Radio Wave System Prepared By:

Aamir Raza KhaskheliBS (CS) Student

(Semester-4) Batch-2014

Department Of Computer Science.

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.)

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.

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

Radio Waves System

HistoryJames 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

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

Guglielmo Marconi

• 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

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

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

• Mobile Network Device

• Mobile Network use a microwave from of electromagnetic radiation.

• Your voice is transmitted as a sine waveto 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.)

• 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

• 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

Thank You

aamri.kh_4@live.com