RW Modulation Transmission Basics
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saavinabeygunawardena , electricity , communication , radio , signals , modulation , demodulation , propagation , wave
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The document summarizes the history and methodology of All India Radio (AIR), India's national public radio broadcaster. It traces AIR back to broadcasts started by the Radio Club of Bombay in 1923. Control passed to the government in 1930 and it was renamed All India Radio in 1936. The document also describes the basic principles and components of radio transmission and reception, as well as different types of microphones used in radio broadcasting.
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I m Pankaj singh. i have done my traing at AIR. This Presentation is all about ALL INDIA RADIO, Prasar Bharati. as there are now resources to get this ppt on net..i had to suffer a lot..so this is dedicated to all my friends who have done their training from AIR.
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1. A radio communication system consists of a microphone that converts sound waves to electrical signals, a modulator that modulates a carrier wave generated by an oscillator with the electrical signals, and an amplifier and broadcast antenna that transmit the modulated carrier wave as radio waves.
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1. A radio communication system consists of a microphone that converts sound waves to electrical signals, a modulator that modulates a carrier wave generated by an oscillator with the electrical signals, and an amplifier and broadcast antenna that transmit the modulated carrier wave as radio waves.
2. Modulation is necessary to transmit the electrical signals representing sound. It involves changing properties of the carrier wave, such as amplitude or frequency, in relation to the loudness, pitch, and other properties of the original sound.
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2. During a phone call, sound waves cause a metal disk in the transmitter to vibrate, transforming sound into an electronic signal. The receiver uses a speaker to transform the electronic signal back into sound.
3. Electromagnetic waves consist of changing electric and magnetic fields that can carry signals over long distances. A changing magnetic field produces a changing electric field and vice versa.
4. For radios, an audio signal is combined with a carrier wave and transmitted via electromagnetic waves to antennas. The radio separates the signal from the carrier wave. For TV, video and audio signals
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- The components and functions of a radio broadcasting studio, including mixing boards, recording rooms, and transmission equipment.
- Details about AIR's network today, which includes 149 MW transmitters, 54 SW transmitters, and 171 FM transmitters covering over 91% of India.
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A communications system allows for the transfer of information from an information source to an information sink. It consists of a transmitter that encodes a message from the information source into a transmitted signal, a channel to carry the signal, and a receiver to decode the signal back into a message for the information sink.
The transmitter may perform operations like modulation, amplification, and filtering on the message signal. The channel can be a wireline medium like coaxial cable or a wireless medium like free space. It is subject to degradation from noise, interference and distortion. The receiver performs complementary operations to the transmitter like demodulation, amplification and filtering to recover the original message from the received signal for the information sink.
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Radio broadcasting in India began in 1922 when the first license was granted. The government established the India State Broadcasting Service (ISBS) which later became All India Radio (AIR) in 1936. AIR today has a network of over 400 stations across the country. In the 1990s, private FM radio was introduced and has increased listenership. The document discusses the working of an FM transmitter which involves modulating a carrier wave with left and right audio signals using a stereo coder and VHF oscillator. It also describes some of the studios used for different types of radio programming at AIR Jodhpur such as drama, talk, music, and commercial broadcasting studios.
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Radio waves have been used for communication for over a hundred years. Guglielmo Marconi and Nikola Tesla are considered the fathers of radio communication, with Marconi transmitting the first radio signal across the Atlantic. A mobile phone network uses radio waves to transmit signals between phones and base stations, which are connected to the wired telephone network. When a call is made, the phone sends a radio signal to the nearest base station, which routes the call through telephone cables or additional radio links to other stations and ultimately the destination phone. Base stations provide radio coverage to a geographical cell, and cells overlap to ensure users remain in contact with a station.
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This document provides an overview of All India Radio (AIR) in Bhopal, including:
1. It describes the basic principles of how AIR transmits radio signals using modulation and broadcasting on different frequency bands like SW, MW, and FM.
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3. It explains the role of the control room audio console in receiving inputs from studios and transmitting outputs to transmitters, other stations, and more.
4. It provides details on the AM and FM transmitters used for transmission, including their configurations, common devices, and block diagrams.
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Radio waves are used to transmit signals between mobile phones and base stations. Mobile phones use radio frequencies between 872-960MHz and 1710-1875MHz to communicate with nearby base stations. Base stations are connected to each other and route calls as the caller moves between different cell sites, which provide radio coverage to a geographical area. The size of each cell depends on terrain, frequency band used, and needed call capacity in the area.
