How are radio waves transmitted from a radio station?
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Every station has a transmitter that radiates radio signals around its area. A lot of the signals reflect off the atmosphere, and this along with the power of the transmitter determines how much area the signal covers.\n\nHow the transmitter sends out a radio signal?\n\nThere's an excellent in-depth discussion on Wikipedia (the link I provide), but I copy here the one important point:\n\n"In principle any conductor (wire) carrying an alternating current will radiate a radio signal. Thus a basic transmitter is just an oscillator connected directly to a wire antenna."\n\nSo you need a conductor with an alternating current going through it. This will send out radio waves. Of course, its more complex if you want the radio signal to contain a voice or song broadcast of course.\n\nRemember that a radio wave is just another type of electromagnetic radiation, along with xrays, and light. The only thing that seperates light and radio is the wavelength (def: every oscillating electromagnetic signal has a property that specifies the distance from one peak of the signal to the next) of the radiation. \n\nOur eyes are basically receivers that can interpret electromagnetic radiation within a certain range. So think of radios as a type of artificial eye that reacts to radio signals, and that a radio station is basically one huge flashlight.\n\nThat's as simple an analogy I can make.
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call your local stations and see if they know\nthank you
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Oscillation and Modulation of waves produces FM Radio waves. Here is a site which has some good and simple circuits. But remember Transmitting Radio Waves without a license is illegal in most countries..
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The RF waves emanating from an antenna are generated by the movement of electrical charges in the antenna. Electromagnetic waves can be characterized by a wavelength and a frequency. The wavelength is the distance covered by one complete cycle of the electromagnetic wave, while the frequency is the number of electromagnetic waves passing a given point in one second. The frequency of an RF signal is usually expressed in terms of a unit called the "hertz" (abbreviated "Hz"). One Hz equals one cycle per second. One megahertz ("MHz") equals one million cycles per second.
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High frequency radio waves. Around 1700 Mhz.
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It depends on the type of system.  You have point to point, which is direct communications betweent two radio stations.  You have repeater operation, which allows two or more radio stations to communicate with each other through a third system, which relays transmissions over a single frequency pair.\n\nYou have conventional repeaters, or trunked repeaters.  Conventional systems work as mentioned above.  Trunked systems utilize several frequencies, controlled by computer.  Frequency pairs are assigned on a first come basis, and are rotated among all the radios on a system.\n\nRadio is not transmitted through a satellite, unless it *is* satellite radio.  Radio systems operate via a ground antenna system.
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As Lyndsey stated, you listen to radio stations if you are connected to the Internet. You may have to download software, such as RealOne, Yahoo!Music, or Quicktime to access.\n\nIf you listen to a certain station, go to their website and look for the link to listen online.\n\nIf you have a slow connection, the streaming will be slower and their will be delays in listening to the music/news.
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A simple radio system is the superhetrodyne receiver system.\nHetrodyning is the process of shifting in the frequency domiain.\nThe elements for transmission are signal source (microphone), Amplifier, Modulator, RF oscillator, RF Mixer, RF amplifier, Antenna.  \nThe elements for receiving are Antenna, RF Amplifier, Local Oscillator, RF Mixer, Filter, IF Amplifier, Demodulator, Amplifier, Speaker.
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Basic information used in AM is amplitude: that's the size from top to crest of the electromagnetic wave used to carry signal from the radio station to your receiver set. This amplitude varies  according to sound. \nIn FM it's the frequency : that's the degree to which waves in the electromagnetic wave  are compressed together. for example, tighly compressed wave represent a high pitch (violin) , low compress a bass sound...\nEither are used as coding techniques to get the signal into a wave sent from emitter to receiver in communications
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Different reasons -- \n\n1.  Frequency separation.  Radio stations operate on different channels (frequencies) than CB radios for example.\n\n2.  Different locations.  You can operate on the same frequencies if the transmitters are located far enough away from each other.  Look how many "Channel 3" TV stations there are.  They're far enough away from each other so they don't interfere.\n\n3.  Different modulation.  FM and AM are types of modulation.  In the case of radio, they're also on different spectrums, but you could have the same frequency modulated differently and have minimal interference.\n\n4.  Digital transmission.  You can transmit information digitally over the airwaves and "multiplex" it such that it doesn't interfere with other transmissions (cell phones for example).
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To receive an FM radio station on your computer, you would need a piece of hardware that can receive radio broadcasts. Many stations now broadcast over the internet, so you can receive a live feed from their website. Or you could sign up for XM radio online. It's not FM, but its way better.
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FM = frequency modulation.\n\nAM = amplitude modulation.\n\nwavelengths of AM radio are much larger than FM waves, which is why they are measure in kHz (compared to the MHz of FM). This is why AM radio signals are able to travel so much farther than FM signals. \n\nSince FM signals have much shorter wavelengths (and thus higher frequencies), the tuning needs to be more precise to pick up the desired signal, which is why an antenna is usually necessary.
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A small device, called "peoplemeter" is assembled in every radio and TV set. This is standard equipment of every set, since early 90's. That device sends back the informations thru the aerial, which frequency is preffered at that moment on that TV or radio set. Informations are gathered in all radio and TV stations, and analysed, in order to get information which channel is the most preferred at this very moment. Thus the number of viewers and listeners is obtained.
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Like light rays radio waves are reflected refracted and diffracted and absorbed by materials. At certain angle of reflection radio waves are also polarized.\n\nSince it is an E.M wave it travels in vacuum or air with velocity C.\n\nThey are reflected by metals, but absorbed by many substances like wall. The absorption depends upon the thickness of the material.Usually the thicknes of a wall is such as to absorb radio waves. \n\nBecause of long wavelength it can bend across obstacles, and even small cleavage in a wall can fill a room with radio waves.
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the phenomenon is called electgromagnetic induction. The incoming signal induces electric current of variying strength in the antenna which is used by the receiving device.
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I'll picture it for you...years ago when all the radios were AM Amplitude Modulation...when you drove under high voltage power-lines..you would hear static...with FM Frequency Modulation this will not happen..Higher Frequency.\n\nI hope this helped
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You can set the band of your radio to SW or short wave. Start tuning. You will get many international channels. The clarity will be poor though. Satellite radio is the best.