Radio Waves :: essays research papers

Before beginning our researchon radio waves, to us, radio waves were justwaves pass through the aureole, carryingsound from one place to another. Those were ourignorant days We did not realize the complicatedterms and theories involved. In the followingreport you will front how we advanced in ourknowledge of radio waves, and we hope it will dothe same for you. Radio waves be a combinationof two kinds of electric vibrations. straitfrequency waves, which represent voice and othersounds and radio frequency waves, which carryaudio waves after being combined with them. Twoexamples of broadcast waves are AM waves andFM waves. AM which stands for amplitudemodulation, is a broadcasting method in which thecarrier waves (carry the sounds of a program) arechanged to match changes in the audio frequencywaves. These are electric waves that represent thesounds of a radio broadcast. FM stands forfrequency modulation and these waves, that goskyward, are not reflected. Instead, they passthrough the atmosphere and go into space. AMsignals, however, reflect off the atmosphere andtravel back down to earth, causing broadcasts tobe received at a much greater distance than FMsignals. Since FM travels all the way to space andit does not bounce off the ground it does notcreate as much static as AM does. Radio waves,which travel at the speed of light, cannot be seen,heard, or felt in any way. When you listen to theradio, contrary to what some think, you arehearing the receivers clop up the waves and turnthem into sound. Three more types of radio wavesare ground waves, ionospheric waves andtropospheric waves. Ground waves travel fromthe antenna along the surface of the earth.Ionospheric waves, otherwise known as skywaves, are made up of radio waves that comefrom a transmitting antenna and go into the sky.The ionosphere is the region of the rare field andionized atmosphere around the earth, from 50 to200 miles. Last but not least are the troposphericwaves. These waves are parts of the original wavewhich is reflected into the troposphere, an area ofclouds and storms from 3 to 7 miles high. Radioschange sound into electrical patterns with vectors. In a radio transmitter, the circuit thatgenerates the high frequency AC current thatproduces radio waves from an antenna, is calledan oscillator. Electrical patterns are indeed changedinto broadcast waves of electromagnetic energy.The Kenelly-Heairside layer, found in atransmission of a radio is now well known. Thiskeeps the energy spent by a shortwave transmitterfrom escaping into space. This is why we are able