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Here are the answers to your questions:
1. The three main parts of a phone are the transmitter, receiver, and dialing mechanism.
2. During a phone call, sound waves cause a metal disk in the transmitter to vibrate, transforming sound into an electronic signal. The receiver uses a speaker to transform the electronic signal back into sound.
3. Electromagnetic waves consist of changing electric and magnetic fields that can carry signals over long distances. A changing magnetic field produces a changing electric field and vice versa.
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Radio waves are a type of electromagnetic radiation that transmit through free space by modulating electromagnetic waves with frequencies below light. They can range from 300GHz to 3kHz and travel at the speed of light. Radio waves are used for AM and FM radio, medical treatments like MRI, radio telescopes, mobile phones, wireless networks, radio and television broadcasting, and Wi-Fi networks. Mobile phones transmit to local cell sites to connect calls between cells as the phone moves. Television sends pictures via AM or FM and uses vestigial sideband modulation to reduce bandwidth for analog signals.
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Radio waves are a type of electromagnetic radiation that transmit through free space by modulating electromagnetic waves with frequencies below light. They can range from 300GHz to 3kHz and travel at the speed of light. Radio waves are used for AM and FM radio, medical treatments like MRI, radio telescopes, mobile phones, wireless networks, radio and television broadcasting, and Wi-Fi networks. Mobile phones transmit to local cell sites to connect calls between cells as the phone moves. Television sends pictures using AM modulation and sound using either AM or FM, while analog TV uses vestigial sideband modulation to reduce bandwidth.
Radio Waves
Radio waves are a type of electromagnetic radiation that transmit through free space by modulating electromagnetic waves with frequencies below light. They can range from 300GHz to 3kHz and travel at the speed of light. Radio waves are used for AM and FM radio, medical treatments like MRI, radio telescopes, mobile phones, wireless networks, radio and television broadcasting, and Wi-Fi networks. Mobile phones transmit to local cell sites to connect calls between cells as the phone moves. Television sends pictures via AM or FM and uses vestigial sideband modulation to reduce bandwidth for analog signals.
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This document provides information about radio broadcasting in India. It discusses:
- The history of radio broadcasting in India, beginning with the first broadcast license in 1922 and the establishment of the All India Radio network in 1936.
- The technical aspects of radio transmission, including how radio waves carry signals and how receivers convert those signals back into audio.
- The components and functions of a radio broadcasting studio, including mixing boards, recording rooms, and transmission equipment.
- Details about AIR's network today, which includes 149 MW transmitters, 54 SW transmitters, and 171 FM transmitters covering over 91% of India.
Radio communication and the mobile phone
Radio waves transmit various types of information such as music, conversations, pictures, and data over long distances. They are used not only for radio but also for other electronics like TVs, mobile phones, Bluetooth, and microwaves. Amplitude modulation is a technique used to transmit information via radio carrier waves by varying the strength of the transmitted signal based on the information being sent. Mobile phones use radio communication by transmitting and receiving radio frequency signals between the phone and nearby base stations, which are connected to each other and the telephone network to track calls and transfer them as users move between different coverage areas.
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Radio waves are used for various media technologies beyond radio broadcasting, including television, WiFi, and mobile phones. Television uses radio waves to transmit both audio and visual signals from a broadcast center to satellites and then to viewers' dishes and receivers. WiFi uses radio waves to allow wireless internet access without cables. Mobile phones use radio waves to communicate with the nearest cell tower, allowing calls, texts, and emails. These technologies have become essential to modern life and communication.
WIRELLESS CHARGING OF MOBILE PHONES
This document discusses wireless charging technology for mobile phones. It describes three methods of wireless charging - resonance charging, inductive charging, and radio charging. Inductive charging works by using electromagnetic induction to transfer energy between coils in the charging base and device. The document proposes using this principle to automatically charge phones as users talk, eliminating the need for separate chargers and wires. It presents the block diagram and advantages of the wireless charging system.
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Radio waves are electromagnetic waves that can range in length from millimeters to over 100,000 km, making them one of the largest types of waves. They are used to transmit signals for radio, television, mobile phones, and other technologies. Radio waves are transmitted through antennas and received by antennas, where a tuner selects the desired frequency. Mobile phones also emit low levels of radio frequency radiation when in use. Television has transitioned from using antennas to receive radio wave signals to digital transmission of signals through networks.
