Basic radio communication

American International University -Bangladesh
Hossain Md Sazzat
13-24552-2

1. American International University-Bangladesh Welcome To E-Shop Presentation

2. Basic Radio Communication Technology and Appliances Presented By Hossain Md Sazzat 13-24552-2 BSc. I n EEE Faculty: A.H.M Shatil

3. Introduction 1 .Radio is the radiation of electromagnetic signals through the atmosphere or free space. 2. The transmission and reception of electromagnetic waves of radio frequency, especially those carrying sound messages.

4. Brief History Early radio testing scenario from AT & T Lab

5. History ** In 1873 James Clerk Maxwell showed mathematically that electromagnetic waves could propagate through free space. ** The first intentional transmission of a signal by means of electromagnetic waves was performed in an experiment by David Edward Hughes around 1880 . ** In 1888 Heinrich Rudolf Hertz was able to prove transmitted electromagnetic waves in an experiment confirming Maxwell's theory of electromagnetism.

6. History ** Nikola Tesla experimentally demonstrated the transmission and radiation of radio frequency energy in 1892 . ** 1895 , Marconi built a wireless system capable of transmitting signals at long distances (1.5 mi. / 2.4 km). ** From Marconi's experiments, the phenomenon that transmission range is proportional to the square of antenna height is known as "Marconi's law".

7. Classification of radio waves Class 1 . Very Low Frequency 2.Low frequency 3. Medium frequency 4.High frequency 5.Very high frequency 6.Ultra high frequency 7.Super high frequency Frequency Range 10 to 30 kHz 30 to 300 kHz 300 to 3000 kHz 3 to 30 MHz 30 to 300 MHz 300 to 3000 MHz 3000 to 30000 MHz

8. Mechanism

9. A  transducer  is a device that  converts one form of energy to another

10. Modulation Amplitude Modulation

11. Frequency Modulation

12. Radio transmitter

13. Radio receiver

14. Different types of Transmitters and Receivers Radio Frequency (RF) Chain Modulation Chain TRF Receiver Super heterodyne Receiver

15. TRF Receiver

16. Superheterodyne Receiver

17. Different component of a radio receiver

18. Uses of radio waves Here are some common uses 1 . Wireless technology 2. Mobile telephone communication 3 .television 4 .Radar 5 .radio waves in space 6 .WiFi And many ,many Others

19. Advantages It’s also a cheap form of communication and it travels through the air so no wires are needed. Radio communication can be possible where any satellite and cell phone service are not available.

20. Disadvantages It has low frequency so it can't transmit a lot of data one time. In this communication system we can’t transfer video or picture only voice signal can be transferred.

21. Future Technology for Radio Communication Cognitive Radio Networks Cognitive radios have the ability to monitor, sense, and detect the conditions of their operating environment. A  cognitive radio  is an intelligent  radio  that can be programmed and configured dynamically. Its transceiver is designed to use the best wireless channels .

22. Conclusion The radio communications has been used over a hundred years now . The uses of radio communication increasing day by day & its being used by a wide range of electronic sector. This technology is upgrading to give us better satisfaction

23. References [1 ] Microphone IMAGE. Posted by Tom (2007). Houston’s Clear Thinkers. Weblog [Online] August 22. Available from: http://blog.kir.com/archives/2007/08/sports_talk_rad.asp [Accessed 22/01/11] [ 2] National Astronauts and Space Administration. [Web Definition] [Accessed 22/01/11] Available form: http://science.hq.nasa.gov/kids/imagers/ems/radio.html [3] National Astronauts and Space Administration(2010). [Online Image] [Accessed 22/01/11] Available form: http://science.hq.nasa.gov/kids/imagers/ems/radio.html