logging in or signing up Radio Communications Principles and Applications ihameed Download Post to : URL : Related Presentations : Let's Connect Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Copy embed code: Embed: Flash iPad Dynamic Copy Does not support media & animations Automatically changes to Flash or non-Flash embed WordPress Embed Customize Embed URL: Copy Thumbnail: Copy The presentation is successfully added In Your Favorites. Views: 1141 Category: Science & Tech.. License: Some Rights Reserved Like it (1) Dislike it (0) Added: August 20, 2010 This Presentation is Public Favorites: 0 Presentation Description No description available. Comments Posting comment... By: Robint (42 month(s) ago) Thank you for your nice presentation do you have one on antenas Saving..... Post Reply Close Saving..... Edit Comment Close By: akbarpasha.shaik (44 month(s) ago) Thanks a lot sir for this share Saving..... Post Reply Close Saving..... 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Edit Comment Close Premium member Presentation Transcript Radio Communications Principles and Applications : 20/08/2010 1 by Imran Hameed Radio Communications Principles and Applications Aim of Today’s Lesson : 20/08/2010 2 Aim of Today’s Lesson Develop an understanding of electromagnetic waves used for radio communication and the factors that affect reliable communication Objectives of Today's Lesson : 20/08/2010 3 Objectives of Today's Lesson Review The electromagnetic spectrum Characteristics of electromagnetic waves Polarisation Frequency, wavelength and velocity of propagation Modes of propagation Effect of Ionosphere Operation of antennas Common Uses of Radio : 20/08/2010 4 Common Uses of Radio 5 mins List 10 everyday uses of radio Common Uses of Radio… : 20/08/2010 5 Common Uses of Radio… I.D. Badge Tags SW Radio Broadcast Radio TV Model RC Intercom Microwave oven HF Asset tracking UHF Truck/Trailer ID Car door keys Garage door opener Bluetooth G P S Toll road tags Vehicle speed check Cordless phone Satellite TV Mike & Amps Emergency services WiFi Radio Frequency Spectrum : 20/08/2010 6 Radio Frequency Spectrum 5 mins Work in Pairs Radio Frequency Classification : 20/08/2010 7 Radio Frequency Classification ULF 300Hz – 3kHz VLF 3 – 30 kHz LF 30 – 300kHz MF 300 – 3,000kHz (3 MHz) HF 3 – 30MHz VHF 30 – 300MHz UHF 300 – 3,000 MHz (3GHz) SHF 3 – 30 GHz EHF 30 – 300 GHZ Radio Frequency Spectrum : 20/08/2010 8 Radio Frequency Spectrum Electromagnetic Spectrum : 20/08/2010 9 Electromagnetic Spectrum Managed by a number of bodies: Radio Communications Agency (UK) ITU – International Telecommunication Union ETSI European Telecommunications Standards Institute Stops user conflict Preserves user integrity Slide 10: 20/08/2010 10 Periodic Signals : 20/08/2010 11 Periodic Signals Sine Wave : 20/08/2010 12 Sine Wave Peak Amplitude (A) maximum strength of signal volts Frequency (f) Rate of change of signal Hertz (Hz) or cycles per second Period = time for one repetition (T) T = 1/f Phase () Relative position in time Slide 13: 20/08/2010 13 Slide 14: 20/08/2010 14 Practice Exercise : 20/08/2010 15 Practice Exercise Draw the Sine waves with following data: A = 2 , F = 2 and = 0 A = 2.5 , F = 3 and = 180 degrees Wavelength() : 20/08/2010 16 Wavelength() Distance occupied by one cycle Distance between two points of corresponding phase in two consecutive cycles Assuming signal velocity v = vT f = v c = 3*108 ms-1 (speed of light in free space) Practice Questions. . . : 20/08/2010 17 Practice Questions. . . Radio wave has 30m wavelength & 10MHz frequency What is it’s Velocity? Radio wave has 12.3m Wavelength and 3 x10^8 m/sec What is it’s frequency? Solution : 20/08/2010 18 Solution A1. V = Freq x Wavelength So V = 10x10^6 x 30m = 3x 10^8metres / sec A2. Freq = Velocity / Wavelength = (3 x 10^8 cps) / 12.3m = 24.39 MHz Group Activity : 20/08/2010 19 Group Activity Time: 20 – 30 mins Group size: 4 Research the topic given and prepare a brief presentation. (10 mins) Presentations (20 mins) What We have achieved…. : 20/08/2010 20 What We have achieved…. Electromagnetic Spectrum Classification of Frequency bands Characteristics of bands between 3KHz to 90 GHz Relationship between frequency, wavelength and velocity of propagation Break (15 mins) : 20/08/2010 21 Break (15 mins) Antennae : 20/08/2010 22 Antennae Antenna : 20/08/2010 23 Antenna is an electrical conductor or system of conductors. is a device whose function is to radiate electromagnetic energy or to intercept electromagnetic radiation Transmission - radiates electromagnetic energy into space Reception - collects electromagnetic energy from space Group Activity : 20/08/2010 24 Group Activity Time - 30 mins Group Size – 5 Topics: Antenna Radiations Electric and magnetic field Planes of Polarization Sinusoidal waveforms Gain & Front to back ratio Types of Antenna Unipole Monopole Dipole Yogi array Review and Feedback : 20/08/2010 25 Review and Feedback You do not have the permission to view this presentation. In order to view it, please contact the author of the presentation.