Radio waves used in media technology other than for radio broadcasting
Radio waves are used for various media technologies beyond radio broadcasting, including television, WiFi, and mobile phones. Television uses radio waves to transmit both audio and visual signals to receivers from broadcast centers via satellites. WiFi allows wireless internet access by transmitting data back and forth using radio waves between a router and devices. Mobile phones employ radio waves to enable communication networks by transmitting signals between phones and the nearest cell tower within a 5 mile range. These technologies have become essential to modern life and communication.
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- A basic communication system includes a source, transmitter to convert the signal to a transmission format, a channel with noise, a receiver to decode the signal, and a destination.
- Modulation involves varying properties of a carrier signal like amplitude, frequency, or phase to transmit a message signal over a channel.
- Common modulation techniques are amplitude modulation which varies signal strength, and frequency modulation which varies carrier frequency.
Unit 5.doc
This document provides an overview of telecommunication systems and communication engineering. It discusses analog and digital signals, the components of a basic communication system including the source, transmitter, channel, receiver and destination. It describes different types of modulation used in communication systems including amplitude modulation, frequency modulation, and pulse modulation. It also includes block diagrams of wireless communication systems and their components such as the transmitter, encoder, noisy channel, decoder and receiver.
Communication system
The process of communication and Basic Block Diagram of Communication system is presented in this PPT.
The various Blocks like Information Source, Transmitter, Communication Channel, Noise, Receiver and Destination Blocks are discussed in detail
Unit 1. chapter 2. presentation radio
This document discusses radio communication technologies. It explains that radio uses radio waves to communicate over long distances. It describes how modulation works by adding digital or analog sound waves to a carrier wave. It distinguishes between AM and FM modulation and their characteristics. The document also outlines the basic components and process of radio signal transmission from a transmitter to a receiver via antennas, including modulation, amplification and demodulation. It provides examples of radio stations in Madrid.
Radio wave
Radio uses radio waves to transmit information by modulating properties of electromagnetic waves like amplitude, frequency, and phase. Radio waves are a type of electromagnetic radiation with wavelengths longer than infrared light. A transmitter generates radio frequency alternating current to produce radio waves, while a radio receiver receives radio waves and converts the information to a usable form using an antenna. Frequency refers to the number of cycles per second in alternating current, and the electromagnetic spectrum includes all known frequencies and wavelengths of photons.
physics 2
The document discusses the flow of information through communication systems. It defines information and the flow of information as the transfer of data from one place to another using electronic and optical equipment. It provides examples of how information is sent through wires, radio waves, optical fibers, and other transmission mediums. The key elements of a communication system are the transmitter, transmission channel, and receiver. The transmitter processes the input signal, the transmission channel sends the signal through a medium like wires or radio waves, and the receiver processes the output signal and delivers it to the destination. It then focuses on how electrical signals are transmitted through telephone wires by converting sound vibrations into electrical signals at the transmitter and back into sound waves at the receiver.
Physics 1
The document discusses the flow of information through communication systems. It defines information and the flow of information as the transfer of data from one place to another using electronic and optical equipment. It provides examples of how information is sent through wires, radio waves, optical fibers, and other transmission mediums. The key elements of a communication system are the transmitter, transmission channel, and receiver. The transmitter processes the input signal, the transmission channel sends the signal through a medium like wires or radio waves, and the receiver processes the output signal and delivers it to the destination. Specific examples discussed include how telephone systems work by converting sound vibrations to electrical signals that are transmitted through wires and then back to sound vibrations at the receiving end.
lecture15.ppt
This lecture discusses communication systems and modulation techniques. It introduces analog modulation methods like amplitude modulation (AM) and frequency modulation (FM) as well as digital modulation techniques including amplitude shift keying (ASK), frequency shift keying (FSK), and phase shift keying (PSK). It also discusses modems, which are devices that modulate and demodulate signals to transmit digital data over analog channels like telephone lines. Common modem types include internal, external, DSL, and cable modems.
lecture15.ppt
This lecture discusses communication systems and modulation techniques. It introduces analog modulation methods like amplitude modulation (AM) and frequency modulation (FM) as well as digital modulation techniques including amplitude shift keying (ASK), frequency shift keying (FSK), and phase shift keying (PSK). Modems are also introduced as devices that modulate and demodulate signals to transmit digital data over analog networks like telephone lines.
