Means of Communication Purpose Audience Telegram To send messages quickly and easy through telegraphs. People Letter Writing To communicate with family‚ friends‚ send a document‚ etc. Used for private communication. People Radio To let people know what is going on in the world. Used for mass communication. People Newspaper To let people catch up on current events around the world and in people’s local communities. Used for mass communication. People Telephones To communicate by voice to one another
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from true form. Again‚ it is important to understand that realism (naturalism) was created to show life in its purist form. Art made for the common man. In the early 1920’s after World War I had ended and in the same era as the first commercial radio broadcast‚ A very different display of art was on the horizon‚ Surrealism. Surrealism is best proclaimed for its writings and visual arts. The image artist were in interest of displaying was a dream state of reality. Artist painted unnerving‚ illogical
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We use the radio portion of the electromagnetic spectrum for many things‚ including television and radio broadcasting‚ telephones and other wireless communications‚ navigation and radar for a variety of measurements including police speed traps‚ and even microwave cooking ovens. 2 Objective After reading this unit‚ you should be able to understand: • Microwave Frequencies • Microwave link Properties • Microwave radio relay • Different Digital radio systems 3 Classification
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public. It is therefore free from political influence and commercial pressure. (UNESCO) A “Public Broadcaster Services” (“PBS”) has the role of broadcasting in the interest of the public. The SABC in South Africa owns fifteen PBS radio stations of which eleven of its PBS radio stations broadcast in each of the eleven official languages. Along with serving the interest of the public by educating and informing them‚ the SABC is also associated with the task of national unity and reconciliation. Therefore
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Uses and Abuses of Media Imagine a city without televisions‚ radios or Internet connections. All these media facilities provide people awareness of what is going on around them. Electronic as well as Print Media is an effective way of communication as it provides link between ordinary persons and others in the world. It is only due to newspapers that we can read in the morning about the events that took place on the other side of the world only the day before. Besides‚ electronic media can telecast
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and unguided media 2.What are three important characteristics of a periodic signal 3.Define funamental frequency 4.What is attenuation? 5.Describe the components of optical fiber cable. 6.Indicate some significant differences between broadcast radio and microwave. 7.What is the difference between diffraction and scattering? 8.List and briefly define important factors that can be used in evaluating or comparing the various digitial-to-digital encoding techniques. 9.What function doeas a modem
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telephone calls over a radio link over a wide geographical area.It does this by connecting to a cellular network provided by a mobile Phone operator like MTN‚CellZ and Airtel in Zambia.A mobile phone can also connect to a public telephone network i.e Land line.In Zambia‚Zamtel provides Land line telephone services. In the early days‚communication of speech by radio link was mainly used by the Military using hand and held radio transceivers.These were also used for transmiting radio waves from land to
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discovers radio waves. Marchese Guglielmo Marconi demonstrates wireless radio wave propagation. 3) 1865: 1866: 1876: 1877: 1880: 1887: Prepared By : Raniel P. Babon 1 BOOK REVIEW IN COMMUNICATIONS Electronic Communications System By Wayne Tomasi 1888: Heinrich Hertz detects and produces radio waves. Heinrich Hertz conclusively proved Maxwell’s prediction that electricity can travel in waves through the Earth’s atmosphere. Marchese Guglielmo Marconi builds his first radio equipment
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SEPTEMBER 1967 1 $250 KOM lt1751A "ITS WHATS INSIDE THAT COUNTS. r an I I Superb Frequency Stability Continuous Duty Operation Crystal Clear Signal Quality Midsize Masterpiece! The deluxe IC-751A includes more high performance features and professional circuitry per cubic inch than any other HF transceiver. Its smooth-assilk operation and long-term reliability produce the ideal contesting. DX’ing‚ mobiling and portable rig. Owning an IC-75 1A truly means "Going First Class!" Unsurpassed
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CONCEPT OF WIRELESS ELECTRICITY (Wi-Tricity) Our forefathers marveled at the invention of glowing light bulbs by Thomas Edison in 1879. However‚ to us 21st centurions‚ the light bulb is nothing out of the ordinary. When computers‚ cell phones‚ laptops‚ iPods‚ etc. were invented our antennas tweaked. Now this is what you call invention! However‚ as time’s progressing we are getting used to these devices. In fact‚ charging all these appliances has become so very cumbersome. Each appliance has its
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