF)
300 kHz – 3 mHz
Medium Wave
300 m
Local medium wave and long
distance radio
High (HF)
3 mHz – 30 mHz
Short Wave
30 m
Short wave radio and
communication, amateur radio
and CB
Very High (VHF)
30 mHz – 300 mHz
Very Short Wave
3m
FM Radio, police, and emergency
service
Ultrahigh (UHF)
300 mHz – 3 GHz
Ultra Short Wave
30 cm
TV (line 4, 5)
Super High (SHF)
> 3 GHz
Microwave
3 cm
Radar, satellite communication,
telephone, and TV channel
10. According To Wavelength
Long wavelength (1500 M)
Medium Wave (300 M)
Short wave (30 M)
Very short Waves (3 M)
Ultra short Wave (30 Cm)
The microwave (3 Cm)
11.
12. Amplitude Modulation (AM)
An information carrier have
a big frequency ,the range is
between 550 kHz until 1.600
kHz
Can be reflected by the
Ionosphere that caused AM
has a high reach and used for
communication over long
distances.
But AM is not clear because
influenced by weather.
The Frequency Modulation
(FM)
The frequency ranged is
about 88 kHz until 108 kHz.
Can not be reflected by the
Ionosphere that caused FM
has a narrow range.
But FM is clear because not
influence by the
atmosphere (ionosphere).
13. The Inventor
The basic theory of the propagation of
electromagnetic waves was first described by
him, in his paper reporting on the Royal
Society on A dynamical theory of the
electromagnetic field, based on the results of
his research work between 1861 and 1865.
He was the first person that transmit and
receive radio waves when he found that the
balance of induction caused interference to
the phone line. He demonstrated his
discovery to the Royal Society in 1880 but
just say that's just an induction.
14. He was the first to prove the theory of
Maxwell through experiments,
demonstrated that radio radiation had all
the properties of waves (now called
Hertzian waves), and discovered that the
electromagnetic equations could be
formulated into the equation partial
derivatives called the wave equation.
s = distance of objects that captured radar
c = 3 x 108 m/s
Δt = Differences of temperature
The Inventor
17. The Sample of Problem
1. What the differences between AM and FM?
2. Mention the radiowave based on the wave
length!
3. Explain the process about radio! (How people
can heard the presenter‘s voice)
4. What the relationship between wavelength and
frequency?
5. Why FM clearest than AM?
18. Conclusion
• Radio wave is one of the electromagnetic wave.
• If the wavelength high, the frequency is low.
• If the wavelength low, the frequency is high.
• The radio wave the largest wave length 1 – 1000 meters and
the smallest frequency ranged between 104 until 107 hertz.
• FM is clearest than AM because FM can’t be reflected by
ionosphere so not influenced by atmosphere.
• Process of Radio is A->Z (sending process) then Z->A
(receiving process)