Chapter01.ppt
This document provides an introduction to a communication systems course. It outlines the course structure, assessments, references, and teaching staff. It also summarizes key topics that will be covered in Chapter 1, including the components and types of communication systems, modulation, multiplexing, the electromagnetic spectrum, and bandwidth. The chapter topics focus on defining communication systems, describing analog and digital signals, and explaining common modulation techniques.
RADIO ENGINEERING Week 2 Lecture 2 Understand the basics radio communication
This document discusses the basic components of a radio communication system. It explains that a communication system exchanges information between two points by transmitting and receiving messages. The three main components are the transmitter, which modulates the message signal; the channel, which connects the transmitter to the receiver; and the receiver, which demodulates the received signal to reproduce the original message. The document also categorizes communication systems as either wired or wireless depending on the type of transmission channel used.
Fm receiver
The document describes an FM receiver project. It includes the group members, an overview of radio receivers and how they work, classifications of receivers, details on AM and FM receivers, the circuit diagram and components of the FM receiver, and descriptions of the main sections in the block diagram including the RF amplifier, mixer, filter, IF amplifier, limiter, demodulator, AF amplifier, and oscillator.
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RW Modulation Transmission Basics
- 1. Radio Communication By Saavin Abeygunawardena Electronic and Electrical Engineering MEng Module: Design and Professional Skills
- 2. Outline Importance of Radio Communication What is Modulation? What is transmission? What is Demodulation? SUMMARY BIBLIOGRAPHY Fig2: 3 Main elements of radio communication Fig1: Novice Station www.arrl.com
- 3. Radio Communication Purpose: transmission of data from 1 place to another through air without wires How it Works? Transmitter: Consists of modulator that constructs waveform before transmission Channel: Particular range of frequency spectrum through which communication occurs Receiver: Consists of Demodulator that recovers message from received signal History? 1887: Hertz demonstrated waves carrying energy could be transmitted through air 1895: Guglilmo Marconi successfully sent and received radio signal in Italy
- 4. Sound to Electrical Signal Conversion Audio Information Broadcastig Sound transmitted 1st converted into varying electrical current with microphone Microphone: device for the pick up and conversion of sound waves into electrical signal 1. sound waves created by voice carry energy towards microphone 2. Sound waves hit diaphragm and forces it forwards and backwards 3. Coil attached to diaphragm forced forward and backward at the same time 4. The amount of magnetic field cut by coil changes 5. According to Faraday’s Law of EM Induction Electrical current forms in the coil 6. Sound has been converted into signal in the form of electrical current Fig1: Diagram shows how sound converted into electrical signal using microphone using piezoelectric technique.
- 5. What is Modulation? Modulation: signal to be broadcasted is combined with the carrier wave Carrier Wave: Radio wave required to send electrical signal obtained from microphone over air Also Known as RF Wave Properties: Very high frequency Higher Frequency than microphone information signal Produced from Transistorised Oscillator Main Types of Modulation: FM, AM
- 6. Transmitter and Receiver Antenna Transmitter: Radio waves are radiated from transmitter Radio waves are produced by electronic circuit called High Frequency Oscillator Receiver: Carrier wave is picked up by the antenna of the receiver Radio waves are detected by resonator circuit in receiver antenna which resonates only at the same frequency of radio wave being broadcasted and Designed to limit the effects of noise on the recovered information Fig1: Types of radio wave propagation methods and antennas used for transmitting and receiving radio waves
- 7. What is Demodulation? Demodulation is the process by which audio information is separated from the modulated carrier wave Demodulator : Electronic circuit used to recover the information from the modulated carrier wave When Audio signal passes through a suitable speaker the original sound is produced. Fig1: Electronic Circuit design for demodulated signal
- 8. Bibliography Fundamentals of Electrical Engineering and Electronics • B.L Theraja Hughes Electrical and Electronic Technology - 10th Edition • John Hiley, Keith Brown http://www.infoplease.com/encyclopedia/science/radio-uses-radio- waves.html http://www.infoplease.com/encyclopedia/science/radio-uses-radio- waves.html
Editor's Notes
- Radio broadcasting has made huge impact on our lives broadcasting is used in mobile phone voice communication Radio broadcasting was first successfully achieved by Tesla Radio broadcasting has 4 main stages: Transmission, Filtering, Demodulation Radio broadcasting first worked with analag data Recent developments have allowed