The document discusses radio waves as a type of electromagnetic radiation, detailing their characteristics, history, and specifications. It also covers various applications of radio waves, including communication methods used in mobile devices, Wi-Fi, and GPS technology. While highlighting the advantages such as wire-free communication, it also notes disadvantages including potential interference and limited data transmission capacity.

1. Radio Wave System
Prepared By:
Aamir Raza Khaskheli
BS (CS) Student
(Semester-4) Batch-2014
Department Of Computer Science.

2. Outline of Radio Waves System
• Radio Wave System
• History
• Characteristics
• Specifications
• Advantages and Disadvantages
• Define three Devices (Mobile Device, Wi-Fi Device, GPS Device etc.)

3. Radio Waves System
• Radio Waves are type of electromagnetic radiation, they have
wavelengths in the electromagnetic spectrum.
• Radio wave frequencies varies from 300 GMz to as small as 3 KHz.
• Radio wave travel at the speed of light.
• wave have different frequencies when in the earths atmosphere, long
wave lengths cover a part of the earth constantly and reflect off the
ionosphere and then travel around the world.
• Shorter wavelengths bend very little and travel on a line of a sight
meaning that if there are buildings etc. in the way then the signal
could be badly effected.

4. Frequency
Uses of Radio Waves:
• Radio-For both FM and AM
radio broadcasts,
• Television,
• Military communication,
• Mobile Phone,
• Wireless Computer networks.
Radio Waves System

5. History
James Clerk Maxwell
Radio waves were first predicted by mathematical work
done in 1867 by Scottish mathematical physicist James
Clerk Maxwell. Maxwell noticed wave like properties of
light and similarities in electrical and magnetic
observations. Maxwell described light waves and radio
waves as waves of electromagnetism that travel in
space, radiated by a charged particle as it undergoes
acceleration.
In 1887, Heinrich Hertz demonstrated the reality of
Maxwell's electromagnetic waves by experimentally
generating radio waves in his laboratory, showing that they
exhibited the same wave properties as light: standing
waves, refraction, diffraction, and polarization.
Heinrich Rudolf Hertz

6. History
Radio waves were first used for
communication in the mid 1890s by
Guglielmo Marconi, who developed the first
practical radio transmitters and receivers.
Guglielmo Marconi

7. • 1. Radio Wave's Directness
• As a frequency gets higher, the wave length gets shorter, and the
directness and refractiveness increase, It approaches the properties
of light.
• 2. Noise Occurrence
• When a radio wave is weak, (when the electric signal is small), noise
increases. For example, the further the distance between the base
unit and the portable unit (inverse proportion to distance squared),
the radio wave will become weaker and, at a certain level, the noise
(radio wave disturbance). There is also the possibility that the
cordless phone may receive interference when operated near a radio
or TV station, electric cable, etc.
Characteristics

8. 1. Communication Method
2 . Transmitter
• Rated Output
• Type and Frequency Range of Transmittable Radio Wave
• Oscillation
• Modulation
3. Manufacturer Information
• Name of Manufacturer
• Model Type or Name
• Serial Number
4. Antenna
• Type and Structure
• Gain
5 Classification and Model Type or Name of Auxiliary Equipment
6 Other Type Specifications Items
7 Attached Drawing
8 Reference Information
Technical Type Specification

9. Advantages
• An advantage is that this method of communicating does not require
wires to transmit information.
Disadvantages
• A disadvantage is that radio stations using similar transmission
frequencies sometimes interfere.
• One of the disadvantages of radio waves is that they cannot transmit
a lot of data simultaneously because they're low frequency.
Advantages and Disadvantages

10. • Mobile Network Device
• Mobile Network use a microwave from
of electromagnetic radiation.
• Your voice is transmitted as a sine wave
to transmitter.
• The signal is then sent to a mobile tower
which then towards the signal to another
mobile.
• The same process is used to receive the
voice back from the other end.
Define three Devices
(For example: Mobile Device, Wifi Device, Satellite
Navigation (GPS) Device etc.)

11. • Wireless network use a system similar
to a radio and mobile networks.
• It require a base station with an antenna
that transmits data that is translated
into a radio signal.
• The computer then receives this radio
transmission and converts the
radio wave back into data.
• it then requests more data back to the
base station which use a
physical connection (Ethernet) to find
the information on a remote server.
Wi-Fi Device

12. • Satellite Navigation uses a GPS (Global Positioning System)
to find the co-ordinate of your longitude
and latitude using the reference of three
separate Satellites.
• The navigation system then cross references
these co-ordinates with a onboard saved
map to demonstrate your location visually.
• It then uses a algorithm to find the best
route to a destination you set.
GPS Device